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Investment Securities - Securities with gross unrealized losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months $ 44,456 $ 3,144
Twelve Months or More 1,189 1,021
Securities Available for Sale, Fair Value    
Less Than Twelve Months 1,720,518 542,297
Twelve Months or More 123,335 105,125
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 33,595 1,123
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 1,077,326 240,591
U.S. Government agencies    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 1,447 642
Securities Available for Sale, Fair Value    
Less Than Twelve Months 23,553 24,358
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 1,919  
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 48,069  
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 21,669 1,031
Securities Available for Sale, Fair Value    
Less Than Twelve Months 987,348 260,411
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 19,340 1,032
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 729,951 213,146
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 6,303 825
Securities Available for Sale, Fair Value    
Less Than Twelve Months 140,650 140,333
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 4,627  
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 94,699  
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 8,418 46
Twelve Months or More   4
Securities Available for Sale, Fair Value    
Less Than Twelve Months 271,699 13,594
Twelve Months or More   871
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 5,878 91
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 141,438 27,445
State and municipal obligations    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 4,361 27
Securities Available for Sale, Fair Value    
Less Than Twelve Months 153,477 8,620
Small Business Administration loan-backed securities    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 2,225 573
Twelve Months or More 1,189 1,017
Securities Available for Sale, Fair Value    
Less Than Twelve Months 136,824 94,981
Twelve Months or More 123,335 $ 104,254
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 1,831  
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 63,169  
Corporate securities.    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 33  
Securities Available for Sale, Fair Value    
Less Than Twelve Months $ 6,967