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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
 6 Months Ended 9 Months Ended
Jun. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Operating Leases        
2016   $ 903    
2017   3,832    
2018   3,898    
2019   3,707    
2020   3,385    
Thereafter   6,321    
Total   22,046    
Minimum payments due on minimum sublease rentals under non-cancelable subleases   175    
Rent expense   2,800 $ 3,200  
Visa Inc.        
Litigation Matters        
Balance of escrow account for legal settlements $ 1,000,000      
Visa Inc. | Pending due to reversal        
Litigation Matters        
Class settlement agreement amount, reversed by appellate court $ 4,000,000      
Loan commitments and standby letters of credit, unused        
Loss Contingencies [Line Items]        
Loan commitments and standby letters of credit, off-balance sheet   416,500   $ 376,600
Loan commitments and standby letters of credit, unused | Interest payable and other liabilities        
Loss Contingencies [Line Items]        
Allowance for off balance sheet commitments   899   $ 749
Commercial lines of credit        
Loss Contingencies [Line Items]        
Loan commitments and standby letters of credit, off-balance sheet   212,600    
Revolving home equity lines        
Loss Contingencies [Line Items]        
Loan commitments and standby letters of credit, off-balance sheet   149,000    
Undisbursed construction loans        
Loss Contingencies [Line Items]        
Loan commitments and standby letters of credit, off-balance sheet   40,700    
Standby letters of credit        
Loss Contingencies [Line Items]        
Loan commitments and standby letters of credit, off-balance sheet   3,500    
Personal and other lines of credit        
Loss Contingencies [Line Items]        
Loan commitments and standby letters of credit, off-balance sheet   $ 10,700