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Investment Securities - Securities with gross unrealized losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months $ 33,468 $ 3,144
Twelve Months or More 9,783 1,021
Securities Available for Sale, Fair Value    
Less Than Twelve Months 2,198,476 542,297
Twelve Months or More 316,100 105,125
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 34,384 1,123
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 1,530,348 240,591
U.S. Government agencies    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 245 642
Twelve Months or More 1,248  
Securities Available for Sale, Fair Value    
Less Than Twelve Months 49,092 24,358
Twelve Months or More 23,752  
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 2,162  
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 85,750  
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 14,125 1,031
Twelve Months or More 3,229  
Securities Available for Sale, Fair Value    
Less Than Twelve Months 1,000,634 260,411
Twelve Months or More 92,550  
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 19,505 1,032
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 1,009,342 213,146
Agencies or sponsored enterprises    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 5,041 825
Securities Available for Sale, Fair Value    
Less Than Twelve Months 157,770 140,333
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 4,029  
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 140,511  
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 7,684 46
Twelve Months or More 3,581 4
Securities Available for Sale, Fair Value    
Less Than Twelve Months 617,854 13,594
Twelve Months or More 79,540 871
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 6,586 91
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 232,991 27,445
State and municipal obligations    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 3,956 27
Twelve Months or More 77  
Securities Available for Sale, Fair Value    
Less Than Twelve Months 238,688 8,620
Twelve Months or More 4,025  
Small Business Administration loan-backed securities    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 2,417 573
Twelve Months or More 1,648 1,017
Securities Available for Sale, Fair Value    
Less Than Twelve Months 134,438 94,981
Twelve Months or More 116,233 $ 104,254
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 2,102  
Securities Held to Maturity, Fair Value    
Less Than Twelve Months $ 61,754