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Earnings per Share (Computation of Basic and Diluted Earnings Per Share) (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
$ / shares
Jun. 30, 2018
USD ($)
$ / shares
Mar. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
 [1]
Sep. 30, 2017
USD ($)
$ / shares
Jun. 30, 2017
USD ($)
$ / shares
Mar. 31, 2017
USD ($)
$ / shares
Sep. 30, 2016
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]                        
Net income | $ $ 13,977 $ 14,057 $ 12,217 $ 12,820 $ (3,173) $ 11,339 $ 10,234 $ 10,076   $ 53,071 $ 28,476 $ 40,067
Dividends and undistributed earnings allocated to participating securities(1) | $ [2]                   (148) (118) (189)
Net income available to common shareholders | $                   $ 52,923 $ 28,358 $ 39,878
Weighted-average common shares outstanding for basic EPS                   15,571,387 15,509,665 15,422,160
Dilutive effect of stock-based awards [3]                   54,916 78,682 82,079
Weighted-average common and potential common shares for diluted EPS                   15,626,303 15,588,347 15,504,239
Basic EPS | $ / shares $ 0.90 $ 0.90 $ 0.78 $ 0.82 $ (0.20) $ 0.72 $ 0.66 $ 0.65   $ 3.40 $ 1.83 $ 2.59
Diluted EPS | $ / shares $ 0.89 $ 0.90 $ 0.78 $ 0.82 $ (0.20) $ 0.72 $ 0.66 $ 0.64   $ 3.39 $ 1.82 $ 2.57
Shares that were not considered in computation of potential common shares for purposes of diluted EPS                   0 0 0
Stockholders' Equity Note, Stock Split, Conversion Ratio                 1.5 1.5    
[1] (1) In the fourth quarter of 2017, the Company recognized $14.3 million of additional income tax expense upon the revaluation of its deferred tax assets and liabilities upon enactment of the Tax Act on December 22, 2017, which lowered the federal corporate tax rate from 35.0% to 21.0%, effective January 1, 2018. The impact to fourth quarter 2017 basic and diluted EPS was $0.91 per share.
[2] Represents dividends paid and undistributed earnings allocated to nonvested stock-based awards that contain non-forfeitable rights to dividends.
[3] Represents the effect of the assumed exercise of stock options, vesting of restricted shares and restricted stock units, and issuance of LTIP awards that have met the performance criteria, utilizing the treasury stock method.