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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, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financial assets [Abstract]
Securities available-for-sale	$ 594,936	$ 640,186
Securities held-to-maturity	1,651	1,644
Mortgage servicing rights	3,236	2,968	$ 3,424	$ 2,364
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets [Abstract]
Cash and cash equivalents	187,611	105,517
Certificates of deposits in other banks	0	0
Securities available-for-sale	69,453	25,381
Securities held-to-maturity	0	0
Loans held for sale	1,196	2,321
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	749,975	677,626
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
Significant Other Observable Inputs (Level 2) [Member]
Financial assets [Abstract]
Cash and cash equivalents	0	0
Certificates of deposits in other banks	3,836	8,213
Securities available-for-sale	525,483	614,805
Securities held-to-maturity	1,651	1,644
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	4,869
Accrued interest receivable	12,194	13,548
Mortgage servicing rights	0	0
Financial liabilities [Abstract]
Deposits	2,208,120	2,192,848
Repurchase agreements	0	0
Federal funds purchased	3,596	11,041
Advances from Federal Home Loan Bank	100,905	61,106
Long-term debt	0	0
Accrued interest payable	1,071	908
Unrecognized financial instruments [Abstract]
Letters of credit	0	0
Commitments to extend credit	0	0
Forward sale commitments	0	0
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	2,833,267	2,691,906
Federal Home Loan Bank stock	0	0
Federal Reserve Bank stock	0	0
Accrued interest receivable	0	0
Mortgage servicing rights	3,236	2,968
Financial liabilities [Abstract]
Deposits	0	0
Repurchase agreements	250,873	235,193
Federal funds purchased	0	0
Advances from Federal Home Loan Bank	0	0
Long-term debt	49,073	35,615
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
Carrying Amount [Member]
Financial assets [Abstract]
Cash and cash equivalents	187,611	105,517
Certificates of deposits in other banks	3,832	8,197
Securities available-for-sale	594,936	640,186
Securities held-to-maturity	1,661	1,662
Loans held for sale	1,172	2,264
Loans, net	2,837,867	2,699,377
Federal Home Loan Bank stock	17,927	17,927
Federal Reserve Bank stock	4,887	4,869
Accrued interest receivable	12,194	13,548
Mortgage servicing rights	3,236	2,968
Financial liabilities [Abstract]
Deposits	2,980,782	2,874,257
Repurchase agreements	251,225	235,186
Federal funds purchased	3,596	11,041
Advances from Federal Home Loan Bank	101,056	61,170
Long-term debt	61,341	61,341
Accrued interest payable	1,071	908
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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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

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This item represents management's methodology (for example, procedures or techniques) for estimating the fair value as of the balance sheet date of federal reserve bank stock.

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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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- 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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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 of investments in debt securities classified as 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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