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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
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Mar. 31, 2015 | Mar. 31, 2014
Interest and dividend income | $ 41,654 us-gaap_InterestAndDividendIncomeOperating | $ 30,367 us-gaap_InterestAndDividendIncomeOperating
Interest expense | 3,981 us-gaap_InterestExpense | 3,269 us-gaap_InterestExpense
Negative provision for credit losses | (1,985)us-gaap_ProvisionForLoanLeaseAndOtherLosses | (3,300)us-gaap_ProvisionForLoanLeaseAndOtherLosses
Net interest income before provision for credit losses | 37,673 us-gaap_InterestIncomeExpenseNet | 27,098 us-gaap_InterestIncomeExpenseNet
Noninterest income | 10,634 us-gaap_NoninterestIncome | 6,214 us-gaap_NoninterestIncome
Noninterest expense | 31,704 us-gaap_NoninterestExpense | 17,799 us-gaap_NoninterestExpense
Income from continuing operations before provision for income taxes | 18,588 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 18,813 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
(Benefit) provision for income taxes | 7,534 us-gaap_IncomeTaxExpenseBenefit | 7,844 us-gaap_IncomeTaxExpenseBenefit
Income from continuing operations | 11,054 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 10,969 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Earnings per share from continuing operations |  |
Basic | $ 0.35 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.35 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Diluted | $ 0.35 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.34 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
As Previously Reported [Member] |  |
Interest and dividend income |  | 30,367 us-gaap_InterestAndDividendIncomeOperating / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Interest expense |  | 3,269 us-gaap_InterestExpense / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Negative provision for credit losses |  | (3,300)us-gaap_ProvisionForLoanLeaseAndOtherLosses / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Net interest income before provision for credit losses |  | 30,398 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Noninterest income |  | 6,214 us-gaap_NoninterestIncome / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Noninterest expense |  | 17,961 us-gaap_NoninterestExpense / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Income from continuing operations before provision for income taxes |  | 18,651 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
(Benefit) provision for income taxes |  | 7,638 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Income from continuing operations |  | 11,013 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Earnings per share from continuing operations |  |
Basic |  | $ 0.35 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Diluted |  | $ 0.35 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Effect of Change in Accounting Principle [Member] |  |
Noninterest expense |  | (162)us-gaap_NoninterestExpense / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Income from continuing operations before provision for income taxes |  | 162 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
(Benefit) provision for income taxes |  | 206 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Income from continuing operations |  | $ (44)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Earnings per share from continuing operations |  |
Diluted |  | $ (0.01)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember

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- Definition Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-5) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1, 2 , 3, 4, 5 -Article 9 + Details
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