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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2012
Dec. 31, 2017
Operating Leases        
2018 $ 3,330      
2019 4,198      
2020 3,758      
2021 2,138      
2022 1,330      
Thereafter 2,904      
Total 17,658      
Minimum payments due on minimum sublease rentals under non-cancelable subleases 25      
Rent expense 1,000 $ 1,000    
Visa Inc.        
Litigation Matters        
Settlement agreement amount     $ 4,000,000  
Balance of escrow account for legal settlements 900,000      
Visa Inc. | Pending due to reversal        
Litigation Matters        
Settlements reached by percentage of sales volume of merchants who opted out in Visa litigation, percent       51.00%
Loan commitments and standby letters of credit, unused        
Loss Contingencies [Line Items]        
Loan commitments and standby letters of credit, off-balance sheet 453,844     $ 453,202
Loan commitments and standby letters of credit, unused | Interest payable and other liabilities        
Loss Contingencies [Line Items]        
Allowance for off balance sheet commitments 958     958
Commercial lines of credit        
Loss Contingencies [Line Items]        
Loan commitments and standby letters of credit, off-balance sheet 226,816     224,370
Revolving home equity lines        
Loss Contingencies [Line Items]        
Loan commitments and standby letters of credit, off-balance sheet 187,405     177,678
Undisbursed construction loans        
Loss Contingencies [Line Items]        
Loan commitments and standby letters of credit, off-balance sheet 24,315     35,322
Personal and other lines of credit        
Loss Contingencies [Line Items]        
Loan commitments and standby letters of credit, off-balance sheet 12,769     11,758
Standby letters of credit        
Loss Contingencies [Line Items]        
Loan commitments and standby letters of credit, off-balance sheet $ 2,539     $ 4,074