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Investment Securities - Securities with gross unrealized losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More $ 337,561 $ 402,704
Securities Held to Maturity, Fair Value    
Twelve Months or More 1,963,746 2,084,737
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 1,341 536
Twelve Months or More 641,700 777,980
Securities Available for Sale, Fair Value    
Less Than Twelve Months 36,769 66,584
Twelve Months or More 4,375,170 4,618,627
U.S. Treasuries    
Securities Available for Sale, Gross Unrealized Losses    
Twelve Months or More   830
Securities Available for Sale, Fair Value    
Less Than Twelve Months 696  
Twelve Months or More   73,890
U.S. Treasuries | Maximum    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 1  
U.S. Government agencies    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 19,271 24,607
Securities Held to Maturity, Fair Value    
Twelve Months or More 128,000 172,660
Securities Available for Sale, Gross Unrealized Losses    
Twelve Months or More 15,453 21,383
Securities Available for Sale, Fair Value    
Twelve Months or More 175,724 224,706
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 188,925 227,312
Securities Held to Maturity, Fair Value    
Twelve Months or More 1,144,338 1,210,790
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 80 122
Twelve Months or More 216,781 263,970
Securities Available for Sale, Fair Value    
Less Than Twelve Months 17,925 9,358
Twelve Months or More 1,452,928 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 58,371 68,139
Securities Held to Maturity, Fair Value    
Twelve Months or More 361,467 376,745
Securities Available for Sale, Gross Unrealized Losses    
Twelve Months or More 82,254 99,313
Securities Available for Sale, Fair Value    
Twelve Months or More 487,928 527,422
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 61,691 71,327
Securities Held to Maturity, Fair Value    
Twelve Months or More 288,169 282,728
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months   91
Twelve Months or More 157,131 194,380
Securities Available for Sale, Fair Value    
Less Than Twelve Months   7,959
Twelve Months or More 958,412 955,059
State and municipal obligations    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 1,259 177
Twelve Months or More 133,136 152,114
Securities Available for Sale, Fair Value    
Less Than Twelve Months 17,464 6,340
Twelve Months or More 960,941 967,305
Small Business Administration loan-backed securities    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 9,303 11,319
Securities Held to Maturity, Fair Value    
Twelve Months or More 41,772 41,814
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 2 128
Twelve Months or More 34,430 42,222
Securities Available for Sale, Fair Value    
Less Than Twelve Months 684 42,447
Twelve Months or More 311,253 304,770
Corporate securities    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months   18
Twelve Months or More 2,515 3,768
Securities Available for Sale, Fair Value    
Less Than Twelve Months   480
Twelve Months or More $ 27,984 $ 26,267