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Accounting for Investments in Qualified Affordable Housing Projects - Summary of Change in Accounting Principle on Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 01, 2012
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Assets |  |  |  |
Cash and cash equivalents | $ 158,320 us-gaap_CashCashEquivalentsAndFederalFundsSold | $ 179,357 us-gaap_CashCashEquivalentsAndFederalFundsSold | $ 268,047 us-gaap_CashCashEquivalentsAndFederalFundsSold | $ 201,683 us-gaap_CashCashEquivalentsAndFederalFundsSold
Available-for-Sale, Estimated Fair Value | 1,060,717 us-gaap_AvailableForSaleSecurities | 530,926 us-gaap_AvailableForSaleSecurities |  |
Loans receivable | 2,735,832 us-gaap_LoansAndLeasesReceivableNetReportedAmount | 2,177,498 us-gaap_LoansAndLeasesReceivableNetReportedAmount |  |
Deferred tax assets | 70,150 us-gaap_DeferredTaxAssetsNet | 51,888 us-gaap_DeferredTaxAssetsNet |  |
Current tax assets | 14,221 us-gaap_IncomeTaxReceivable | 11,953 us-gaap_IncomeTaxReceivable |  |
Other assets |  | 102,757 us-gaap_OtherAssetsMiscellaneous |  |
Total assets | 4,232,443 us-gaap_Assets | 3,054,379 us-gaap_Assets |  |
Liabilities and Stockholders' Equity |  |  |  |
Liabilities | 3,779,056 us-gaap_Liabilities | 2,654,302 us-gaap_Liabilities |  |
Stockholders' equity | 453,387 us-gaap_StockholdersEquity | 400,077 us-gaap_StockholdersEquity | 377,253 us-gaap_StockholdersEquity | 285,608 us-gaap_StockholdersEquity
Total liabilities and stockholders' equity | 4,232,443 us-gaap_LiabilitiesAndStockholdersEquity | 3,054,379 us-gaap_LiabilitiesAndStockholdersEquity |  |
As Previously Reported [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents |  | 179,357 us-gaap_CashCashEquivalentsAndFederalFundsSold / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 268,047 us-gaap_CashCashEquivalentsAndFederalFundsSold / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 201,683 us-gaap_CashCashEquivalentsAndFederalFundsSold / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Available-for-Sale, Estimated Fair Value |  | 530,926 us-gaap_AvailableForSaleSecurities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |
Loans receivable |  | 2,177,498 us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |
Deferred tax assets |  | 51,767 us-gaap_DeferredTaxAssetsNet / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |
Current tax assets |  | 11,769 us-gaap_IncomeTaxReceivable / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |
Other assets |  | 104,222 us-gaap_OtherAssetsMiscellaneous / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |
Total assets |  | 3,055,539 us-gaap_Assets / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |
Liabilities and Stockholders' Equity |  |  |  |
Liabilities |  | 2,654,302 us-gaap_Liabilities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |
Stockholders' equity |  | 401,237 us-gaap_StockholdersEquity / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |
Total liabilities and stockholders' equity |  | 3,055,539 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |
Effect of Change in Accounting Principle [Member] |  |  |  |
Assets |  |  |  |
Deferred tax assets |  | 121 us-gaap_DeferredTaxAssetsNet / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |
Current tax assets |  | 184 us-gaap_IncomeTaxReceivable / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |
Other assets |  | (1,465)us-gaap_OtherAssetsMiscellaneous / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |
Total assets |  | (1,160)us-gaap_Assets / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |
Liabilities and Stockholders' Equity |  |  |  |
Stockholders' equity |  | (1,160)us-gaap_StockholdersEquity / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |
Total liabilities and stockholders' equity |  | $ (1,160)us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |

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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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