Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 14,613us-gaap_NetIncomeLoss	$ 13,183us-gaap_NetIncomeLoss	$ 12,466us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of premises and equipment	1,629us-gaap_DepreciationNonproduction	1,504us-gaap_DepreciationNonproduction	1,292us-gaap_DepreciationNonproduction
Amortization of core deposit intangible	92us-gaap_AmortizationOfIntangibleAssets	92us-gaap_AmortizationOfIntangibleAssets	36us-gaap_AmortizationOfIntangibleAssets
Provision for loan losses	1,833us-gaap_ProvisionForLoanAndLeaseLosses	1,418us-gaap_ProvisionForLoanAndLeaseLosses	1,652us-gaap_ProvisionForLoanAndLeaseLosses
Net securities gains	(403)us-gaap_GainLossOnSaleOfSecuritiesNet	(676)us-gaap_GainLossOnSaleOfSecuritiesNet	(1,938)us-gaap_GainLossOnSaleOfSecuritiesNet
Other-than-temporary impairment		249us-gaap_OtherAssetImpairmentCharges	853us-gaap_OtherAssetImpairmentCharges
Net amortization of bond premiums and discounts	2,776	5,076	4,133
Deferred tax benefit	240us-gaap_DeferredIncomeTaxExpenseBenefit	(111)us-gaap_DeferredIncomeTaxExpenseBenefit	(83)us-gaap_DeferredIncomeTaxExpenseBenefit
Recognition of stock based expense	418us-gaap_StockOptionPlanExpense	265us-gaap_StockOptionPlanExpense	216us-gaap_StockOptionPlanExpense
Gains on sale of other real estate owned		(53)	(37)
Net change in other assets	(6,213)	752	711
Net change in other liabilities	546	(139)	1,790
Net cash provided by operating activities	15,531	21,560	21,091
Cash flows from investing activities:
Net cash received in acquisition			1,197us-gaap_CashAcquiredFromAcquisition
Purchases of securities available for sale	(110,239)	(172,131)	(167,358)
Proceeds from maturities, calls and principal paydowns of mortgage-backed securities	73,854	94,382	93,984
Proceeds from sales of securities available for sale	37,278	17,234	39,304
Net increase in Federal Home Loan Bank stock	(2,984)	(181)	(1,351)
Net loans made to customers	(67,186)	(38,632)	(55,083)
Proceeds from sale of other real estate owned	1,129	1,084	831
Capital expenditures	(2,002)	(2,394)	(3,894)
Net cash used in investing activities	(70,150)	(100,638)	(92,370)
Cash flows from financing activities:
Net increase in deposits	22,398us-gaap_IncreaseDecreaseInDeposits	39,886us-gaap_IncreaseDecreaseInDeposits	33,602us-gaap_IncreaseDecreaseInDeposits
Net decrease in securities sold under repurchase agreements and fed funds repurchased	(535)	(381)	(3,992)
Proceeds from Federal Home Loan Bank advances	92,100	82,900	90,796
Repayments of Federal Home Loan Bank advances	(53,990)	(44,641)	(39,296)
Purchase of Treasury Stock	(8)	(24)	(181)
Proceeds from stock option exercises, including excess tax benefits	616	461	1,187
Payments of dividends	(5,362)us-gaap_PaymentsOfDividendsCommonStock	(4,915)us-gaap_PaymentsOfDividendsCommonStock	(4,565)us-gaap_PaymentsOfDividendsCommonStock
Net cash provided by financing activities	55,219	73,286	77,551
Net increase (decrease) in cash and cash equivalents	600	(5,792)	6,272
Cash and cash equivalents at beginning of period	9,200	14,992	8,720
Cash and cash equivalents at end of period	9,800	9,200	14,992
Supplemental disclosures of cash flow information:
Interest	9,920us-gaap_InterestPaidNet	11,833us-gaap_InterestPaidNet	14,011us-gaap_InterestPaidNet
Income taxes	6,237us-gaap_IncomeTaxesPaidNet	4,514us-gaap_IncomeTaxesPaidNet	4,323us-gaap_IncomeTaxesPaidNet
Schedule of noncash investing activities:
Transfers from loans to other real estate owned	320us-gaap_TransferOfOtherRealEstate	261us-gaap_TransferOfOtherRealEstate	1,058us-gaap_TransferOfOtherRealEstate
Acquisitions:
Fair value of non cash assets acquired			41,576us-gaap_FairValueOfAssetsAcquired
Fair value of liabilities assumed			$ (42,773)us-gaap_LiabilitiesAssumed1

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The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.