Annual report pursuant to Section 13 and 15(d)

Accounting for Investments in Qualified Affordable Housing Projects - Summary of Change in Accounting Principle on Statements of Cash Flows (Detail)

v2.4.1.9
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
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:      
Net income $ 49,761us-gaap_NetIncomeLoss $ 39,857us-gaap_NetIncomeLoss $ 90,324us-gaap_NetIncomeLoss
Total adjustment in net income   20,861us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities (37,497)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
Net cash provided by operating activities 25,467us-gaap_NetCashProvidedByUsedInOperatingActivities 60,718us-gaap_NetCashProvidedByUsedInOperatingActivities 52,827us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:      
Net cash used in investing activities 16,397us-gaap_NetCashProvidedByUsedInInvestingActivities (304,366)us-gaap_NetCashProvidedByUsedInInvestingActivities (37,158)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:      
Net cash provided by financing activities (62,901)us-gaap_NetCashProvidedByUsedInFinancingActivities 154,958us-gaap_NetCashProvidedByUsedInFinancingActivities 50,695us-gaap_NetCashProvidedByUsedInFinancingActivities
Net increase (decrease) in cash and cash equivalents (21,037)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (88,690)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 66,364us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year 179,357us-gaap_CashCashEquivalentsAndFederalFundsSold 268,047us-gaap_CashCashEquivalentsAndFederalFundsSold 201,683us-gaap_CashCashEquivalentsAndFederalFundsSold
Cash and cash equivalents at end of period 158,320us-gaap_CashCashEquivalentsAndFederalFundsSold 179,357us-gaap_CashCashEquivalentsAndFederalFundsSold 268,047us-gaap_CashCashEquivalentsAndFederalFundsSold
As Previously Reported [Member]      
Cash flows from operating activities:      
Net income   39,906us-gaap_NetIncomeLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
90,374us-gaap_NetIncomeLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Total adjustment in net income   20,812us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
(37,547)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Net cash provided by operating activities   60,718us-gaap_NetCashProvidedByUsedInOperatingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
52,827us-gaap_NetCashProvidedByUsedInOperatingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Cash flows from investing activities:      
Net cash used in investing activities   (304,366)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
(37,158)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Cash flows from financing activities:      
Net cash provided by financing activities   154,958us-gaap_NetCashProvidedByUsedInFinancingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
50,695us-gaap_NetCashProvidedByUsedInFinancingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Net increase (decrease) in cash and cash equivalents   (88,690)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
66,364us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Cash and cash equivalents at beginning of year   268,047us-gaap_CashCashEquivalentsAndFederalFundsSold
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
201,683us-gaap_CashCashEquivalentsAndFederalFundsSold
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Cash and cash equivalents at end of period   179,357us-gaap_CashCashEquivalentsAndFederalFundsSold
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
268,047us-gaap_CashCashEquivalentsAndFederalFundsSold
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Effect of Change in Accounting Principle [Member]      
Cash flows from operating activities:      
Net income   (49)us-gaap_NetIncomeLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
(50)us-gaap_NetIncomeLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
Total adjustment in net income   $ 49us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
$ 50us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember