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Investment Securities - Scheduled Maturities of Investment Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Investments Debt And Equity Securities [Abstract]
Available-for-sale, maturing within one year, amortized cost	$ 102
Available-for-sale, maturing after one to five years, amortized cost	20,916
Available-for-sale, maturing after five to ten years, amortized cost	43,510
Available-for-sale, maturing after ten years, amortized cost	32,354
Available-for-sale, amortized cost	96,882	$ 135,656
Available-for-sale, maturing within one year, estimated fair value	103
Available-for-sale, maturing after one to five years, estimated fair value	20,843
Available-for-sale, maturing after five to ten years, estimated fair value	43,446
Available-for-sale, maturing after ten years, estimated fair value	32,158
Total	96,550	132,487
Held-to-maturity, maturing after one to five years, amortized cost	3,359
Held-to-maturity, maturing after five to ten years, amortized cost	7,250
Held-to-maturity, maturing after ten years, amortized cost	7,150
Held-to-maturity, amortized cost	17,759	21,462
Held-to-maturity, maturing after one to five years, estimated fair value	3,365
Held-to-maturity, maturity after five to ten years, estimated fair value	7,194
Held-to-maturity, maturing after ten years, estimated fair value	7,102
Total	$ 17,661	$ 20,852

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