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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, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financial assets [Abstract]
Securities available-for-sale	$ 585,761	$ 605,394
Securities held-to-maturity	660	867
Mortgage servicing rights	3,484	3,433	$ 3,236	$ 2,968
Carrying Amount [Member]
Financial assets [Abstract]
Cash and cash equivalents	175,274	144,716
Certificates of deposits in other banks	9,800	980
Securities available-for-sale	585,761	605,394
Securities held-to-maturity	659	866
Loans held for sale	1,033	1,244
Loans, net	3,086,789	2,902,438
Federal Home Loan Bank stock	17,927	17,927
Federal Reserve Bank stock	4,887	4,887
Accrued interest receivable	13,338	11,922
Mortgage servicing rights	3,484	3,433
Financial liabilities [Abstract]
Deposits	3,263,863	3,081,308
Repurchase agreements	243,814	251,065
Federal funds purchased	7,312	4,816
Advances from Federal Home Loan Bank	845	944
Long-term debt	59,341	61,341
Accrued interest payable	2,228	1,200
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	175,274	144,716
Certificates of deposits in other banks	0	0
Securities available-for-sale	88,956	69,292
Securities held-to-maturity	0	0
Loans held for sale	1,060	1,260
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	790,930	767,918
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	9,772	982
Securities available-for-sale	496,805	536,102
Securities held-to-maturity	660	867
Loans held for sale	0	0
Loans, net	0	0
Federal Home Loan Bank stock	17,927	17,927
Federal Reserve Bank stock	4,887	4,887
Accrued interest receivable	13,338	11,922
Mortgage servicing rights	0	0
Financial liabilities [Abstract]
Deposits	2,319,278	2,321,690
Repurchase agreements	0	0
Federal funds purchased	7,312	4,816
Advances from Federal Home Loan Bank	841	1,009
Long-term debt	0	0
Accrued interest payable	2,228	1,200
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
Loans held for sale	0	0
Loans, net	3,092,437	2,882,348
Federal Home Loan Bank stock	0	0
Federal Reserve Bank stock	0	0
Accrued interest receivable	0	0
Mortgage servicing rights	3,484	3,433
Financial liabilities [Abstract]
Deposits	0	0
Repurchase agreements	243,932	250,820
Federal funds purchased	0	0
Advances from Federal Home Loan Bank	0	0
Long-term debt	44,166	49,073
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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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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- Definition

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

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Fair value of investments in debt securities classified as held-to-maturity.

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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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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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