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Investment Securities - Securities with gross unrealized losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More $ 427,587 $ 402,704
Securities Held to Maturity, Fair Value    
Twelve Months or More 1,920,941 2,084,737
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 2,117 536
Twelve Months or More 825,029 777,980
Securities Available for Sale, Fair Value    
Less Than Twelve Months 57,829 66,584
Twelve Months or More 4,334,325 4,618,627
U.S. Treasuries    
Securities Available for Sale, Gross Unrealized Losses    
Twelve Months or More 153 830
Securities Available for Sale, Fair Value    
Less Than Twelve Months 10,834  
Twelve Months or More 24,815 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 24,781 24,607
Securities Held to Maturity, Fair Value    
Twelve Months or More 122,489 172,660
Securities Available for Sale, Gross Unrealized Losses    
Twelve Months or More 21,025 21,383
Securities Available for Sale, Fair Value    
Twelve Months or More 195,123 224,706
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 243,434 227,312
Securities Held to Maturity, Fair Value    
Twelve Months or More 1,126,708 1,210,790
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 136 122
Twelve Months or More 286,293 263,970
Securities Available for Sale, Fair Value    
Less Than Twelve Months 8,848 9,358
Twelve Months or More 1,430,209 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 73,856 68,139
Securities Held to Maturity, Fair Value    
Twelve Months or More 354,612 376,745
Securities Available for Sale, Gross Unrealized Losses    
Twelve Months or More 102,173 99,313
Securities Available for Sale, Fair Value    
Twelve Months or More 489,387 527,422
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 74,117 71,327
Securities Held to Maturity, Fair Value    
Twelve Months or More 277,064 282,728
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 106 91
Twelve Months or More 199,119 194,380
Securities Available for Sale, Fair Value    
Less Than Twelve Months 16,816 7,959
Twelve Months or More 920,215 955,059
State and municipal obligations    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 1,860 177
Twelve Months or More 169,869 152,114
Securities Available for Sale, Fair Value    
Less Than Twelve Months 20,142 6,340
Twelve Months or More 930,359 967,305
Small Business Administration loan-backed securities    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 11,399 11,319
Securities Held to Maturity, Fair Value    
Twelve Months or More 40,068 41,814
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 2 128
Twelve Months or More 43,219 42,222
Securities Available for Sale, Fair Value    
Less Than Twelve Months 704 42,447
Twelve Months or More 317,384 304,770
Corporate securities    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 13 18
Twelve Months or More 3,178 3,768
Securities Available for Sale, Fair Value    
Less Than Twelve Months 485 480
Twelve Months or More $ 26,833 $ 26,267