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Disclosures of Fair Values of Financial Instruments, Part II (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Foreclosed Assets Held for Sale [Abstract]
Other real estate owned	$ 3,644,000	$ 2,534,000
Financial Assets [Abstract]
Available-for-sale securities	686,048,000	692,274,000
Debt Securities, Held-to-maturity	69,542,000	69,436,000
Debt Securities, Held-to-maturity, Fair Value	69,572,000	67,909,000
Other borrowings	5,000,000	7,724,000
Carrying Amount
Financial Assets [Abstract]
Cash and due from banks	84,154,000	140,735,000
Federal funds sold	926,000	665,000
Certificates of deposit investments	4,625,000	7,569,000
Available-for-sale securities	686,048,000	692,274,000
Debt Securities, Held-to-maturity	69,542,000
Debt Securities, Held-to-maturity, Fair Value		69,436,000
Loans held for sale	1,820,000	1,508,000
Loans net of allowance for loan losses	2,666,616,000	2,616,822,000
Interest receivable	15,577,000	16,881,000
Federal Reserve Bank stock	9,401,000	7,390,000
Federal Home Loan Bank stock	4,105,000	3,095,000
Deposits	2,917,336,000	2,988,686,000
Securities sold under agreements to repurchase	208,109,000	192,330,000
Interest payable	2,261,000	1,758,000
Federal Home Loan Bank borrowings	113,895,000	119,745,000
Long-term Debt, Fair Value		7,724,000
Other borrowings	5,000,000
Junior subordinated debentures	18,858,000	29,000,000
Fair Value
Financial Assets [Abstract]
Cash and due from banks	84,154,000	140,735,000
Federal funds sold	926,000	665,000
Certificates of deposit investments	4,625,000	7,569,000
Available-for-sale securities	686,048,000	692,274,000
Debt Securities, Held-to-maturity, Fair Value	69,572,000	67,909,000
Loans held for sale	1,820,000	1,508,000
Loans net of allowance for loan losses	2,622,053,000	2,541,037,000
Interest receivable	15,577,000	16,881,000
Federal Reserve Bank stock	9,401,000	7,390,000
Federal Home Loan Bank stock	4,105,000	3,095,000
Deposits	2,924,144,000	2,991,177,000
Securities sold under agreements to repurchase	208,016,000	192,179,000
Interest payable	2,261,000	1,758,000
Federal Home Loan Bank borrowings	114,510,000	119,704,000
Long-term Debt, Fair Value		7,724,000
Other borrowings	5,000,000
Junior subordinated debentures	15,596,000	24,418,000
Fair Value, Measurements, Nonrecurring [Member] | Carrying Amount
Foreclosed Assets Held for Sale [Abstract]
Other real estate owned	3,644,000	2,534,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value
Foreclosed Assets Held for Sale [Abstract]
Other real estate owned	935,000	836,000
Fair Value, Inputs, Level 1 [Member]
Financial Assets [Abstract]
Cash and due from banks	84,154,000	140,735,000
Federal funds sold	926,000	665,000
Certificates of deposit investments	0	0
Available-for-sale securities	219,000	364,000
Loans held for sale	0	0
Loans net of allowance for loan losses	0	0
Interest receivable	0	0
Federal Reserve Bank stock	0	0
Federal Home Loan Bank stock	0	0
Deposits	0	0
Securities sold under agreements to repurchase	0	0
Interest payable	0	0
Federal Home Loan Bank borrowings	0	0
Long-term Debt, Fair Value		0
Other borrowings	5,000,000
Junior subordinated debentures	0	0
Fair Value, Inputs, Level 2 [Member]
Financial Assets [Abstract]
Cash and due from banks	0	0
Federal funds sold	0	0
Certificates of deposit investments	4,625,000	7,569,000
Available-for-sale securities	684,856,000	690,943,000
Debt Securities, Held-to-maturity, Fair Value	69,572,000	67,909,000
Loans held for sale	1,820,000	1,508,000
Loans net of allowance for loan losses	0	0
Interest receivable	15,577,000	16,881,000
Federal Reserve Bank stock	9,401,000	7,390,000
Federal Home Loan Bank stock	4,105,000	3,095,000
Deposits	2,332,866,000	2,396,917,000
Securities sold under agreements to repurchase	208,016,000	192,179,000
Interest payable	2,261,000	1,758,000
Federal Home Loan Bank borrowings	114,510,000	119,704,000
Long-term Debt, Fair Value		7,724,000
Other borrowings	0
Junior subordinated debentures	15,596,000	24,418,000
Fair Value, Inputs, Level 3 [Member]
Financial Assets [Abstract]
Cash and due from banks	0	0
Federal funds sold	0	0
Certificates of deposit investments	0	0
Available-for-sale securities	973,000	967,000
Loans held for sale	0	0
Loans net of allowance for loan losses	2,622,053,000	2,541,037,000
Interest receivable	0	0
Federal Reserve Bank stock	0	0
Federal Home Loan Bank stock	0	0
Deposits	591,278,000	594,260,000
Securities sold under agreements to repurchase	0	0
Interest payable	0	0
Federal Home Loan Bank borrowings	0	0
Long-term Debt, Fair Value		0
Other borrowings	0
Junior subordinated debentures	0	0
Impaired loans (collateral dependent) | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	12,727,000	16,437,000
Impaired loans (collateral dependent) | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	0	0
Impaired loans (collateral dependent) | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	$ 0	$ 0
Impaired loans (collateral dependent) | Fair Value, Inputs, Level 3 [Member] | Minimum [Member] | Third Party Valuations [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Discount to reflect realizable value (in hundredths)	0.00%	0.00%
Impaired loans (collateral dependent) | Fair Value, Inputs, Level 3 [Member] | Maximum [Member] | Third Party Valuations [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Discount to reflect realizable value (in hundredths)	40.00%	40.00%
Impaired loans (collateral dependent) | Fair Value, Inputs, Level 3 [Member] | Weighted Average [Member] | Third Party Valuations [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Discount to reflect realizable value (in hundredths)	20.00%	20.00%
Impaired loans (collateral dependent) | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	$ 12,727,000	$ 16,437,000
Foreclosed assets held for sale | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	935,000	836,000
Foreclosed assets held for sale | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	0	0
Foreclosed assets held for sale | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	$ 0	$ 0
Foreclosed assets held for sale | Fair Value, Inputs, Level 3 [Member] | Minimum [Member] | Third Party Valuations [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Discount to reflect realizable value less estimated selling costs (in hundredths)	0.00%	0.00%
Foreclosed assets held for sale | Fair Value, Inputs, Level 3 [Member] | Maximum [Member] | Third Party Valuations [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Discount to reflect realizable value less estimated selling costs (in hundredths)	40.00%	40.00%
Foreclosed assets held for sale | Fair Value, Inputs, Level 3 [Member] | Weighted Average [Member] | Third Party Valuations [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Discount to reflect realizable value less estimated selling costs (in hundredths)	35.00%	35.00%
Foreclosed assets held for sale | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	$ 935,000	$ 836,000
Mortgage Servicing Rights [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	1,444,000
Mortgage Servicing Rights, Carrying Value	1,690,000
Mortgage Servicing Rights, Fair Value	1,444,000
Mortgage Servicing Rights (MSR) Impairment (Recovery)	245,000
Mortgage Servicing Rights [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	0
Mortgage Servicing Rights [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	$ 0
Mortgage Servicing Rights [Member] | Fair Value, Inputs, Level 3 [Member] | Minimum [Member] | Third Party Valuations [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Discount to reflect realizable value less estimated selling costs (in hundredths)	9.50%
Mortgage Servicing Rights [Member] | Fair Value, Inputs, Level 3 [Member] | Maximum [Member] | Third Party Valuations [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Discount to reflect realizable value less estimated selling costs (in hundredths)	12.50%
Mortgage Servicing Rights [Member] | Fair Value, Inputs, Level 3 [Member] | Weighted Average [Member] | Third Party Valuations [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Discount to reflect realizable value less estimated selling costs (in hundredths)	9.70%
Mortgage Servicing Rights [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	$ 1,444,000

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This element represents the fair value of interest payable.

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

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair value portion of federal funds sold and securities borrowed or purchased under agreements to resell.

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Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of 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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Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date of rights with an indefinite period of benefit that arose from a contractual arrangement with a third party (not including franchise rights and license agreements).

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Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity.

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Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

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