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Commitments and Contingencies - Commitments and Letters of Credit (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 | Dec. 31, 2014
Other Commitments [Line Items] |  |
Commitments and letters of credit | $ 1,467,727 us-gaap_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure | $ 1,232,212 us-gaap_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure
Commitments to Extend Credit [Member] |  |
Other Commitments [Line Items] |  |
Commitments and letters of credit | 1,370,341 us-gaap_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure / us-gaap_OtherCommitmentsAxis = us-gaap_CommitmentsToExtendCreditMember | 1,158,628 us-gaap_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure / us-gaap_OtherCommitmentsAxis = us-gaap_CommitmentsToExtendCreditMember
Standby Letters of Credit [Member] |  |
Other Commitments [Line Items] |  |
Commitments and letters of credit | $ 97,386 us-gaap_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure / us-gaap_OtherCommitmentsAxis = us-gaap_StandbyLettersOfCreditMember | $ 73,584 us-gaap_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure / us-gaap_OtherCommitmentsAxis = us-gaap_StandbyLettersOfCreditMember

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- Definition Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 + Details
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- Details
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- Details
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- Details
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