v3.25.2
Investment Securities - Schedule of Available-for-sale Investment Securities Portfolios (Details) - USD ($)
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Available-for-sale securities      
Continuous unrealized losses existing for less than 12 months, fair value $ 1,176,440,000    
Continuous unrealized losses existing for less than 12 months, unrealized losses (16,863,000)    
Continuous unrealized losses existing for greater than 12 months, fair value 2,424,427,000    
Continuous unrealized losses existing for greater than 12 months, unrealized losses (493,712,000)    
Total, fair value 3,600,867,000    
Total, unrealized losses (510,575,000)    
Available-for-sale securities, at fair value 4,885,715,000 $ 4,141,482,000 $ 4,329,957,000
U.S. Treasury      
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 0    
Continuous unrealized losses existing for greater than 12 months, unrealized losses 0    
Total, fair value 0    
Total, unrealized losses 0    
Available-for-sale securities, at fair value 13,018,000 37,907,000 102,712,000
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 45,824,000    
Continuous unrealized losses existing for greater than 12 months, unrealized losses (4,176,000)    
Total, fair value 45,824,000    
Total, unrealized losses (4,176,000)    
Available-for-sale securities, at fair value 45,824,000 44,945,000 45,192,000
Municipal      
Available-for-sale securities      
Continuous unrealized losses existing for less than 12 months, fair value 46,160,000    
Continuous unrealized losses existing for less than 12 months, unrealized losses (720,000)    
Continuous unrealized losses existing for greater than 12 months, fair value 50,763,000    
Continuous unrealized losses existing for greater than 12 months, unrealized losses (2,517,000)    
Total, fair value 96,923,000    
Total, unrealized losses (3,237,000)    
Available-for-sale securities, at fair value 180,644,000 184,593,000 146,608,000
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 78,801,000    
Continuous unrealized losses existing for greater than 12 months, unrealized losses (3,199,000)    
Total, fair value 78,801,000    
Total, unrealized losses (3,199,000)    
Available-for-sale securities, at fair value 78,801,000 80,169,000 76,985,000
Other      
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 998,000    
Continuous unrealized losses existing for greater than 12 months, unrealized losses (2,000)    
Total, fair value 998,000    
Total, unrealized losses (2,000)    
Available-for-sale securities, at fair value 998,000 993,000 990,000
Residential mortgage-backed securities      
Available-for-sale securities      
Continuous unrealized losses existing for less than 12 months, fair value 1,037,618,000    
Continuous unrealized losses existing for less than 12 months, unrealized losses (12,905,000)    
Continuous unrealized losses existing for greater than 12 months, fair value 2,177,836,000    
Continuous unrealized losses existing for greater than 12 months, unrealized losses (465,863,000)    
Total, fair value 3,215,454,000    
Total, unrealized losses (478,768,000)    
Available-for-sale securities, at fair value 4,143,684,000 3,553,638,000 3,778,834,000
Commercial (multi-family) mortgage-backed securities      
Available-for-sale securities      
Continuous unrealized losses existing for less than 12 months, fair value 92,662,000    
Continuous unrealized losses existing for less than 12 months, unrealized losses (3,238,000)    
Continuous unrealized losses existing for greater than 12 months, fair value 6,107,000    
Continuous unrealized losses existing for greater than 12 months, unrealized losses (396,000)    
Total, fair value 98,769,000    
Total, unrealized losses (3,634,000)    
Available-for-sale securities, at fair value 126,945,000 18,332,000 17,478,000
Collateralized mortgage obligations      
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 64,098,000    
Continuous unrealized losses existing for greater than 12 months, unrealized losses (17,559,000)    
Total, fair value 64,098,000    
Total, unrealized losses (17,559,000)    
Available-for-sale securities, at fair value 295,801,000 220,905,000 161,158,000
Mortgage-backed securities, subprime      
Available-for-sale securities      
Available-for-sale securities, at fair value $ 0 $ 0 $ 0