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Securities - Securities with gross unrealized losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More $ 375,507 $ 420,143
Securities Held to Maturity, Fair Value    
Twelve Months or More 1,820,473 1,834,527
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 3,032 2,594
Twelve Months or More 515,042 806,730
Securities Available for Sale, Fair Value    
Less Than Twelve Months 1,394,582 93,830
Twelve Months or More 2,753,248 4,113,658
U.S. Treasuries    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 1  
Securities Available for Sale, Fair Value    
Less Than Twelve Months 18,294  
U.S. Government agencies    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 20,361 23,498
Securities Held to Maturity, Fair Value    
Twelve Months or More 112,547 123,774
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 214,924 241,204
Securities Held to Maturity, Fair Value    
Twelve Months or More 1,047,852 1,056,339
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 1,037 294
Twelve Months or More 168,622 282,129
Securities Available for Sale, Fair Value    
Less Than Twelve Months 158,905 14,341
Twelve Months or More 863,252 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 63,798 72,057
Securities Held to Maturity, Fair Value    
Twelve Months or More 341,205 339,664
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 1,294  
Twelve Months or More 56,462 98,212
Securities Available for Sale, Fair Value    
Less Than Twelve Months 908,932  
Twelve Months or More 318,887 454,908
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 66,345 72,391
Securities Held to Maturity, Fair Value    
Twelve Months or More 279,738 275,947
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 224 792
Twelve Months or More 84,022 193,788
Securities Available for Sale, Fair Value    
Less Than Twelve Months 26,921 53,342
Twelve Months or More 417,171 918,338
State and municipal obligations    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 100 1,484
Twelve Months or More 175,164 170,125
Securities Available for Sale, Fair Value    
Less Than Twelve Months 3,487 19,400
Twelve Months or More 899,151 923,431
Small Business Administration loan-backed securities    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 10,079 10,993
Securities Held to Maturity, Fair Value    
Twelve Months or More 39,131 38,803
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 376 24
Twelve Months or More 29,264 41,697
Securities Available for Sale, Fair Value    
Less Than Twelve Months 278,043 6,747
Twelve Months or More 227,796 289,786
Corporate securities    
Securities Available for Sale, Gross Unrealized Losses    
Twelve Months or More 1,508 1,990
Securities Available for Sale, Fair Value    
Twelve Months or More $ 26,991 $ 26,509