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Commitments, Contingencies, and Guarantees (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Credit Commitments    
Credit Commitments $ 2,503,823us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability $ 2,450,719us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
Unfunded Commitments to Extend Credit    
Credit Commitments    
Credit Commitments 2,439,684us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_DebtInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember		 2,388,432us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_DebtInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
Standby Letters of Credit    
Credit Commitments    
Credit Commitments 46,812us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_DebtInstrumentAxis
= us-gaap_StandbyLettersOfCreditMember		 48,157us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_DebtInstrumentAxis
= us-gaap_StandbyLettersOfCreditMember
Commercial Letters of Credit    
Credit Commitments    
Credit Commitments $ 17,327us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_DebtInstrumentAxis
= us-gaap_LetterOfCreditMember		 $ 14,130us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_DebtInstrumentAxis
= us-gaap_LetterOfCreditMember