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Investment Securities - Unrealized losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Schedule of Available-for-sale Securities    
Debt securities, amortized cost $ 689,001 $ 466,747
Less than 12 Months, Fair Value 105,252 159,032
12 Months or More, Fair Value 81,237 88,855
Total Fair Value 186,489 247,887
Less than 12 Months, Unrealized Losses (1,085) (2,476)
12 Months or More, Unrealized Losses (1,195) (2,213)
Total Unrealized Losses (2,280) (4,689)
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Debt securities, amortized cost 651 14,740
Less than 12 Months, Fair Value   0
12 Months or More, Fair Value   13,713
Total Fair Value   13,713
Less than 12 Months, Unrealized Losses   0
12 Months or More, Unrealized Losses   (258)
Total Unrealized Losses   (258)
Obligations of states and political subdivisions    
Schedule of Available-for-sale Securities    
Debt securities, amortized cost 361,734 89,574
Less than 12 Months, Fair Value 36,209 65,606
12 Months or More, Fair Value 0 0
Total Fair Value 36,209 65,606
Less than 12 Months, Unrealized Losses (339) (1,428)
12 Months or More, Unrealized Losses 0 0
Total Unrealized Losses (339) (1,428)
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations    
Schedule of Available-for-sale Securities    
Debt securities, amortized cost 214,203 198,125
Less than 12 Months, Fair Value 30,755 71,650
12 Months or More, Fair Value 77,337 69,518
Total Fair Value 108,092 141,168
Less than 12 Months, Unrealized Losses (385) (932)
12 Months or More, Unrealized Losses (1,095) (1,883)
Total Unrealized Losses (1,480) (2,815)
Private label residential mortgage and asset backed securities    
Schedule of Available-for-sale Securities    
Debt securities, amortized cost 82,413 155,308
Less than 12 Months, Fair Value 25,407 17,811
12 Months or More, Fair Value 0 5,624
Total Fair Value 25,407 23,435
Less than 12 Months, Unrealized Losses (242) (81)
12 Months or More, Unrealized Losses 0 (72)
Total Unrealized Losses (242) (153)
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities    
Debt securities, amortized cost 30,000 9,000
Less than 12 Months, Fair Value 12,881 3,965
12 Months or More, Fair Value 3,900 0
Total Fair Value 16,781 3,965
Less than 12 Months, Unrealized Losses (119) (35)
12 Months or More, Unrealized Losses (100) 0
Total Unrealized Losses $ (219) $ (35)