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Quarterly Results of Operations (Unaudited) - Summary of Quarterly Consolidated Results of Operations (Detail) (USD $) In Thousands, except 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
Quarterly Financial Information Disclosure [Abstract]
Interest income	$ 19,765us-gaap_InterestAndDividendIncomeOperating	$ 19,851us-gaap_InterestAndDividendIncomeOperating	$ 20,122us-gaap_InterestAndDividendIncomeOperating	$ 16,467us-gaap_InterestAndDividendIncomeOperating	$ 17,436us-gaap_InterestAndDividendIncomeOperating	$ 18,041us-gaap_InterestAndDividendIncomeOperating	$ 19,977us-gaap_InterestAndDividendIncomeOperating	$ 19,429us-gaap_InterestAndDividendIncomeOperating	$ 76,205us-gaap_InterestAndDividendIncomeOperating	$ 74,886us-gaap_InterestAndDividendIncomeOperating	$ 72,528us-gaap_InterestAndDividendIncomeOperating
Interest expense	3,242us-gaap_InterestExpense	3,451us-gaap_InterestExpense	3,334us-gaap_InterestExpense	3,195us-gaap_InterestExpense	3,310us-gaap_InterestExpense	3,372us-gaap_InterestExpense	3,402us-gaap_InterestExpense	3,419us-gaap_InterestExpense	13,222us-gaap_InterestExpense	13,503us-gaap_InterestExpense	14,322us-gaap_InterestExpense
Net interest income	16,523us-gaap_InterestIncomeExpenseNet	16,400us-gaap_InterestIncomeExpenseNet	16,788us-gaap_InterestIncomeExpenseNet	13,272us-gaap_InterestIncomeExpenseNet	14,126us-gaap_InterestIncomeExpenseNet	14,669us-gaap_InterestIncomeExpenseNet	16,575us-gaap_InterestIncomeExpenseNet	16,010us-gaap_InterestIncomeExpenseNet	62,983us-gaap_InterestIncomeExpenseNet	61,383us-gaap_InterestIncomeExpenseNet	58,206us-gaap_InterestIncomeExpenseNet
Provision for loan losses	978us-gaap_ProvisionForLoanAndLeaseLosses	1,741us-gaap_ProvisionForLoanAndLeaseLosses	339us-gaap_ProvisionForLoanAndLeaseLosses		(997)us-gaap_ProvisionForLoanAndLeaseLosses	104us-gaap_ProvisionForLoanAndLeaseLosses	729us-gaap_ProvisionForLoanAndLeaseLosses	2,084us-gaap_ProvisionForLoanAndLeaseLosses	3,058us-gaap_ProvisionForLoanAndLeaseLosses	1,920us-gaap_ProvisionForLoanAndLeaseLosses	3,524us-gaap_ProvisionForLoanAndLeaseLosses
Gain on sale of securities		988us-gaap_GainLossOnSaleOfSecuritiesNet				6us-gaap_GainLossOnSaleOfSecuritiesNet		368us-gaap_GainLossOnSaleOfSecuritiesNet	988us-gaap_GainLossOnSaleOfSecuritiesNet	374us-gaap_GainLossOnSaleOfSecuritiesNet	2us-gaap_GainLossOnSaleOfSecuritiesNet
Net income	4,948us-gaap_NetIncomeLoss	4,958us-gaap_NetIncomeLoss	4,778us-gaap_NetIncomeLoss	3,417us-gaap_NetIncomeLoss	4,115us-gaap_NetIncomeLoss	4,785us-gaap_NetIncomeLoss	5,665us-gaap_NetIncomeLoss	5,311us-gaap_NetIncomeLoss	18,101us-gaap_NetIncomeLoss	19,876us-gaap_NetIncomeLoss	19,543us-gaap_NetIncomeLoss
Net income available to common shareholders	$ 4,917us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 4,918us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 4,747us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 3,386us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 4,052us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 4,719us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 5,569us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 5,165us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 17,968us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 19,506us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 19,062us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Earnings per share:
Basic	$ 0.53us-gaap_EarningsPerShareBasic	$ 0.53us-gaap_EarningsPerShareBasic	$ 0.52us-gaap_EarningsPerShareBasic	$ 0.39us-gaap_EarningsPerShareBasic	$ 0.47us-gaap_EarningsPerShareBasic	$ 0.55us-gaap_EarningsPerShareBasic	$ 0.65us-gaap_EarningsPerShareBasic	$ 0.60us-gaap_EarningsPerShareBasic	$ 1.98us-gaap_EarningsPerShareBasic	$ 2.26us-gaap_EarningsPerShareBasic	$ 2.39us-gaap_EarningsPerShareBasic
Diluted	$ 0.51us-gaap_EarningsPerShareDiluted	$ 0.51us-gaap_EarningsPerShareDiluted	$ 0.50us-gaap_EarningsPerShareDiluted	$ 0.38us-gaap_EarningsPerShareDiluted	$ 0.45us-gaap_EarningsPerShareDiluted	$ 0.52us-gaap_EarningsPerShareDiluted	$ 0.62us-gaap_EarningsPerShareDiluted	$ 0.58us-gaap_EarningsPerShareDiluted	$ 1.90us-gaap_EarningsPerShareDiluted	$ 2.17us-gaap_EarningsPerShareDiluted	$ 2.30us-gaap_EarningsPerShareDiluted
Average shares outstanding:
Basic	9,212,156us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	9,208,707us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	9,182,986us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,630,966us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,623,360us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,618,969us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,617,466us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,617,466us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	9,060,702us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,619,330us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	7,974,241us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted	9,628,240us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,588,332us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,560,939us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,021,786us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,020,289us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,019,211us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	8,974,103us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	8,980,655us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,454,125us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,000,963us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	8,271,177us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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