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Accounting for Investments in Qualified Affordable Housing Projects - Summary of Change in Accounting Principle on Statements of Income (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
Interest and dividend income | $ 41,462 us-gaap_InterestAndDividendIncomeOperating | $ 34,562 us-gaap_InterestAndDividendIncomeOperating | $ 30,343 us-gaap_InterestAndDividendIncomeOperating | $ 30,367 us-gaap_InterestAndDividendIncomeOperating | $ 30,088 us-gaap_InterestAndDividendIncomeOperating | $ 30,807 us-gaap_InterestAndDividendIncomeOperating | $ 29,598 us-gaap_InterestAndDividendIncomeOperating | $ 28,647 us-gaap_InterestAndDividendIncomeOperating | $ 136,734 us-gaap_InterestAndDividendIncomeOperating | $ 119,140 us-gaap_InterestAndDividendIncomeOperating | $ 117,282 us-gaap_InterestAndDividendIncomeOperating
Interest expense | 4,106 us-gaap_InterestExpense | 3,475 us-gaap_InterestExpense | 3,183 us-gaap_InterestExpense | 3,269 us-gaap_InterestExpense | 3,338 us-gaap_InterestExpense | 3,153 us-gaap_InterestExpense | 3,225 us-gaap_InterestExpense | 3,791 us-gaap_InterestExpense | 14,033 us-gaap_InterestExpense | 13,507 us-gaap_InterestExpense | 18,745 us-gaap_InterestExpense
Provision for credit losses | 1,026 us-gaap_ProvisionForLoanLeaseAndOtherLosses |  | (3,866)us-gaap_ProvisionForLoanLeaseAndOtherLosses | (3,300)us-gaap_ProvisionForLoanLeaseAndOtherLosses |  |  |  |  | (6,140)us-gaap_ProvisionForLoanLeaseAndOtherLosses |  | 6,000 us-gaap_ProvisionForLoanLeaseAndOtherLosses
Net interest income before provision for credit losses | 37,356 us-gaap_InterestIncomeExpenseNet | 31,087 us-gaap_InterestIncomeExpenseNet | 27,160 us-gaap_InterestIncomeExpenseNet | 27,098 us-gaap_InterestIncomeExpenseNet | 26,750 us-gaap_InterestIncomeExpenseNet | 27,654 us-gaap_InterestIncomeExpenseNet | 26,373 us-gaap_InterestIncomeExpenseNet | 24,856 us-gaap_InterestIncomeExpenseNet | 122,701 us-gaap_InterestIncomeExpenseNet | 105,633 us-gaap_InterestIncomeExpenseNet | 98,537 us-gaap_InterestIncomeExpenseNet
Noninterest income | 8,984 us-gaap_NoninterestIncome | 21,611 us-gaap_NoninterestIncome | 5,487 us-gaap_NoninterestIncome | 6,214 us-gaap_NoninterestIncome | 6,765 us-gaap_NoninterestIncome | 6,464 us-gaap_NoninterestIncome | 7,103 us-gaap_NoninterestIncome | 7,568 us-gaap_NoninterestIncome | 42,296 us-gaap_NoninterestIncome | 27,900 us-gaap_NoninterestIncome | 21,413 us-gaap_NoninterestIncome
Noninterest expense | 37,085 us-gaap_NoninterestExpense | 25,530 us-gaap_NoninterestExpense | 18,138 us-gaap_NoninterestExpense | 17,800 us-gaap_NoninterestExpense | 18,278 us-gaap_NoninterestExpense | 17,221 us-gaap_NoninterestExpense | 18,191 us-gaap_NoninterestExpense | 17,327 us-gaap_NoninterestExpense | 98,553 us-gaap_NoninterestExpense | 71,017 us-gaap_NoninterestExpense | 70,611 us-gaap_NoninterestExpense
Income from continuing operations before provision for income taxes |  |  |  |  |  |  |  |  | 72,584 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 62,516 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 43,339 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
(Benefit) provision for income taxes | 2,301 us-gaap_IncomeTaxExpenseBenefit | 5,368 us-gaap_IncomeTaxExpenseBenefit | 6,866 us-gaap_IncomeTaxExpenseBenefit | 7,844 us-gaap_IncomeTaxExpenseBenefit | 5,222 us-gaap_IncomeTaxExpenseBenefit | 6,582 us-gaap_IncomeTaxExpenseBenefit | 5,958 us-gaap_IncomeTaxExpenseBenefit | 4,970 us-gaap_IncomeTaxExpenseBenefit | 22,379 us-gaap_IncomeTaxExpenseBenefit | 22,732 us-gaap_IncomeTaxExpenseBenefit | (46,818)us-gaap_IncomeTaxExpenseBenefit
Income from continuing operations | 5,928 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 21,800 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 11,509 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 10,968 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 10,015 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 10,315 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 9,327 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 10,127 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 50,205 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 39,784 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 90,157 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Earnings per share from continuing operations |  |  |  |  |  |  |  |  |  |  |
Basic | $ 0.19 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.69 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.36 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.34 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.31 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.33 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.30 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.32 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.58 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.26 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 2.86 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Diluted | $ 0.19 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.68 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.36 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.34 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.31 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.33 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.29 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.33 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.57 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.26 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 2.86 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
As Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |
Interest and dividend income |  |  |  |  |  |  |  |  |  | 119,140 us-gaap_InterestAndDividendIncomeOperating / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 117,282 us-gaap_InterestAndDividendIncomeOperating / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Interest expense |  |  |  |  |  |  |  |  |  | 13,507 us-gaap_InterestExpense / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 18,745 us-gaap_InterestExpense / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Provision for credit losses |  |  |  |  |  |  |  |  |  |  | 6,000 us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Net interest income before provision for credit losses |  |  |  |  |  |  |  |  |  | 105,633 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 92,537 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Noninterest income |  |  |  |  |  |  |  |  |  | 27,900 us-gaap_NoninterestIncome / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 21,413 us-gaap_NoninterestIncome / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Noninterest expense |  |  |  |  |  |  |  |  |  | 71,656 us-gaap_NoninterestExpense / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 71,231 us-gaap_NoninterestExpense / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Income from continuing operations before provision for income taxes |  |  |  |  |  |  |  |  |  | 61,877 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 42,719 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
(Benefit) provision for income taxes |  |  |  |  |  |  |  |  |  | 22,044 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | (47,488)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Income from continuing operations |  |  |  |  |  |  |  |  |  | 39,833 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 90,207 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Earnings per share from continuing operations |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  | $ 1.26 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | $ 2.87 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Diluted |  |  |  |  |  |  |  |  |  | $ 1.26 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | $ 2.86 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Effect of Change in Accounting Principle [Member] |  |  |  |  |  |  |  |  |  |  |
Noninterest expense |  |  |  |  |  |  |  |  |  | (639)us-gaap_NoninterestExpense / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember | (620)us-gaap_NoninterestExpense / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Income from continuing operations before provision for income taxes |  |  |  |  |  |  |  |  |  | 639 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember | 620 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
(Benefit) provision for income taxes |  |  |  |  |  |  |  |  |  | 688 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember | 670 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Income from continuing operations |  |  |  |  |  |  |  |  |  | $ (49)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember | $ (50)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Earnings per share from continuing operations |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  | $ (0.01)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember

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