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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, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financial assets [Abstract]
Securities available-for-sale	$ 593,746	$ 585,761
Securities held-to-maturity	649	660
Equity securities at fair value	1,173	0
Mortgage servicing rights	3,607	3,484	$ 3,433	$ 3,236
Carrying Amount [Member]
Financial assets [Abstract]
Cash and cash equivalents	141,450	175,274
Certificates of deposits in other banks	3,920	9,800
Securities available-for-sale	593,746	585,761
Securities held-to-maturity	649	659
Equity securities at fair value	1,173
Loans held for sale	2,461	1,033
Loans, net	3,172,730	3,086,789
Federal Home Loan Bank stock	14,713	17,927
Federal Reserve Bank stock	4,887	4,887
Accrued interest receivable	14,432	13,338
Mortgage servicing rights	3,607	3,484
Financial liabilities [Abstract]
Deposits	3,305,950	3,263,863
Repurchase agreements	232,712	243,814
Federal funds purchased	1,180	7,312
Advances from Federal Home Loan Bank	436	845
Long-term debt	59,341	59,341
Accrued interest payable	2,902	2,228
Unrecognized financial instruments [Abstract]
Letters of credit	0	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	141,450	175,274
Certificates of deposits in other banks	0	0
Securities available-for-sale	91,028	88,956
Securities held-to-maturity	0	0
Equity securities at fair value	0
Loans held for sale	2,518	1,060
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	803,316	790,930
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	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	3,914	9,772
Securities available-for-sale	502,718	496,805
Securities held-to-maturity	649	660
Equity securities at fair value	0
Loans held for sale	0	0
Loans, net	0	0
Federal Home Loan Bank stock	14,713	17,927
Federal Reserve Bank stock	4,887	4,887
Accrued interest receivable	14,432	13,338
Mortgage servicing rights	0	0
Financial liabilities [Abstract]
Deposits	2,513,084	2,319,278
Repurchase agreements	0	0
Federal funds purchased	1,180	7,312
Advances from Federal Home Loan Bank	468	841
Long-term debt	0	0
Accrued interest payable	2,902	2,228
Unrecognized financial instruments [Abstract]
Letters of credit	0	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	1,173
Loans held for sale	0	0
Loans, net	3,175,908	3,092,437
Federal Home Loan Bank stock	0	0
Federal Reserve Bank stock	0	0
Accrued interest receivable	0	0
Mortgage servicing rights	3,607	3,484
Financial liabilities [Abstract]
Deposits	0	0
Repurchase agreements	232,796	243,932
Federal funds purchased	0	0
Advances from Federal Home Loan Bank	0	0
Long-term debt	44,166	44,166
Accrued interest payable	0	0
Unrecognized financial instruments [Abstract]
Letters of credit	0	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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No definition available.

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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 represents commitments to extend credit as of the balance sheet date.

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- Definition

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 represents forward sale commitments of the balance sheet date.

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Fair value portion of trade and related party payables and accrued expenses.

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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 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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No definition available.

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

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- Definition

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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No definition available.

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-SubTopic 210
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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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