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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

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