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Basis of Presentation - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 26, 2017 USD ($) $ / shares shares | Jan. 02, 2017 USD ($) | Sep. 15, 2016 USD ($) $ / shares shares | Aug. 15, 2016 USD ($) | Jun. 28, 2016 shares | Jun. 30, 2017 $ / shares shares | Jun. 30, 2016 shares | Jun. 30, 2017 USD ($) Branch $ / shares shares | Jun. 30, 2016 shares | Jul. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) $ / shares shares | Jul. 31, 2016 shares
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Description of stock split |  |  |  |  |  |  |  | the Company declared a 100-for-1 stock split, increasing the number of issued and authorized shares from 171,800 to 17,180,000 and 250,000 to 25,000,000, respectively. |  |  |  |
Stock split ratio |  |  |  |  | 0.01 |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  | 28,968,160 |  | 28,968,160 |  |  | 24,107,660 |
Common stock, shares authorized |  |  |  |  |  | 75,000,000 |  | 75,000,000 |  |  | 75,000,000 |
Proceeds from issuance of common stock, net of offering costs | $ |  |  |  |  |  |  |  | $ 152,721 |  |  |  |
Common stock sold and issued, par value | $ / shares |  |  |  |  |  | $ 1 |  | $ 1 |  |  | $ 1 |
Short-term borrowings | $ |  |  |  |  |  |  |  |  |  |  | $ 150,000 |
Dilutive instruments outstanding |  |  |  |  |  | 559,490 | 0 | 505,786 | 0 |  |  |
ASC 860-50-35, Transfers and Servicing |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to retained earnings | $ |  | $ 615 |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank Advances | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Short-term borrowings | $ |  |  |  |  |  |  |  |  |  | $ 100,000 |  |
Pro forma |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective tax rate |  |  |  |  |  |  | 37.45% |  | 37.39% |  |  |
Initial Public Offering |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock sold and issued, shares |  |  | 6,764,704 |  |  |  |  |  |  |  |  |
Common stock sold and issued, price per share | $ / shares |  |  | $ 19 |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock, net of offering costs | $ |  |  | $ 115,525 |  |  |  |  |  |  |  |  |
Distribution to majority shareholder from net proceeds | $ |  |  | 55,000 |  |  |  |  |  |  |  |  |
Repayments of aggregate principal amount of subordinated notes from net proceeds | $ |  |  | $ 10,075 | $ 10,075 |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock sold and issued, shares | 4,806,710 |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock, net of offering costs | $ | $ 152,700 |  |  |  |  |  |  |  |  |  |  |
Common stock sold and issued, par value | $ / shares | $ 1.00 |  |  |  |  |  |  |  |  |  |  |
Common stock purchase price per share | $ / shares | $ 33.00 |  |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  | 171,800 |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  | 250,000 |  |  |  |  |  |  | 25,000,000
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  | 17,180,000 |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  | 25,000,000 |  |  |  |  |  |  | 75,000,000
FirstBank |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of bank branches | Branch |  |  |  |  |  |  |  | 45 |  |  |  |

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