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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Mar. 31, 2016
Dec. 31, 2015
Operating Leases        
2016 $ 1,773      
2017 3,576      
2018 3,594      
2019 3,567      
2020 3,328      
Thereafter 5,895      
Total 21,733      
Minimum payments due on minimum sublease rentals under non-cancelable subleases 200      
Rent expense 1,900 $ 2,200    
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 418,200     $ 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 213,300      
Revolving home equity lines        
Loss Contingencies [Line Items]        
Loan commitments and standby letters of credit, off-balance sheet 143,700      
Undisbursed construction loans        
Loss Contingencies [Line Items]        
Loan commitments and standby letters of credit, off-balance sheet 46,800      
Standby letters of credit        
Loss Contingencies [Line Items]        
Loan commitments and standby letters of credit, off-balance sheet 3,600      
Personal and other lines of credit        
Loss Contingencies [Line Items]        
Loan commitments and standby letters of credit, off-balance sheet $ 10,800