Investment Securities Held-to-maturity Securities by Maturities (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost	$ 302
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost	398
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost	11,033
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	20,014
Amortized Cost	31,747	$ 36,961
Fair value of securities maturing within 1 year	303
Fair value of securities maturing in 1-5 years	402
Fair value of securities maturing in 5-10 years	11,814
Fair value of securities maturing in over 10 years	20,022
Fair Value	$ 32,541	$ 36,963
Average yield of securities maturing within 1 year	2.61%
Average yield of securities maturing in over 10 years	2.82%
Total average yield	2.80%
Debt Securities, Held-to-maturity, Maturity, Rolling after Five Through Ten Years, Weighted Average Yield	2.79%
Debt Securities, Held-to-maturity, Maturity, Rolling after One Through Five Years, Weighted Average Yield	2.29%
Federal income tax rate	21.00%	21.00%	35.00%
States and political subdivisions
Schedule of Held-to-maturity Securities
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost	$ 302
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost	0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost	3,543
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	501
Amortized Cost	4,346
Fair value of securities maturing within 1 year	303
Fair value of securities maturing in 1-5 years	0
Fair value of securities maturing in 5-10 years	3,986
Fair value of securities maturing in over 10 years	502
Fair Value	4,791	$ 4,896
Residential mortgage-backed securities
Schedule of Held-to-maturity Securities
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost	0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost	0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost	3,648
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	17,846
Amortized Cost	21,494
Fair value of securities maturing within 1 year	0
Fair value of securities maturing in 1-5 years	0
Fair value of securities maturing in 5-10 years	3,715
Fair value of securities maturing in over 10 years	17,854
Fair Value	21,569	28,603
Commercial mortgage-backed securities
Schedule of Held-to-maturity Securities
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost	0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost	398
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost	3,842
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	1,667
Amortized Cost	5,907
Fair value of securities maturing within 1 year	0
Fair value of securities maturing in 1-5 years	402
Fair value of securities maturing in 5-10 years	4,113
Fair value of securities maturing in over 10 years	1,666
Fair Value	$ 6,181	$ 3,464

Held-to-maturity Securities, Debt Maturities, Average Yield

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Weighted average yield of investment in debt security measured at amortized cost (held-to-maturity), maturing in sixth through tenth rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Weighted average yield of investment in debt security measured at amortized cost (held-to-maturity), maturing in second through fifth rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Weighted average yield of investment in debt security measured at amortized cost (held-to-maturity), maturing after tenth fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Weighted average yield of investment in debt security measured at amortized cost (held-to-maturity), maturing in next rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing after tenth rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in second through fifth rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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