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Investment Securities - Securities with gross unrealized losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months $ 25,123 $ 3,144
Twelve Months or More 835 1,021
Securities Available for Sale, Fair Value    
Less Than Twelve Months 1,360,682 542,297
Twelve Months or More 115,928 105,125
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 20,929 1,123
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 1,091,175 240,591
U.S. Government agencies    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 1,163 642
Securities Available for Sale, Fair Value    
Less Than Twelve Months 48,137 24,358
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 937  
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 49,051  
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 13,457 1,031
Twelve Months or More 65  
Securities Available for Sale, Fair Value    
Less Than Twelve Months 743,915 260,411
Twelve Months or More 3,887  
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 13,263 1,032
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 714,764 213,146
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 3,756 825
Securities Available for Sale, Fair Value    
Less Than Twelve Months 137,487 140,333
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 2,457  
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 94,707  
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 4,570 46
Twelve Months or More   4
Securities Available for Sale, Fair Value    
Less Than Twelve Months 289,674 13,594
Twelve Months or More   871
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 3,950 91
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 168,822 27,445
State and municipal obligations    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 1,383 27
Twelve Months or More 4  
Securities Available for Sale, Fair Value    
Less Than Twelve Months 74,127 8,620
Twelve Months or More 3,938  
Small Business Administration loan-backed securities    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 794 573
Twelve Months or More 766 1,017
Securities Available for Sale, Fair Value    
Less Than Twelve Months 67,342 94,981
Twelve Months or More 108,103 $ 104,254
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 322  
Securities Held to Maturity, Fair Value    
Less Than Twelve Months $ 63,831