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Selected Quarterly Financial Data (Unaudited) - Summary of the Unaudited Quarterly Results of Operations (Detail) (USD $) In Thousands, except Per 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] |  |  |  |  |  |  |  |  |  |  |
Net interest income | $ 47,319 us-gaap_InterestIncomeExpenseNet | $ 46,514 us-gaap_InterestIncomeExpenseNet | $ 45,489 us-gaap_InterestIncomeExpenseNet | $ 42,029 us-gaap_InterestIncomeExpenseNet | $ 41,921 us-gaap_InterestIncomeExpenseNet | $ 40,712 us-gaap_InterestIncomeExpenseNet | $ 40,630 us-gaap_InterestIncomeExpenseNet | $ 40,256 us-gaap_InterestIncomeExpenseNet | $ 181,351 us-gaap_InterestIncomeExpenseNet | $ 163,519 us-gaap_InterestIncomeExpenseNet | $ 164,815 us-gaap_InterestIncomeExpenseNet
Provision for loan losses | 1,840 us-gaap_ProvisionForLoanAndLeaseLosses | (3,115)us-gaap_ProvisionForLoanAndLeaseLosses | 3,129 us-gaap_ProvisionForLoanAndLeaseLosses | 1,218 us-gaap_ProvisionForLoanAndLeaseLosses | 454 us-gaap_ProvisionForLoanAndLeaseLosses | (12)us-gaap_ProvisionForLoanAndLeaseLosses | 516 us-gaap_ProvisionForLoanAndLeaseLosses | 300 us-gaap_ProvisionForLoanAndLeaseLosses | 3,072 us-gaap_ProvisionForLoanAndLeaseLosses | 1,258 us-gaap_ProvisionForLoanAndLeaseLosses | 3,100 us-gaap_ProvisionForLoanAndLeaseLosses
Securities transactions | 822 us-gaap_GainLossOnSaleOfSecuritiesNet | 284 us-gaap_GainLossOnSaleOfSecuritiesNet | 85 us-gaap_GainLossOnSaleOfSecuritiesNet | 450 us-gaap_GainLossOnSaleOfSecuritiesNet | 79 us-gaap_GainLossOnSaleOfSecuritiesNet | 90 us-gaap_GainLossOnSaleOfSecuritiesNet | 129 us-gaap_GainLossOnSaleOfSecuritiesNet | 122 us-gaap_GainLossOnSaleOfSecuritiesNet | 1,641 us-gaap_GainLossOnSaleOfSecuritiesNet | 420 us-gaap_GainLossOnSaleOfSecuritiesNet | 4,915 us-gaap_GainLossOnSaleOfSecuritiesNet
Noninterest income | 24,302 us-gaap_NoninterestIncome | 24,938 us-gaap_NoninterestIncome | 23,611 us-gaap_NoninterestIncome | 23,562 us-gaap_NoninterestIncome | 22,235 us-gaap_NoninterestIncome | 23,652 us-gaap_NoninterestIncome | 21,733 us-gaap_NoninterestIncome | 22,535 us-gaap_NoninterestIncome | 96,413 us-gaap_NoninterestIncome | 90,155 us-gaap_NoninterestIncome | 87,717 us-gaap_NoninterestIncome
Noninterest expense | 46,886 us-gaap_NoninterestExpense | 46,942 us-gaap_NoninterestExpense | 45,857 us-gaap_NoninterestExpense | 43,836 us-gaap_NoninterestExpense | 43,854 us-gaap_NoninterestExpense | 43,321 us-gaap_NoninterestExpense | 42,455 us-gaap_NoninterestExpense | 41,944 us-gaap_NoninterestExpense | 183,521 us-gaap_NoninterestExpense | 171,574 us-gaap_NoninterestExpense | 170,428 us-gaap_NoninterestExpense
Net income | $ 15,749 us-gaap_NetIncomeLoss | $ 18,793 us-gaap_NetIncomeLoss | $ 14,688 us-gaap_NetIncomeLoss | $ 14,657 us-gaap_NetIncomeLoss | $ 13,861 us-gaap_NetIncomeLoss | $ 14,491 us-gaap_NetIncomeLoss | $ 12,593 us-gaap_NetIncomeLoss | $ 13,372 us-gaap_NetIncomeLoss | $ 63,887 us-gaap_NetIncomeLoss | $ 54,317 us-gaap_NetIncomeLoss | $ 51,900 us-gaap_NetIncomeLoss
Net income per common share: |  |  |  |  |  |  |  |  |  |  |
Basic | $ 1.02 us-gaap_EarningsPerShareBasic | $ 1.22 us-gaap_EarningsPerShareBasic | $ 0.94 us-gaap_EarningsPerShareBasic | $ 0.96 us-gaap_EarningsPerShareBasic | $ 0.91 us-gaap_EarningsPerShareBasic | $ 0.94 us-gaap_EarningsPerShareBasic | $ 0.83 us-gaap_EarningsPerShareBasic | $ 0.88 us-gaap_EarningsPerShareBasic | $ 4.14 us-gaap_EarningsPerShareBasic | $ 3.56 us-gaap_EarningsPerShareBasic | $ 3.42 us-gaap_EarningsPerShareBasic
Diluted | $ 0.99 us-gaap_EarningsPerShareDiluted | $ 1.19 us-gaap_EarningsPerShareDiluted | $ 0.92 us-gaap_EarningsPerShareDiluted | $ 0.94 us-gaap_EarningsPerShareDiluted | $ 0.88 us-gaap_EarningsPerShareDiluted | $ 0.93 us-gaap_EarningsPerShareDiluted | $ 0.82 us-gaap_EarningsPerShareDiluted | $ 0.86 us-gaap_EarningsPerShareDiluted | $ 4.04 us-gaap_EarningsPerShareDiluted | $ 3.49 us-gaap_EarningsPerShareDiluted | $ 3.36 us-gaap_EarningsPerShareDiluted

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