Investment Securities Held-to-maturity Securities by Maturities (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
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	1,362
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost	8,963
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	56,193
Amortized Cost	66,518	$ 31,747
Fair value of securities maturing within 1 year	0
Fair value of securities maturing in 1-5 years	1,545
Fair value of securities maturing in 5-10 years	9,780
Fair value of securities maturing in over 10 years	56,757
Fair Value	$ 68,082	$ 32,541
Average yield of securities maturing within 1 year	0.00%
Average yield of securities maturing in over 10 years	1.04%
Total average yield	1.29%
Debt Securities, Held-to-maturity, Maturity, Rolling after Five Through Ten Years, Weighted Average Yield	2.97%
Debt Securities, Held-to-maturity, Maturity, Rolling after One Through Five Years, Weighted Average Yield	0.63%
Federal income tax rate	21.00%	21.00%	21.00%
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	$ 0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost	988
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost	2,511
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	31,700
Amortized Cost	35,199
Fair value of securities maturing within 1 year	0
Fair value of securities maturing in 1-5 years	1,163
Fair value of securities maturing in 5-10 years	2,832
Fair value of securities maturing in over 10 years	31,489
Fair Value	35,484	$ 4,791
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	2,715
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	23,175
Amortized Cost	25,890
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	2,820
Fair value of securities maturing in over 10 years	23,922
Fair Value	26,742	21,569
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	374
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost	3,737
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	1,318
Amortized Cost	5,429
Fair value of securities maturing within 1 year	0
Fair value of securities maturing in 1-5 years	382
Fair value of securities maturing in 5-10 years	4,128
Fair value of securities maturing in over 10 years	1,346
Fair Value	$ 5,856	$ 6,181

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

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