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Securities - Securities with gross unrealized losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More $ 430,022 $ 402,704
Securities Held to Maturity, Fair Value    
Twelve Months or More 2,016,567 2,084,737
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 2,251 536
Twelve Months or More 828,929 777,980
Securities Available for Sale, Fair Value    
Less Than Twelve Months 61,019 66,584
Twelve Months or More 4,442,556 4,618,627
U.S. Treasuries    
Securities Available for Sale, Gross Unrealized Losses    
Twelve Months or More 333 830
Securities Available for Sale, Fair Value    
Twelve Months or More 24,597 73,890
U.S. Government agencies    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 25,821 24,607
Securities Held to Maturity, Fair Value    
Twelve Months or More 171,448 172,660
Securities Available for Sale, Gross Unrealized Losses    
Twelve Months or More 22,313 21,383
Securities Available for Sale, Fair Value    
Twelve Months or More 223,805 224,706
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 246,764 227,312
Securities Held to Maturity, Fair Value    
Twelve Months or More 1,159,676 1,210,790
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 135 122
Twelve Months or More 288,441 263,970
Securities Available for Sale, Fair Value    
Less Than Twelve Months 8,878 9,358
Twelve Months or More 1,473,944 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 72,593 68,139
Securities Held to Maturity, Fair Value    
Twelve Months or More 365,125 376,745
Securities Available for Sale, Gross Unrealized Losses    
Twelve Months or More 102,936 99,313
Securities Available for Sale, Fair Value    
Twelve Months or More 506,900 527,422
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 73,294 71,327
Securities Held to Maturity, Fair Value    
Twelve Months or More 279,105 282,728
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 63 91
Twelve Months or More 202,036 194,380
Securities Available for Sale, Fair Value    
Less Than Twelve Months 14,929 7,959
Twelve Months or More 932,902 955,059
State and municipal obligations    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 1,981 177
Twelve Months or More 165,496 152,114
Securities Available for Sale, Fair Value    
Less Than Twelve Months 19,989 6,340
Twelve Months or More 936,573 967,305
Small Business Administration loan-backed securities    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 11,550 11,319
Securities Held to Maturity, Fair Value    
Twelve Months or More 41,213 41,814
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 62 128
Twelve Months or More 43,717 42,222
Securities Available for Sale, Fair Value    
Less Than Twelve Months 16,734 42,447
Twelve Months or More 317,469 304,770
Corporate securities.    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 10 18
Twelve Months or More 3,657 3,768
Securities Available for Sale, Fair Value    
Less Than Twelve Months 489 480
Twelve Months or More $ 26,366 $ 26,267