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Selected Quarterly Financial Data (unaudited) - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ 15,852 | $ 15,342 | $ 13,211 | $ 12,597 | $ 17,121 | $ 14,536 | $ 2,768 | $ 6,768 | $ 57,002 | $ 41,193 | $ 21,695
Basic earnings per common share |  | $ 0.41 | $ 0.40 | $ 0.35 | $ 0.34 | $ 0.47 | $ 0.40 | $ 0.08 | $ 0.22 | $ 1.51 | $ 1.21 | $ 0.39
Net interest income before provision for loan losses |  | $ 53,914 | $ 57,838 | $ 54,448 | $ 50,085 | $ 53,261 | $ 52,593 | $ 39,056 | $ 33,695 | $ 216,285 | $ 178,605 | $ 122,912
Data processing costs |  |  |  |  |  |  |  |  |  | $ 13,733 | $ 18,242 | $ 9,539
Contract termination |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Data processing costs | $ 8,100 |  |  |  |  |  |  | $ 8,100 |  |  |  |

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