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Investment Securities - Scheduled Maturities of Investment Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Investments Debt And Equity Securities [Abstract]
Available-for-sale, maturing within one year, amortized cost	$ 341
Available-for-sale, maturing after one to five years, amortized cost	17,882
Available-for-sale, maturing after five to ten years, amortized cost	44,274
Available-for-sale, maturing after ten years, amortized cost	31,574
Available-for-sale, amortized cost	94,071	$ 135,656
Available-for-sale, maturing within one year, estimated fair value	344
Available-for-sale, maturing after one to five years, estimated fair value	17,881
Available-for-sale, maturing after five to ten years, estimated fair value	44,342
Available-for-sale, maturing after ten years, estimated fair value	31,449
Available-for-sale, amortized cost	94,016	132,487
Held-to-maturity, maturing within one year, amortized cost	60
Held-to-maturity, maturing after one to five years, amortized cost	767
Held-to-maturity, maturing after five to ten years, amortized cost	7,064
Held-to-maturity, maturing after ten years, amortized cost	6,449
Held-to-maturity, amortized cost	14,340	21,462
Held-to-maturity, maturing within one year, estimated fair value	60
Held-to-maturity, maturing after one to five years, estimated fair value	779
Held-to-maturity, maturity after five to ten years, estimated fair value	7,035
Held-to-maturity, maturing after ten years, estimated fair value	6,432
Held-to-maturity, amortized cost	$ 14,306	$ 20,852

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