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SUPPLEMENTARY 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
Fee revenue and other income	$ 20,157us-gaap_NoninterestIncome	$ 20,223us-gaap_NoninterestIncome	$ 19,952us-gaap_NoninterestIncome	$ 19,575us-gaap_NoninterestIncome	$ 18,845us-gaap_NoninterestIncome	$ 19,695us-gaap_NoninterestIncome	$ 19,567us-gaap_NoninterestIncome	$ 18,465us-gaap_NoninterestIncome	$ 79,907us-gaap_NoninterestIncome	$ 76,572us-gaap_NoninterestIncome	$ 71,138us-gaap_NoninterestIncome
Interest income	10,021us-gaap_InterestAndDividendIncomeOperating	9,991us-gaap_InterestAndDividendIncomeOperating	9,975us-gaap_InterestAndDividendIncomeOperating	9,772us-gaap_InterestAndDividendIncomeOperating	10,016us-gaap_InterestAndDividendIncomeOperating	10,082us-gaap_InterestAndDividendIncomeOperating	10,623us-gaap_InterestAndDividendIncomeOperating	10,856us-gaap_InterestAndDividendIncomeOperating	39,759us-gaap_InterestAndDividendIncomeOperating	41,577us-gaap_InterestAndDividendIncomeOperating	45,933us-gaap_InterestAndDividendIncomeOperating
Interest expense	603us-gaap_InterestExpense	604us-gaap_InterestExpense	628us-gaap_InterestExpense	625us-gaap_InterestExpense	729us-gaap_InterestExpense	722us-gaap_InterestExpense	694us-gaap_InterestExpense	687us-gaap_InterestExpense	2,460us-gaap_InterestExpense	2,832us-gaap_InterestExpense	3,148us-gaap_InterestExpense
Net interest income	9,418us-gaap_InterestIncomeExpenseNet	9,387us-gaap_InterestIncomeExpenseNet	9,347us-gaap_InterestIncomeExpenseNet	9,147us-gaap_InterestIncomeExpenseNet	9,287us-gaap_InterestIncomeExpenseNet	9,360us-gaap_InterestIncomeExpenseNet	9,929us-gaap_InterestIncomeExpenseNet	10,169us-gaap_InterestIncomeExpenseNet	37,299us-gaap_InterestIncomeExpenseNet	38,745us-gaap_InterestIncomeExpenseNet	42,785us-gaap_InterestIncomeExpenseNet
Provision for loan losses							300us-gaap_ProvisionForLoanLossesExpensed	200us-gaap_ProvisionForLoanLossesExpensed		500us-gaap_ProvisionForLoanLossesExpensed	2,400us-gaap_ProvisionForLoanLossesExpensed
Operating expense	21,887us-gaap_NoninterestExpense	21,196us-gaap_NoninterestExpense	21,306us-gaap_NoninterestExpense	21,025us-gaap_NoninterestExpense	21,296us-gaap_NoninterestExpense	21,384us-gaap_NoninterestExpense	21,017us-gaap_NoninterestExpense	20,389us-gaap_NoninterestExpense	85,414us-gaap_NoninterestExpense	84,086us-gaap_NoninterestExpense	80,333us-gaap_NoninterestExpense
Income tax expense	1,902us-gaap_IncomeTaxExpenseBenefit	2,013us-gaap_IncomeTaxExpenseBenefit	1,958us-gaap_IncomeTaxExpenseBenefit	1,886us-gaap_IncomeTaxExpenseBenefit	1,582us-gaap_IncomeTaxExpenseBenefit	1,533us-gaap_IncomeTaxExpenseBenefit	2,106us-gaap_IncomeTaxExpenseBenefit	2,013us-gaap_IncomeTaxExpenseBenefit	7,759us-gaap_IncomeTaxExpenseBenefit	7,234us-gaap_IncomeTaxExpenseBenefit	7,887us-gaap_IncomeTaxExpenseBenefit
Net income	$ 5,786us-gaap_NetIncomeLoss	$ 6,401us-gaap_NetIncomeLoss	$ 6,035us-gaap_NetIncomeLoss	$ 5,811us-gaap_NetIncomeLoss	$ 5,254us-gaap_NetIncomeLoss	$ 6,138us-gaap_NetIncomeLoss	$ 6,073us-gaap_NetIncomeLoss	$ 6,032us-gaap_NetIncomeLoss	$ 24,033us-gaap_NetIncomeLoss	$ 23,497us-gaap_NetIncomeLoss	$ 23,303us-gaap_NetIncomeLoss
Net income per share:
Basic earnings per share	$ 0.50us-gaap_EarningsPerShareBasic	$ 0.56us-gaap_EarningsPerShareBasic	$ 0.52us-gaap_EarningsPerShareBasic	$ 0.51us-gaap_EarningsPerShareBasic	$ 0.45us-gaap_EarningsPerShareBasic	$ 0.54us-gaap_EarningsPerShareBasic	$ 0.53us-gaap_EarningsPerShareBasic	$ 0.53us-gaap_EarningsPerShareBasic	$ 2.09us-gaap_EarningsPerShareBasic	$ 2.05us-gaap_EarningsPerShareBasic	$ 2.05us-gaap_EarningsPerShareBasic
Diluted earnings per share	$ 0.49us-gaap_EarningsPerShareDiluted	$ 0.55us-gaap_EarningsPerShareDiluted	$ 0.52us-gaap_EarningsPerShareDiluted	$ 0.50us-gaap_EarningsPerShareDiluted	$ 0.45us-gaap_EarningsPerShareDiluted	$ 0.53us-gaap_EarningsPerShareDiluted	$ 0.52us-gaap_EarningsPerShareDiluted	$ 0.52us-gaap_EarningsPerShareDiluted	$ 2.06us-gaap_EarningsPerShareDiluted	$ 2.02us-gaap_EarningsPerShareDiluted	$ 2.02us-gaap_EarningsPerShareDiluted

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