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UNAUDITED QUARTERLY FINANCIAL INFORMATION (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
UNAUDITED QUARTERLY FINANCIAL INFORMATION
Total interest income	$ 37,741us-gaap_InterestAndDividendIncomeOperating	$ 37,139us-gaap_InterestAndDividendIncomeOperating	$ 37,536us-gaap_InterestAndDividendIncomeOperating	$ 37,393us-gaap_InterestAndDividendIncomeOperating	$ 37,133us-gaap_InterestAndDividendIncomeOperating	$ 35,558us-gaap_InterestAndDividendIncomeOperating	$ 34,992us-gaap_InterestAndDividendIncomeOperating	$ 32,595us-gaap_InterestAndDividendIncomeOperating	$ 149,809us-gaap_InterestAndDividendIncomeOperating	$ 140,278us-gaap_InterestAndDividendIncomeOperating	$ 128,445us-gaap_InterestAndDividendIncomeOperating
Total interest expense	1,557us-gaap_InterestExpense	1,607us-gaap_InterestExpense	1,630us-gaap_InterestExpense	1,597us-gaap_InterestExpense	1,637us-gaap_InterestExpense	1,787us-gaap_InterestExpense	1,819us-gaap_InterestExpense	1,926us-gaap_InterestExpense	6,391us-gaap_InterestExpense	7,169us-gaap_InterestExpense	8,734us-gaap_InterestExpense
Net interest income	36,184us-gaap_InterestIncomeExpenseNet	35,532us-gaap_InterestIncomeExpenseNet	35,906us-gaap_InterestIncomeExpenseNet	35,796us-gaap_InterestIncomeExpenseNet	35,496us-gaap_InterestIncomeExpenseNet	33,771us-gaap_InterestIncomeExpenseNet	33,173us-gaap_InterestIncomeExpenseNet	30,669us-gaap_InterestIncomeExpenseNet	143,418us-gaap_InterestIncomeExpenseNet	133,109us-gaap_InterestIncomeExpenseNet	119,711us-gaap_InterestIncomeExpenseNet
Provision (credit) for loan and lease losses	(5,371)us-gaap_ProvisionForLoanAndLeaseLosses	(1,722)us-gaap_ProvisionForLoanAndLeaseLosses	1,995us-gaap_ProvisionForLoanAndLeaseLosses	(1,316)us-gaap_ProvisionForLoanAndLeaseLosses	(1,333)us-gaap_ProvisionForLoanAndLeaseLosses	(3,189)us-gaap_ProvisionForLoanAndLeaseLosses	(227)us-gaap_ProvisionForLoanAndLeaseLosses	(6,561)us-gaap_ProvisionForLoanAndLeaseLosses	(6,414)us-gaap_ProvisionForLoanAndLeaseLosses	(11,310)us-gaap_ProvisionForLoanAndLeaseLosses	(18,885)us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for loan and lease losses	41,555us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	37,254us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	33,911us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	37,112us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	36,829us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	36,960us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	33,400us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	37,230us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	149,832us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	144,419us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	138,596us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
Investment securities gains			240us-gaap_GainLossOnSaleOfSecuritiesNet		482us-gaap_GainLossOnSaleOfSecuritiesNet				240us-gaap_GainLossOnSaleOfSecuritiesNet	482us-gaap_GainLossOnSaleOfSecuritiesNet	789us-gaap_GainLossOnSaleOfSecuritiesNet
Income before income taxes	19,018us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	13,471us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	13,027us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	15,326us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	13,731us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	12,378us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	16,212us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	17,507us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	60,842us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	59,828us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	47,421us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Net income	$ 13,265us-gaap_NetIncomeLoss	$ 8,230us-gaap_NetIncomeLoss	$ 9,150us-gaap_NetIncomeLoss	$ 9,808us-gaap_NetIncomeLoss	$ 10,295us-gaap_NetIncomeLoss	$ 10,204us-gaap_NetIncomeLoss	$ 14,267us-gaap_NetIncomeLoss	$ 137,309us-gaap_NetIncomeLoss	$ 40,453us-gaap_NetIncomeLoss	$ 172,075us-gaap_NetIncomeLoss	$ 47,421us-gaap_NetIncomeLoss
Basic earnings per share (in dollars per share)	$ 0.37us-gaap_EarningsPerShareBasic	$ 0.23us-gaap_EarningsPerShareBasic	$ 0.25us-gaap_EarningsPerShareBasic	$ 0.23us-gaap_EarningsPerShareBasic	$ 0.24us-gaap_EarningsPerShareBasic	$ 0.24us-gaap_EarningsPerShareBasic	$ 0.34us-gaap_EarningsPerShareBasic	$ 3.28us-gaap_EarningsPerShareBasic	$ 1.08us-gaap_EarningsPerShareBasic	$ 4.10us-gaap_EarningsPerShareBasic	$ 1.14us-gaap_EarningsPerShareBasic
Diluted earnings per share (in dollars per share)	$ 0.37us-gaap_EarningsPerShareDiluted	$ 0.23us-gaap_EarningsPerShareDiluted	$ 0.25us-gaap_EarningsPerShareDiluted	$ 0.23us-gaap_EarningsPerShareDiluted	$ 0.24us-gaap_EarningsPerShareDiluted	$ 0.24us-gaap_EarningsPerShareDiluted	$ 0.34us-gaap_EarningsPerShareDiluted	$ 3.25us-gaap_EarningsPerShareDiluted	$ 1.07us-gaap_EarningsPerShareDiluted	$ 4.07us-gaap_EarningsPerShareDiluted	$ 1.13us-gaap_EarningsPerShareDiluted

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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