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Securities - Securities with gross unrealized losses (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
item
Dec. 31, 2022
USD ($)
Investment Securities    
Number of securities with gross unrealized loss | item 1,232  
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months   $ 115,297
Twelve Months or More $ 402,704 317,776
Securities Held to Maturity, Fair Value    
Less Than Twelve Months   952,682
Twelve Months or More 2,084,737 1,297,486
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 536 197,789
Twelve Months or More 777,980 695,584
Securities Available for Sale, Fair Value    
Less Than Twelve Months 66,584 2,082,068
Twelve Months or More 4,618,627 3,073,871
U.S. Treasuries    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months   6,778
Twelve Months or More 830  
Securities Available for Sale, Fair Value    
Less Than Twelve Months   265,638
Twelve Months or More 73,890  
U.S. Government agencies    
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months   5,514
Twelve Months or More 24,607 24,273
Securities Held to Maturity, Fair Value    
Less Than Twelve Months   78,833
Twelve Months or More 172,660 88,642
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months   8,193
Twelve Months or More 21,383 18,691
Securities Available for Sale, Fair Value    
Less Than Twelve Months   138,807
Twelve Months or More 224,706 80,281
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months   65,181
Twelve Months or More 227,312 189,912
Securities Held to Maturity, Fair Value    
Less Than Twelve Months   513,086
Twelve Months or More 1,210,790 823,467
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 122 42,767
Twelve Months or More 263,970 255,285
Securities Available for Sale, Fair Value    
Less Than Twelve Months 9,358 459,773
Twelve Months or More 1,539,208 1,238,580
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months   30,284
Twelve Months or More 68,139 39,380
Securities Held to Maturity, Fair Value    
Less Than Twelve Months   277,868
Twelve Months or More 376,745 127,128
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months   21,450
Twelve Months or More 99,313 85,842
Securities Available for Sale, Fair Value    
Less Than Twelve Months   274,082
Twelve Months or More 527,422 326,963
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months   14,318
Twelve Months or More 71,327 51,986
Securities Held to Maturity, Fair Value    
Less Than Twelve Months   82,895
Twelve Months or More 282,728 213,387
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 91 17,156
Twelve Months or More 194,380 181,688
Securities Available for Sale, Fair Value    
Less Than Twelve Months 7,959 206,228
Twelve Months or More 955,059 767,002
State and municipal obligations    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 177 97,084
Twelve Months or More 152,114 108,799
Securities Available for Sale, Fair Value    
Less Than Twelve Months 6,340 616,631
Twelve Months or More 967,305 391,848
Small Business Administration loan-backed securities    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 11,319 12,225
Securities Held to Maturity, Fair Value    
Twelve Months or More 41,814 44,862
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 128 2,152
Twelve Months or More 42,222 44,543
Securities Available for Sale, Fair Value    
Less Than Twelve Months 42,447 92,535
Twelve Months or More 304,770 264,933
Corporate securities.    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 18 2,209
Twelve Months or More 3,768 736
Securities Available for Sale, Fair Value    
Less Than Twelve Months 480 28,374
Twelve Months or More $ 26,267 $ 4,264