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Securities - Securities with gross unrealized losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months $ 106,408 $ 31,633
Twelve Months or More 90,974 10,522
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 1,612,546 1,316,106
Twelve Months or More 842,065 307,277
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 306,059 46,537
Twelve Months or More 86,863 17,261
Securities Available for Sale, Fair Value    
Less Than Twelve Months 4,705,175 2,935,314
Twelve Months or More 853,053 462,192
U.S. Treasuries    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 1,966  
Securities Available for Sale, Fair Value    
Less Than Twelve Months 268,581  
U.S. Government agencies    
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 6,624 1,745
Twelve Months or More 5,694 882
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 140,646 86,168
Twelve Months or More 44,295 24,118
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 8,124 529
Twelve Months or More 2,833 1,236
Securities Available for Sale, Fair Value    
Less Than Twelve Months 157,776 73,353
Twelve Months or More 22,166 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 67,934 18,768
Twelve Months or More 57,103 5,510
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 1,058,367 868,327
Twelve Months or More 556,812 184,819
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 98,405 17,381
Twelve Months or More 44,374 8,604
Securities Available for Sale, Fair Value    
Less Than Twelve Months 1,607,878 1,274,934
Twelve Months or More 398,080 221,435
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 17,920 4,937
Twelve Months or More 7,031  
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 273,429 169,240
Twelve Months or More 55,589  
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 32,801 10,911
Twelve Months or More 11,729  
Securities Available for Sale, Fair Value    
Less Than Twelve Months 562,732 432,300
Twelve Months or More 90,910  
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 13,930 4,902
Twelve Months or More 14,743 3,119
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 140,104 154,963
Twelve Months or More 129,759 75,450
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 79,666 13,120
Twelve Months or More 15,809 5,310
Securities Available for Sale, Fair Value    
Less Than Twelve Months 876,459 846,581
Twelve Months or More 171,206 98,106
State and municipal obligations    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 71,078 1,867
Twelve Months or More 4,748 352
Securities Available for Sale, Fair Value    
Less Than Twelve Months 960,986 123,987
Twelve Months or More 29,605 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 6,403 1,011
Securities Held to Maturity, Fair Value    
Less Than Twelve Months   37,408
Twelve Months or More 55,610 22,890
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 13,526 2,720
Twelve Months or More 7,370 1,759
Securities Available for Sale, Fair Value    
Less Than Twelve Months 247,135 179,168
Twelve Months or More 141,086 110,309
Corporate securities.    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 493 9
Securities Available for Sale, Fair Value    
Less Than Twelve Months $ 23,628 $ 4,991