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Investment Securities - Securities with gross unrealized losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Securities Available for Sale, Gross Unrealized Losses      
Less Than Twelve Months $ 3,097 $ 3,186 $ 1,156
Twelve Months or More 1,090 1,353 1,375
Securities Available for Sale, Fair Value      
Less Than Twelve Months 741,122 503,728 317,961
Twelve Months or More 110,312 141,982 154,111
State and municipal obligations      
Securities Available for Sale, Gross Unrealized Losses      
Less Than Twelve Months 109 764 43
Securities Available for Sale, Fair Value      
Less Than Twelve Months 43,880 42,070 5,275
Mortgage-backed securities      
Securities Available for Sale, Gross Unrealized Losses      
Less Than Twelve Months 2,988 2,422 1,113
Twelve Months or More 1,090 1,353 1,375
Securities Available for Sale, Fair Value      
Less Than Twelve Months 697,242 461,658 312,686
Twelve Months or More $ 110,312 $ 141,982 $ 154,111