Securities, Amortized Cost and Fair Value of Securities Held-to-maturity (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Held-to-maturity, Maturity, Amortized Cost [Abstract]
Amortized Cost	$ 10,020	$ 12,033
Gross Unrealized Gains	324	372
Gross Unrecognized Losses	0	(1)
Estimated Fair Value	10,344	12,404
Unrealized Losses and Other-than-temporary Impairment [Abstract]
Proceeds from sale of debt securities	0	0	$ 0
Debt securities	83,344	78,418
Other than temporary impairment losses	0	0
Obligations of States and Political Subdivisions [Member]
Debt Securities, Held-to-maturity, Maturity, Amortized Cost [Abstract]
Amortized Cost	10,018	12,031
Gross Unrealized Gains	324	372
Gross Unrecognized Losses	0	(1)
Estimated Fair Value	10,342	12,402
Agency Mortgage-backed Securities, Residential [Member]
Debt Securities, Held-to-maturity, Maturity, Amortized Cost [Abstract]
Amortized Cost	2	2
Gross Unrealized Gains	0	0
Gross Unrecognized Losses	0	0
Estimated Fair Value	$ 2	$ 2

Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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Amount of accumulated unrealized loss on investment in debt security 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).

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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