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Commitments and Contingencies (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Advances
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Guarantor Obligations [Line Items]            
Qualified Affordable Housing Project Investments $ 151,500   $ 128,000      
FDIC shared-loss payable $ 104,576 $ 103,487 101,342 $ 100,203 $ 99,126 $ 97,008
Number Of Federal Home Loan Bank Advances | Advances          
Commitments to Extend Credit            
Guarantor Obligations [Line Items]            
Unused Commitments to Extend Credit $ 9,801,361   9,629,365      
Qualified Affordable Housing Project Investments, Commitment 74,777   61,819      
Standby Letters of Credit            
Guarantor Obligations [Line Items]            
Guarantor obligations amount $ 87,858   81,530      
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 $ 885   $ 882