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Securities - Securities with gross unrealized losses (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
Investment Securities    
Number of securities with gross unrealized loss | item 296  
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months $ 31,633 $ 1,123
Twelve Months or More 10,522  
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 1,316,106 240,591
Twelve Months or More 307,277  
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 46,537 3,144
Twelve Months or More 17,261 1,021
Securities Available for Sale, Fair Value    
Less Than Twelve Months 2,935,314 542,297
Twelve Months or More 462,192 105,125
U.S. Government agencies    
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 1,745  
Twelve Months or More 882  
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 86,168  
Twelve Months or More 24,118  
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 529 642
Twelve Months or More 1,236  
Securities Available for Sale, Fair Value    
Less Than Twelve Months 73,353 24,358
Twelve Months or More 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 18,768 1,032
Twelve Months or More 5,510  
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 868,327 213,146
Twelve Months or More 184,819  
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 17,381 1,031
Twelve Months or More 8,604  
Securities Available for Sale, Fair Value    
Less Than Twelve Months 1,274,934 260,411
Twelve Months or More 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 4,937  
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 169,240  
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 10,911 825
Securities Available for Sale, Fair Value    
Less Than Twelve Months 432,300 140,333
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 4,902 91
Twelve Months or More 3,119  
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 154,963 27,445
Twelve Months or More 75,450  
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 13,120 46
Twelve Months or More 5,310 4
Securities Available for Sale, Fair Value    
Less Than Twelve Months 846,581 13,594
Twelve Months or More 98,106 871
State and municipal obligations    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 1,867 27
Twelve Months or More 352  
Securities Available for Sale, Fair Value    
Less Than Twelve Months 123,987 8,620
Twelve Months or More 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 1,011  
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 37,408  
Twelve Months or More 22,890  
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 2,720 573
Twelve Months or More 1,759 1,017
Securities Available for Sale, Fair Value    
Less Than Twelve Months 179,168 94,981
Twelve Months or More 110,309 $ 104,254
Corporate securities.    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 9  
Securities Available for Sale, Fair Value    
Less Than Twelve Months $ 4,991