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Earnings Per Share - Reconciliation (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 15 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 16, 2019 | Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2016 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2009 | Mar. 31, 2019 | Jan. 16, 2009
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding |  | 29,899,063 |  | 29,747,078 |  |  | 29,880,511 | 29,718,191 |  |  |
Net income |  | $ 12,173,000 |  | $ 9,642,000 |  |  | $ 29,919,000 | $ 25,392,000 |  |  |
Basic earnings per share (in dollars per share) |  | $ 0.41 |  | $ 0.32 |  |  | $ 1.00 | $ 0.85 |  |  |
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding |  | 29,899,063 |  | 29,747,078 |  |  | 29,880,511 | 29,718,191 |  |  |
Diluted average common shares outstanding |  | 30,438,333 |  | 30,383,891 |  |  | 30,390,965 | 30,297,294 |  |  |
Net earnings available to common stockholders |  | $ 12,173,000 |  | $ 9,642,000 |  |  | $ 29,919,000 | $ 25,392,000 |  |  |
Diluted earnings per share (in dollars per share) |  | $ 0.40 |  | $ 0.32 |  |  | $ 0.98 | $ 0.84 |  |  |
Warrants, exercise price (in dollars per share) | $ 14.23 |  |  | $ 13.43 |  |  |  | $ 13.43 |  |  |
Warrant term |  |  |  |  |  | 10 years |  |  |  |  |
Stock warrants exercised | $ (313,000) |  |  |  |  |  |  |  |  |  |
Stock warrants exercised (in shares) | 45,836 |  |  |  |  |  |  |  |  |  |
Warrant [Member] |  |  |  |  |  |  |  |  |  |  |
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities |  |  |  |  |  |  |  | 815,339 |  |  |
Warrants, exercise price (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 13.43
Warrant term |  |  | 10 years |  | 10 years |  |  |  | 10 years | 10 years |
Restricted Stock and Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |  |
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |
Dilutive effect of share-based payment awards (in shares) |  | 539,270 |  | 563,781 |  |  | 510,454 | 525,627 |  |  |
Employee and Nonemployee Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |
Dilutive effect of share-based payment awards (in shares) |  |  |  | 73,032 |  |  |  | 53,476 |  |  |

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