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Investment Securities - Information concerning investments with unrealized losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Available-For-Sale-Securities-And-Held-To-Maturity-Securities    
Less than 12 months, Fair Value $ 8,596 $ 39,784
Less than 12 months, Unrealized Losses 54 694
12 months or longer, Fair Value 28,079 78,532
12 months or longer, Unrealized Losses 530 2,512
Total, Fair Value 36,675 118,316
Total, Unrealized Losses 584 3,206
U.S. Agency    
Available-For-Sale-Securities-And-Held-To-Maturity-Securities    
Less than 12 months, Fair Value 0 244
Less than 12 months, Unrealized Losses 0 6
12 months or longer, Fair Value 0 5,631
12 months or longer, Unrealized Losses 0 154
Total, Fair Value 0 5,875
Total, Unrealized Losses 0 160
U.S. Agency mortgage-backed securities    
Available-For-Sale-Securities-And-Held-To-Maturity-Securities    
Less than 12 months, Fair Value 4,602 17,718
Less than 12 months, Unrealized Losses 20 177
12 months or longer, Fair Value 10,804 39,983
12 months or longer, Unrealized Losses 86 1,113
Total, Fair Value 15,406 57,701
Total, Unrealized Losses 106 1,290
Municipal [Member]    
Available-For-Sale-Securities-And-Held-To-Maturity-Securities    
Less than 12 months, Fair Value 943 6,601
Less than 12 months, Unrealized Losses 3 71
12 months or longer, Fair Value 1,130 15,880
12 months or longer, Unrealized Losses 47 567
Total, Fair Value 2,073 22,481
Total, Unrealized Losses 50 638
Corporate bonds and other securities [Member]    
Available-For-Sale-Securities-And-Held-To-Maturity-Securities    
Less than 12 months, Fair Value 3,051 15,221
Less than 12 months, Unrealized Losses 31 440
12 months or longer, Fair Value 16,145 17,038
12 months or longer, Unrealized Losses 397 678
Total, Fair Value 19,196 32,259
Total, Unrealized Losses $ 428 $ 1,118