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Accounting for Investments in Qualified Affordable Housing Projects - Summary of Change in Accounting Principle on Statements of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Cash flows from operating activities: |  |
Net income | $ 11,054 us-gaap_NetIncomeLoss | $ 10,991 us-gaap_NetIncomeLoss
Total adjustment in net income |  | 12,274 us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
Net cash provided by operating activities | (5,007)us-gaap_NetCashProvidedByUsedInOperatingActivities | 23,265 us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities: |  |
Net cash provided by investing activities | 185,550 us-gaap_NetCashProvidedByUsedInInvestingActivities | 2,418 us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities: |  |
Net cash used in financing activities | (156,809)us-gaap_NetCashProvidedByUsedInFinancingActivities | (656)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net increase in cash and cash equivalents | 23,734 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 25,027 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year | 158,320 us-gaap_CashCashEquivalentsAndFederalFundsSold | 179,357 us-gaap_CashCashEquivalentsAndFederalFundsSold
Cash and cash equivalents at end of period | 182,054 us-gaap_CashCashEquivalentsAndFederalFundsSold | 204,384 us-gaap_CashCashEquivalentsAndFederalFundsSold
As Previously Reported [Member] |  |
Cash flows from operating activities: |  |
Net income |  | 11,035 us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Total adjustment in net income |  | 12,230 us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Net cash provided by operating activities |  | 23,265 us-gaap_NetCashProvidedByUsedInOperatingActivities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Cash flows from investing activities: |  |
Net cash provided by investing activities |  | 2,418 us-gaap_NetCashProvidedByUsedInInvestingActivities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Cash flows from financing activities: |  |
Net cash used in financing activities |  | (656)us-gaap_NetCashProvidedByUsedInFinancingActivities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Net increase in cash and cash equivalents |  | 25,027 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Cash and cash equivalents at beginning of year |  | 179,357 us-gaap_CashCashEquivalentsAndFederalFundsSold / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Cash and cash equivalents at end of period |  | 204,384 us-gaap_CashCashEquivalentsAndFederalFundsSold / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Effect of Change in Accounting Principle [Member] |  |
Cash flows from operating activities: |  |
Net income |  | (44)us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Total adjustment in net income |  | $ 44 us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember

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- Definition The sum of adjustments which are added to or deducted from net income or loss, including the portion attributable to noncontrolling interest, to reflect cash provided by or used in operating activities, in accordance with the indirect cash flow method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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