v3.26.1
Investment Securities - Schedule of Available-for-sale Investment Securities Portfolios (Details) - USD ($)
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Available-for-sale securities      
Continuous unrealized losses existing for less than 12 months, fair value $ 4,248,899,000    
Continuous unrealized losses existing for less than 12 months, unrealized losses (59,970,000)    
Continuous unrealized losses existing for greater than 12 months, fair value 2,350,010,000    
Continuous unrealized losses existing for greater than 12 months, unrealized losses (432,981,000)    
Total, fair value 6,598,909,000    
Total, unrealized losses (492,951,000)    
Available-for-sale securities, at fair value 7,587,545,000 $ 6,236,263,000 $ 4,885,715,000
U.S. government agencies      
Available-for-sale securities      
Continuous unrealized losses existing for less than 12 months, fair value 0    
Continuous unrealized losses existing for less than 12 months, unrealized losses 0    
Continuous unrealized losses existing for greater than 12 months, fair value 46,502,000    
Continuous unrealized losses existing for greater than 12 months, unrealized losses (3,498,000)    
Total, fair value 46,502,000    
Total, unrealized losses (3,498,000)    
Available-for-sale securities, at fair value 46,502,000 47,471,000 45,824,000
Municipal      
Available-for-sale securities      
Continuous unrealized losses existing for less than 12 months, fair value 61,216,000    
Continuous unrealized losses existing for less than 12 months, unrealized losses (362,000)    
Continuous unrealized losses existing for greater than 12 months, fair value 25,384,000    
Continuous unrealized losses existing for greater than 12 months, unrealized losses (1,524,000)    
Total, fair value 86,600,000    
Total, unrealized losses (1,886,000)    
Available-for-sale securities, at fair value 171,148,000 162,166,000 180,644,000
Financial issuers      
Available-for-sale securities      
Continuous unrealized losses existing for less than 12 months, fair value 0    
Continuous unrealized losses existing for less than 12 months, unrealized losses 0    
Continuous unrealized losses existing for greater than 12 months, fair value 73,027,000    
Continuous unrealized losses existing for greater than 12 months, unrealized losses (1,973,000)    
Total, fair value 73,027,000    
Total, unrealized losses (1,973,000)    
Available-for-sale securities, at fair value 73,027,000 76,296,000 78,801,000
Residential mortgage-backed securities      
Available-for-sale securities      
Continuous unrealized losses existing for less than 12 months, fair value 3,329,857,000    
Continuous unrealized losses existing for less than 12 months, unrealized losses (47,898,000)    
Continuous unrealized losses existing for greater than 12 months, fair value 2,042,063,000    
Continuous unrealized losses existing for greater than 12 months, unrealized losses (406,333,000)    
Total, fair value 5,371,920,000    
Total, unrealized losses (454,231,000)    
Available-for-sale securities, at fair value 6,158,269,000 5,156,683,000 4,143,684,000
Commercial (multi-family) mortgage-backed securities      
Available-for-sale securities      
Continuous unrealized losses existing for less than 12 months, fair value 232,076,000    
Continuous unrealized losses existing for less than 12 months, unrealized losses (5,790,000)    
Continuous unrealized losses existing for greater than 12 months, fair value 97,055,000    
Continuous unrealized losses existing for greater than 12 months, unrealized losses (4,684,000)    
Total, fair value 329,131,000    
Total, unrealized losses (10,474,000)    
Available-for-sale securities, at fair value 333,989,000 276,553,000 126,945,000
Collateralized mortgage obligations      
Available-for-sale securities      
Continuous unrealized losses existing for less than 12 months, fair value 625,750,000    
Continuous unrealized losses existing for less than 12 months, unrealized losses (5,920,000)    
Continuous unrealized losses existing for greater than 12 months, fair value 65,979,000    
Continuous unrealized losses existing for greater than 12 months, unrealized losses (14,969,000)    
Total, fair value 691,729,000    
Total, unrealized losses (20,889,000)    
Available-for-sale securities, at fair value 798,587,000 509,060,000 295,801,000
Mortgage-backed securities, subprime      
Available-for-sale securities      
Available-for-sale securities, at fair value $ 0 $ 0 $ 0