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Summary of Significant Accounting Policies - Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
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
Summary of Significant Accounting Policies                      
Net income, as reported $ 12,931 $ 10,724 $ 10,556 $ 7,068 $ 12,422 $ 17,333 $ 13,923 $ 11,412 $ 41,279 $ 55,090 $ 41,121
Weighted average common shares outstanding (in shares) 28,723 28,730 28,761 28,621 28,422 28,604 28,845 28,974 28,709 28,709 29,080
Weighted average common stock equivalents (in shares)                   1 2
Total weighted average common shares outstanding and common stock equivalents (in shares) 28,723 28,730 28,761 28,621 28,423 28,604 28,846 28,975 28,709 28,710 29,082
Basic earnings per common share (in dollars per share) $ 0.45 $ 0.37 $ 0.37 $ 0.25 $ 0.44 $ 0.61 $ 0.48 $ 0.39 $ 1.44 $ 1.92 $ 1.41
Diluted earnings per common share (in dollars per share) $ 0.45 $ 0.37 $ 0.37 $ 0.25 $ 0.44 $ 0.61 $ 0.48 $ 0.39 $ 1.44 $ 1.92 $ 1.41
Dividend Payout ratio                 58.30% 41.70% 51.10%