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Commitments and Contingencies (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2017
USD ($)
Advances
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Guarantor Obligations [Line Items]            
Qualified Affordable Housing Project Investments $ 127,400   $ 109,810      
FDIC shared-loss receivable 3,766 $ 3,981 4,172 $ 5,281 $ 7,474 $ 4,054
FDIC shared-loss payable 99,126   97,008      
Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate $ 200,000          
Number Of Federal Home Loan Bank Advances | Advances 2          
Commitments to Extend Credit            
Guarantor Obligations [Line Items]            
Unused Commitments to Extend Credit $ 9,189,347   8,808,218      
Qualified Affordable Housing Project Investments, Commitment 67,363   57,079      
Standby Letters of Credit            
Guarantor Obligations [Line Items]            
Guarantor obligations amount $ 81,099   $ 83,750      
Recourse Obligation on Mortgage Loans Sold            
Guarantor Obligations [Line Items]            
Recourse Period, Maximum1 180 days          
Obligation to Repurchase Receivables Sold            
Guarantor Obligations [Line Items]            
Reserve for estimated losses arising from repurchase of loans $ 3,000          
Each Individual Advance            
Guarantor Obligations [Line Items]            
Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate $ 100,000