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Securities - Securities with gross unrealized losses (Details)
$ in Thousands
Dec. 31, 2024
USD ($)
item
Dec. 31, 2023
USD ($)
Investment Securities    
Number of securities with gross unrealized loss | item 1,214  
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More $ 420,143 $ 402,704
Securities Held to Maturity, Fair Value    
Twelve Months or More 1,834,527 2,084,737
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 2,594 536
Twelve Months or More 806,730 777,980
Securities Available for Sale, Fair Value    
Less Than Twelve Months 93,830 66,584
Twelve Months or More 4,113,658 4,618,627
U.S. Treasuries    
Securities Available for Sale, Gross Unrealized Losses    
Twelve Months or More   830
Securities Available for Sale, Fair Value    
Twelve Months or More   73,890
U.S. Treasuries | Maximum    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 1,000  
U.S. Government agencies    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 23,498 24,607
Securities Held to Maturity, Fair Value    
Twelve Months or More 123,774 172,660
Securities Available for Sale, Gross Unrealized Losses    
Twelve Months or More 18,789 21,383
Securities Available for Sale, Fair Value    
Twelve Months or More 150,418 224,706
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 241,204 227,312
Securities Held to Maturity, Fair Value    
Twelve Months or More 1,056,339 1,210,790
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 294 122
Twelve Months or More 282,129 263,970
Securities Available for Sale, Fair Value    
Less Than Twelve Months 14,341 9,358
Twelve Months or More 1,350,268 1,539,208
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 72,057 68,139
Securities Held to Maturity, Fair Value    
Twelve Months or More 339,664 376,745
Securities Available for Sale, Gross Unrealized Losses    
Twelve Months or More 98,212 99,313
Securities Available for Sale, Fair Value    
Twelve Months or More 454,908 527,422
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 72,391 71,327
Securities Held to Maturity, Fair Value    
Twelve Months or More 275,947 282,728
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 792 91
Twelve Months or More 193,788 194,380
Securities Available for Sale, Fair Value    
Less Than Twelve Months 53,342 7,959
Twelve Months or More 918,338 955,059
State and municipal obligations    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 1,484 177
Twelve Months or More 170,125 152,114
Securities Available for Sale, Fair Value    
Less Than Twelve Months 19,400 6,340
Twelve Months or More 923,431 967,305
Small Business Administration loan-backed securities    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 10,993 11,319
Securities Held to Maturity, Fair Value    
Twelve Months or More 38,803 41,814
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 24 128
Twelve Months or More 41,697 42,222
Securities Available for Sale, Fair Value    
Less Than Twelve Months 6,747 42,447
Twelve Months or More 289,786 304,770
Corporate securities    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months   18
Twelve Months or More 1,990 3,768
Securities Available for Sale, Fair Value    
Less Than Twelve Months   480
Twelve Months or More $ 26,509 $ 26,267