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Fair Value of Financial Assets and Liabilities, Estimated Fair Value Of Financial Instruments and Indication of Level Within Fair Value Hierarachy of Valuation Techniques (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale	$ 621,230	$ 527,398
Mortgage servicing rights	2,281	2,282
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	202,541	238,481
Certificates of deposits in other banks	0	0
Securities available-for-sale	36,269	21,182
Securities held-to-maturity	0	0
Loans held for sale	788	550
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	599,984	584,735
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]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Certificates of deposits in other banks	8,795	11,860
Securities available-for-sale	584,750	506,005
Securities held-to-maturity	1,662	1,661
Loans held for sale	0	0
Loans, net	0	0
Federal Home Loan Bank stock	25,673	25,673
Federal Reserve Bank stock	4,885	4,883
Accrued interest receivable	13,394	12,280
Mortgage servicing rights	0	0
Financial liabilities: [Abstract]
Deposits	2,312,129	2,294,987
Repurchase agreements	0	0
Federal funds purchased	8,821	13,104
Advances from Federal Home Loan Bank	1,774	21,617
Long-term debt	0	0
Accrued interest payable	5,127	2,171
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]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Certificates of deposits in other banks	0	0
Securities available-for-sale	211	211
Securities held-to-maturity	0	0
Loans held for sale	0	0
Loans, net	2,540,421	2,520,297
Federal Home Loan Bank stock	0	0
Federal Reserve Bank stock	0	0
Accrued interest receivable	0	0
Mortgage servicing rights	2,281	2,282
Financial liabilities: [Abstract]
Deposits	0	0
Repurchase agreements	218,475	217,062
Federal funds purchased	0	0
Advances from Federal Home Loan Bank	0	0
Long-term debt	31,144	31,030
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]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	202,541	238,481
Certificates of deposits in other banks	8,758	11,875
Securities available-for-sale	621,230	527,398
Securities held-to-maturity	1,662	1,662
Loans held for sale	771	536
Loans, net	2,518,348	2,523,377
Federal Home Loan Bank stock	25,673	25,673
Federal Reserve Bank stock	4,885	4,883
Accrued interest receivable	13,394	12,280
Mortgage servicing rights	2,281	2,282
Financial liabilities: [Abstract]
Deposits	2,911,844	2,878,359
Repurchase agreements	218,511	217,177
Federal funds purchased	8,821	13,104
Advances from Federal Home Loan Bank	1,472	21,609
Long-term debt	61,341	61,341
Accrued interest payable	5,127	2,171
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 Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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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 the amount that a bank with insufficient reserves at a Federal Reserve Bank borrows, at the federal funds rate, from another bank to meet its reserve requirements for that day and the amount of securities that an institution sells and agrees to repurchase at a specified date for a specified price, net of any reductions or offsets.

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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 investments in debt securities which are categorized as held-to-maturity and that have scheduled maturities more than one year from the balance sheet date or operating cycle, if longer; such investments are normally measured at amortized cost (carrying value) unless circumstances indicate that the value to be recovered from the investment is less than its carried amount. The held-to-maturity category is for those securities that the Company has the positive intent and ability to hold until maturity.

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-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 20

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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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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-Number AAG-DEP

-Paragraph 4

-IssueDate 2006-05-01

-Chapter 14

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

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-Name FASB Staff Position (FSP)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Name Statement of Financial Accounting Standard (FAS)

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-Name Accounting Standards Codification

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