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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) | Dec. 31, 2018 USD ($) branch Segment shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2019 USD ($) | Aug. 31, 2018 shares
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Number of reportable segments | Segment |  | 1 |  |  |  |
Proceeds from redemption of FRB stock | $ 14,400 | $ 0 | $ 0 | $ 14,423 |  |
Estimated loss emergence period |  | 2 years 6 months | 2 years 6 months | 2 years 6 months |  |
Full Service |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Number of branches | branch |  | 39 |  |  |  |
Loan Production |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Number of branches | branch |  | 9 |  |  |  |
Equipment Financing Receivable | Minimum |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Intangible asset amortization period |  | 1 year |  |  |  |
Equipment Financing Receivable | Maximum |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Intangible asset amortization period |  | 7 years |  |  |  |
Stock Repurchase Program |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Number of shares authorized for repurchase (percent) |  |  |  |  |  | 5.00%
Number of shares authorized for repurchase under program (shares) | shares |  |  |  |  |  | 1,600,000
Shares repurchased (shares) | shares |  | 1,600,000.0 |  |  |  |
Shares repurchased |  | $ 36,100 |  |  |  |
ASU 2016-02 | Expected |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Right-of-use asset (less than) |  |  |  |  | $ 50,000 |

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