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Securities - Securities with gross unrealized losses (Details)
$ in Thousands
Dec. 31, 2022
USD ($)
item
Dec. 31, 2021
USD ($)
Investment Securities    
Number of securities with gross unrealized loss | item 1,311  
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months $ 115,297 $ 31,633
Twelve Months or More 317,776 10,522
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 952,682 1,316,106
Twelve Months or More 1,297,486 307,277
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 197,789 46,537
Twelve Months or More 695,584 17,261
Securities Available for Sale, Fair Value    
Less Than Twelve Months 2,082,068 2,935,314
Twelve Months or More 3,073,871 462,192
U.S. Treasuries    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 6,778  
Securities Available for Sale, Fair Value    
Less Than Twelve Months 265,638  
U.S. Government agencies    
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 5,514 1,745
Twelve Months or More 24,273 882
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 78,833 86,168
Twelve Months or More 88,642 24,118
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 8,193 529
Twelve Months or More 18,691 1,236
Securities Available for Sale, Fair Value    
Less Than Twelve Months 138,807 73,353
Twelve Months or More 80,281 23,763
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 65,181 18,768
Twelve Months or More 189,912 5,510
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 513,086 868,327
Twelve Months or More 823,467 184,819
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 42,767 17,381
Twelve Months or More 255,285 8,604
Securities Available for Sale, Fair Value    
Less Than Twelve Months 459,773 1,274,934
Twelve Months or More 1,238,580 221,435
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 4,937
Twelve Months or More 39,380  
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 277,868 169,240
Twelve Months or More 127,128  
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 21,450 10,911
Twelve Months or More 85,842  
Securities Available for Sale, Fair Value    
Less Than Twelve Months 274,082 432,300
Twelve Months or More 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 4,902
Twelve Months or More 51,986 3,119
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 82,895 154,963
Twelve Months or More 213,387 75,450
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 17,156 13,120
Twelve Months or More 181,688 5,310
Securities Available for Sale, Fair Value    
Less Than Twelve Months 206,228 846,581
Twelve Months or More 767,002 98,106
State and municipal obligations    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 97,084 1,867
Twelve Months or More 108,799 352
Securities Available for Sale, Fair Value    
Less Than Twelve Months 616,631 123,987
Twelve Months or More 391,848 8,579
Small Business Administration loan-backed securities    
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months   1,281
Twelve Months or More 12,225 1,011
Securities Held to Maturity, Fair Value    
Less Than Twelve Months   37,408
Twelve Months or More 44,862 22,890
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 2,152 2,720
Twelve Months or More 44,543 1,759
Securities Available for Sale, Fair Value    
Less Than Twelve Months 92,535 179,168
Twelve Months or More 264,933 110,309
Corporate securities.    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 2,209 9
Twelve Months or More 736  
Securities Available for Sale, Fair Value    
Less Than Twelve Months 28,374 $ 4,991
Twelve Months or More $ 4,264