v3.25.2
Investment Securities - Securities with gross unrealized losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More $ 364,243 $ 420,143
Securities Held to Maturity, Fair Value    
Twelve Months or More 1,781,748 1,834,527
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 3,487 2,594
Twelve Months or More 517,629 806,730
Securities Available for Sale, Fair Value    
Less Than Twelve Months 662,372 93,830
Twelve Months or More 2,687,664 4,113,658
U.S. Government agencies    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 19,050 23,498
Securities Held to Maturity, Fair Value    
Twelve Months or More 113,860 123,774
Securities Available for Sale, Gross Unrealized Losses    
Twelve Months or More   18,789
Securities Available for Sale, Fair Value    
Twelve Months or More   150,418
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 209,197 241,204
Securities Held to Maturity, Fair Value    
Twelve Months or More 1,016,900 1,056,339
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 1,267 294
Twelve Months or More 166,010 282,129
Securities Available for Sale, Fair Value    
Less Than Twelve Months 96,348 14,341
Twelve Months or More 838,193 1,350,268
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 62,090 72,057
Securities Held to Maturity, Fair Value    
Twelve Months or More 333,259 339,664
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 1,627  
Twelve Months or More 54,181 98,212
Securities Available for Sale, Fair Value    
Less Than Twelve Months 398,768  
Twelve Months or More 308,971 454,908
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 64,067 72,391
Securities Held to Maturity, Fair Value    
Twelve Months or More 279,886 275,947
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 135 792
Twelve Months or More 81,585 193,788
Securities Available for Sale, Fair Value    
Less Than Twelve Months 39,092 53,342
Twelve Months or More 414,247 918,338
State and municipal obligations    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 315 1,484
Twelve Months or More 185,899 170,125
Securities Available for Sale, Fair Value    
Less Than Twelve Months 6,672 19,400
Twelve Months or More 881,624 923,431
Small Business Administration loan-backed securities    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 9,839 10,993
Securities Held to Maturity, Fair Value    
Twelve Months or More 37,843 38,803
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 143 24
Twelve Months or More 28,049 41,697
Securities Available for Sale, Fair Value    
Less Than Twelve Months 121,492 6,747
Twelve Months or More 218,036 289,786
Corporate securities    
Securities Available for Sale, Gross Unrealized Losses    
Twelve Months or More 1,905 1,990
Securities Available for Sale, Fair Value    
Twelve Months or More $ 26,593 $ 26,509