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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 18,101us-gaap_NetIncomeLoss		$ 19,876us-gaap_NetIncomeLoss	$ 19,543us-gaap_NetIncomeLoss
Change in fair value of derivative instruments:
Change in fair value of derivative instruments for the period	(511)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax		2,668us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	(579)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
Income tax effect	179us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax		(934)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	203us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax
Changes from derivative instruments	(332)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax		1,734us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	(376)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Change in securities available-for-sale:
Unrealized appreciation (depreciation) for the period on available-for-sale securities	4,841us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsAndTax		(18,956)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsAndTax	2,517us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsAndTax
Unrealized appreciation for the period on held-to-maturity	1,658us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesBeforeTax	[1]
Reclassification adjustment for securities gains realized in income	(988)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax		(374)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	(2)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Income tax effect	(1,929)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax		6,766us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	(880)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax
Unrealized gains (losses) on available-for-sale securities	3,582us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax		(12,564)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	1,635us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Other Comprehensive Income (Loss), Net of Tax	3,250us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent		(10,830)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1,259us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive Income	$ 21,351us-gaap_ComprehensiveIncomeNetOfTax		$ 9,046us-gaap_ComprehensiveIncomeNetOfTax	$ 20,802us-gaap_ComprehensiveIncomeNetOfTax
[1] The amortization of the unrealized holding gains in accumulated other comprehensive income at the date of the transfer partially offsets the accretion of the difference between the par value and the fair value of the investment securities at the date of the transfer.

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