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

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