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Investment Securities - Scheduled Maturities of Investment Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]
Available-for-sale, maturing within one year, amortized cost	$ 1,601
Available-for-sale, maturing after one to five years, amortized cost	15,561
Available-for-sale, maturing after five to ten years, amortized cost	43,163
Available-for-sale, maturing after ten years, amortized cost	35,443
Available-for-sale, amortized cost	95,768	$ 94,071
Available-for-sale, maturing within one year, estimated fair value	1,621
Available-for-sale, maturing after one to five years, estimated fair value	15,706
Available-for-sale, maturing after five to ten years, estimated fair value	43,770
Available-for-sale, maturing after ten years, estimated fair value	35,444
Available-for-sale, amortized cost	96,541	94,016
Held-to-maturity, maturing within one year, amortized cost	40
Held-to-maturity, maturing after one to five years, amortized cost	766
Held-to-maturity, maturing after five to ten years, amortized cost	6,852
Held-to-maturity, maturing after ten years, amortized cost	5,880
Held-to-maturity, amortized cost	13,538	14,340
Held-to-maturity, maturing within one year, estimated fair value	40
Held-to-maturity, maturing after one to five years, estimated fair value	750
Held-to-maturity, maturity after five to ten years, estimated fair value	6,891
Held-to-maturity, maturing after ten years, estimated fair value	5,964
Held-to-maturity, amortized cost	$ 13,645	$ 14,306

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