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Earnings Per Share - Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 11, 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 | Sep. 10, 2018
Numerator for Earnings per Common Share-Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  |  |  |  | $ 98,234 | $ 105,334 | $ 72,968 |
Less: Income allocated to participating shares |  |  |  |  |  |  |  |  |  |  |  | 260 | 304 | 242 |
Net Income Allocated to Common Shareholders |  |  | $ 22,269 | [1] | $ 26,936 | $ 26,101 | $ 22,928 | $ 26,854 | $ 30,881 | $ 21,436 | $ 26,163 | 97,974 | 105,030 | 72,726 |
Numerator for Earnings per Common Share—Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  |  |  |  | $ 98,234 | $ 105,334 | $ 72,968 |
Denominators: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Common Shares Outstanding-Basic (in shares) |  |  |  |  |  |  |  |  |  |  |  | 34,628,191 | 34,775,784 | 34,729,376 |
Add: Dilutive potential common shares (in shares) |  |  |  |  |  |  |  |  |  |  |  | 94,763 | 199,625 | 225,391 |
Denominator for Treasury Stock Method-Diluted (in shares) |  |  |  |  |  |  |  |  |  |  |  | 34,722,954 | 34,975,409 | 34,954,767 |
Weighted Average Common Shares Outstanding-Basic (in shares) |  |  |  |  |  |  |  |  |  |  |  | 34,628,191 | 34,775,784 | 34,729,376 |
Add: Average participating shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  | 51,287 | 100,733 | 115,418 |
Denominator for Two-Class Method-Diluted (in shares) |  |  |  |  |  |  |  |  |  |  |  | 34,679,478 | 34,876,517 | 34,844,794 |
Earnings per common share—basic (in USD per share) |  |  |  |  |  |  |  |  |  |  |  | $ 2.84 | $ 3.03 | $ 2.10 |
Earnings per common share—diluted (in USD per share) |  |  | $ 0.62 | [1] | $ 0.79 | $ 0.76 | $ 0.66 | $ 0.77 | $ 0.88 | $ 0.61 | $ 0.75 | $ 2.82 | $ 3.01 | $ 2.09 |
Repurchase of warrant |  | $ 7,700 |  |  |  |  |  |  |  |  |  | $ 0 | $ 7,652 | $ 0 |
Number of shares of common stock that holder of warrants have right to purchase (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 517,012
Warrants exercise price (in USD per share) |  |  | $ 31.53 |  |  |  |  | $ 31.53 |  |  |  | $ 31.53 | $ 31.53 | $ 31.53 | $ 31.53
Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Denominators: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Anti-dilutive securities excluded from dilutive potential common shares | [2] |  |  |  |  |  |  |  |  |  |  | 0 | 267,106 | 438,681 |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Denominators: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Anti-dilutive securities excluded from dilutive potential common shares |  |  |  |  |  |  |  |  |  |  |  | 12,686 | 81,587 | 88,578 |
[1] | The DNB Merger is included in our consolidated financial statements beginning on December 1, 2019.
[2] | We repurchased our outstanding warrant on September 11, 2018 for $7.7 million. Prior to the repurchase, the warrant provided the holder the right to 517,012 shares of common stock at a strike price of $31.53 per share via cashless exercise.

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