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Commitments and Contingencies (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2012 | Jun. 30, 2017 | Dec. 31, 2016
Operating Leases |  |  |  |  |
2017 | $ 984 |  |  |  |
2018 | 3,932 |  |  |  |
2019 | 3,739 |  |  |  |
2020 | 3,420 |  |  |  |
2021 | 2,138 |  |  |  |
Thereafter | 4,234 |  |  |  |
Total | 18,447 |  |  |  |
Minimum payments due on minimum sublease rentals under non-cancelable subleases | 76 |  |  |  |
Rent expense | $ 3,000 | $ 2,800 |  |  |
Visa Inc. |  |  |  |  |
Litigation Matters |  |  |  |  |
Balance of escrow account for legal settlements |  |  |  | $ 978,000 |
Visa Inc. | Pending due to reversal |  |  |  |  |
Litigation Matters |  |  |  |  |
Class settlement agreement amount, reversed by appellate court |  |  | $ 4,000,000 |  |
Settlements reached by percentage of sales volume of merchants who opted out in Visa litigation, percent | 34.00% |  |  |  |
Loan commitments and standby letters of credit, unused |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loan commitments and standby letters of credit, off-balance sheet | $ 406,869 |  |  |  | $ 422,289
Loan commitments and standby letters of credit, unused | Interest payable and other liabilities |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Allowance for off balance sheet commitments | 957 |  |  |  | 899
Commercial lines of credit |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loan commitments and standby letters of credit, off-balance sheet | 198,160 |  |  |  | 216,774
Revolving home equity lines |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loan commitments and standby letters of credit, off-balance sheet | 160,935 |  |  |  | 148,143
Undisbursed construction loans |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loan commitments and standby letters of credit, off-balance sheet | 34,266 |  |  |  | 44,798
Personal and other lines of credit |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loan commitments and standby letters of credit, off-balance sheet | 11,735 |  |  |  | 10,635
Standby letters of credit |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loan commitments and standby letters of credit, off-balance sheet | $ 1,773 |  |  |  | $ 1,939

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