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Fair Market Value of Financial Assets and Liabilities, Estimated Fair Value of Financial Instruments and Indication of Level Within Fair Value Hierarchy of Valuation Techniques (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financial assets [Abstract]
Securities available-for-sale	$ 599,844	$ 593,746
Securities held-to-maturity	517	649
Equity securities at fair value	1,953	1,173
Mortgage servicing rights	3,263	3,607	$ 3,484	$ 3,433
Carrying Amount [Member]
Financial assets [Abstract]
Cash and cash equivalents	264,683	141,450
Certificates of deposits in other banks	245	3,920
Securities available-for-sale	599,844	593,746
Securities held-to-maturity	517	649
Equity securities at fair value	1,953	1,173
Loans held for sale	1,167	2,461
Loans, net	3,213,568	3,172,730
Federal Home Loan Bank stock	10,474	14,713
Federal Reserve Bank stock	4,887	4,887
Accrued interest receivable	14,836	14,432
Mortgage servicing rights	3,263	3,607
Financial liabilities [Abstract]
Deposits	3,405,572	3,305,950
Repurchase agreements	226,917	232,712
Federal funds purchased	7,906	1,180
Advances from Federal Home Loan Bank	415	436
Long-term debt	57,841	59,341
Accrued interest payable	2,839	2,902
Unrecognized financial instruments [Abstract]
Letters of credit	0
Commitments to extend credit	0	0
Forward sale commitments	0	0
Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets [Abstract]
Cash and cash equivalents	264,683	141,450
Certificates of deposits in other banks	0	0
Securities available-for-sale	54,263	91,028
Securities held-to-maturity	0	0
Equity securities at fair value	0	0
Loans held for sale	1,191	2,518
Loans, net	0	0
Federal Home Loan Bank stock	0	0
Federal Reserve Bank stock	0	0
Accrued interest receivable	0	0
Mortgage servicing rights	0	0
Financial liabilities [Abstract]
Deposits	865,760	803,316
Repurchase agreements	0	0
Federal funds purchased	0	0
Advances from Federal Home Loan Bank	0	0
Long-term debt	0	0
Accrued interest payable	0	0
Unrecognized financial instruments [Abstract]
Letters of credit	0
Commitments to extend credit	0	0
Forward sale commitments	0	0
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets [Abstract]
Cash and cash equivalents	0	0
Certificates of deposits in other banks	245	3,914
Securities available-for-sale	545,581	502,718
Securities held-to-maturity	517	649
Equity securities at fair value	0	0
Loans held for sale	0	0
Loans, net	0	0
Federal Home Loan Bank stock	10,474	14,713
Federal Reserve Bank stock	4,887	4,887
Accrued interest receivable	14,836	14,432
Mortgage servicing rights	0	0
Financial liabilities [Abstract]
Deposits	2,560,271	2,513,084
Repurchase agreements	0	0
Federal funds purchased	7,906	1,180
Advances from Federal Home Loan Bank	446	468
Long-term debt	0	0
Accrued interest payable	2,839	2,902
Unrecognized financial instruments [Abstract]
Letters of credit	0
Commitments to extend credit	0	0
Forward sale commitments	0	0
Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets [Abstract]
Cash and cash equivalents	0	0
Certificates of deposits in other banks	0	0
Securities available-for-sale	0	0
Securities held-to-maturity	0	0
Equity securities at fair value	1,953	1,173
Loans held for sale	0	0
Loans, net	3,283,876	3,175,908
Federal Home Loan Bank stock	0	0
Federal Reserve Bank stock	0	0
Accrued interest receivable	0	0
Mortgage servicing rights	3,263	3,607
Financial liabilities [Abstract]
Deposits	0	0
Repurchase agreements	226,921	232,796
Federal funds purchased	0	0
Advances from Federal Home Loan Bank	0	0
Long-term debt	49,382	44,166
Accrued interest payable	0	0
Unrecognized financial instruments [Abstract]
Letters of credit	0
Commitments to extend credit	0	0
Forward sale commitments	$ 0	$ 0

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- Definition

This item represents management's methodology (for example, procedures or techniques) for estimating the fair value as of the balance sheet date of the financial instrument (as defined), including financial assets and financial liabilities (collectively, as defined).

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Amount 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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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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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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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Fair value portion of short term borrowing where a bank borrows, at the federal funds rate, from another bank and securities that an entity sells and agrees to repurchase at a specified date for a specified price.

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

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

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

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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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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Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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