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Disclosures of Fair Values of Financial Instruments - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Available-for-sale securities:
Total available-for-sale securities	$ 879,240,000	$ 685,636,000
Equity securities, at fair value	218,000	412,000
U.S. Treasury Securities and Obligations of U.S. Government Corporations & Agencies
Available-for-sale securities:
Total available-for-sale securities	127,069,000	107,320,000
Obligations of States and Political Subdivisions
Available-for-sale securities:
Total available-for-sale securities	249,844,000	178,433,000
Mortgage-backed Securities
Available-for-sale securities:
Total available-for-sale securities	491,348,000	396,126,000
Other Securities
Available-for-sale securities:
Total available-for-sale securities	10,979,000	3,757,000
Fair Value, Recurring
Available-for-sale securities:
Total available-for-sale securities	879,240,000	685,636,000
Equity securities, at fair value	218,000	412,000
Derivative assets: interest rate swaps	1,399,000
Total assets	880,857,000	686,048,000
Derivative liabilities: interest swaps	2,892,000	325,000
Fair Value, Recurring | U.S. Treasury Securities and Obligations of U.S. Government Corporations & Agencies
Available-for-sale securities:
Total available-for-sale securities	127,069,000	107,320,000
Fair Value, Recurring | Obligations of States and Political Subdivisions
Available-for-sale securities:
Total available-for-sale securities	249,844,000	178,433,000
Fair Value, Recurring | Mortgage-backed Securities
Available-for-sale securities:
Total available-for-sale securities	491,348,000	396,126,000
Fair Value, Recurring | Other Securities
Available-for-sale securities:
Total available-for-sale securities	10,979,000	3,757,000
Quoted Prices in Active Markets for Identical Assets (Level 1)
Available-for-sale securities:
Total available-for-sale securities	0	0
Equity securities, at fair value	218,000	219,000
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring
Available-for-sale securities:
Total available-for-sale securities	0	0
Equity securities, at fair value	218,000	219,000
Derivative assets: interest rate swaps	0
Total assets	218,000	219,000
Derivative liabilities: interest swaps	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | U.S. Treasury Securities and Obligations of U.S. Government Corporations & Agencies
Available-for-sale securities:
Total available-for-sale securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | Obligations of States and Political Subdivisions
Available-for-sale securities:
Total available-for-sale securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | Mortgage-backed Securities
Available-for-sale securities:
Total available-for-sale securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | Other Securities
Available-for-sale securities:
Total available-for-sale securities	0	0
Significant Other Observable Inputs (Level 2)
Available-for-sale securities:
Total available-for-sale securities	878,446,000	684,856,000
Equity securities, at fair value	0	0
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring
Available-for-sale securities:
Total available-for-sale securities	878,446,000	684,663,000
Equity securities, at fair value	193,000	193,000
Derivative assets: interest rate swaps	1,399,000
Total assets	880,038,000	684,856,000
Derivative liabilities: interest swaps	2,892,000	325,000
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | U.S. Treasury Securities and Obligations of U.S. Government Corporations & Agencies
Available-for-sale securities:
Total available-for-sale securities	127,069,000	107,320,000
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Obligations of States and Political Subdivisions
Available-for-sale securities:
Total available-for-sale securities	249,050,000	177,460,000
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Mortgage-backed Securities
Available-for-sale securities:
Total available-for-sale securities	491,348,000	396,126,000
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Other Securities
Available-for-sale securities:
Total available-for-sale securities	10,979,000	3,757,000
Significant Unobservable Inputs (Level 3)
Available-for-sale securities:
Total available-for-sale securities	794,000	780,000
Equity securities, at fair value	0	193,000
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring
Available-for-sale securities:
Total available-for-sale securities	794,000	973,000
Equity securities, at fair value	0	0
Derivative assets: interest rate swaps	0
Total assets	794,000	973,000
Derivative liabilities: interest swaps	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | U.S. Treasury Securities and Obligations of U.S. Government Corporations & Agencies
Available-for-sale securities:
Total available-for-sale securities	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Obligations of States and Political Subdivisions
Available-for-sale securities:
Total available-for-sale securities	794,000	973,000
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Mortgage-backed Securities
Available-for-sale securities:
Total available-for-sale securities	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Other Securities
Available-for-sale securities:
Total available-for-sale securities	$ 0	$ 0

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 326
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

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