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Investment Securities - Unrealized losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Schedule of Available-for-sale Securities    
Debt securities, amortized cost $ 466,747 $ 470,162
Less than 12 Months, Fair Value 159,032 118,138
12 Months or More, Fair Value 88,855 238,832
Total Fair Value 247,887 356,970
Less than 12 Months, Unrealized Losses (2,476) (972)
12 Months or More, Unrealized Losses (2,213) (8,499)
Total Unrealized Losses (4,689) (9,471)
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Debt securities, amortized cost 14,740 21,723
Less than 12 Months, Fair Value 0 14,891
12 Months or More, Fair Value 13,713 6,430
Total Fair Value 13,713 21,321
Less than 12 Months, Unrealized Losses 0 (254)
12 Months or More, Unrealized Losses (258) (148)
Total Unrealized Losses (258) (402)
Obligations of states and political subdivisions    
Schedule of Available-for-sale Securities    
Debt securities, amortized cost 89,574 79,886
Less than 12 Months, Fair Value 65,606 10,056
12 Months or More, Fair Value 0 22,945
Total Fair Value 65,606 33,001
Less than 12 Months, Unrealized Losses (1,428) (99)
12 Months or More, Unrealized Losses 0 (488)
Total Unrealized Losses (1,428) (587)
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations    
Schedule of Available-for-sale Securities    
Debt securities, amortized cost 198,125 239,388
Less than 12 Months, Fair Value 71,650 61,866
12 Months or More, Fair Value 69,518 124,673
Total Fair Value 141,168 186,539
Less than 12 Months, Unrealized Losses (932) (424)
12 Months or More, Unrealized Losses (1,883) (4,287)
Total Unrealized Losses (2,815) (4,711)
Private label residential mortgage and asset backed securities    
Schedule of Available-for-sale Securities    
Debt securities, amortized cost 155,308 129,165
Less than 12 Months, Fair Value 17,811 31,325
12 Months or More, Fair Value 5,624 84,784
Total Fair Value 23,435 116,109
Less than 12 Months, Unrealized Losses (81) (195)
12 Months or More, Unrealized Losses (72) (3,576)
Total Unrealized Losses (153) $ (3,771)
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities    
Debt securities, amortized cost 9,000  
Less than 12 Months, Fair Value 3,965  
12 Months or More, Fair Value 0  
Total Fair Value 3,965  
Less than 12 Months, Unrealized Losses (35)  
12 Months or More, Unrealized Losses 0  
Total Unrealized Losses $ (35)