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Earnings Per Share and Capital Stock (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Basic                      
Net Income $ 13,789,000 $ 22,952,000 $ 16,348,000 $ 10,782,000 $ 12,868,000 $ 21,006,000 $ 22,792,000 $ 12,701,000 $ 63,871,000 $ 69,367,000 $ 59,743,000
Less: Distributed earnings to common shareholders                 38,937,000 36,417,000 33,408,000
Less: Distributed earnings to participating securities                 204,000 197,000 187,000
Undistributed earnings                 24,730,000 32,753,000 26,148,000
Undistributed earnings allocated to common shareholders                 24,601,000 32,577,000 26,003,000
Undistributed earnings allocated to participating securities                   176,000 145,000
Total income available to common shareholders, basic                 $ 63,538,000 $ 68,994,000 $ 59,411,000
Weighted average Common Shares outstanding, basic                 36,733,000 36,638,000 36,552,000
Basic earnings per Common Share:                      
Earnings Per Share, Basic $ 0.37 $ 0.62 $ 0.44 $ 0.29 $ 0.35 $ 0.57 $ 0.62 $ 0.35 $ 1.73 $ 1.88 $ 1.63
Diluted                      
Total income available to common shareholders, basic                 $ 63,538,000 $ 68,994,000 $ 59,411,000
Undistributed earnings for dilutive stock options                 129,000 176,000 145,000
Total common shareholders earnings, diluted                 $ 63,667,000 $ 69,170,000 $ 59,556,000
Weighted average Common Shares outstanding, basic                 36,733,000 36,638,000 36,552,000
Stock-based compensation (in shares) [1]                 203,000 206,000 198,000
Weighted average common shares outstanding, diluted                 36,936,000 36,844,000 36,750,000
Diluted earnings per Common Share:                      
Earnings Per Share, Diluted $ 0.37 $ 0.62 $ 0.44 $ 0.29 $ 0.35 $ 0.57 $ 0.62 $ 0.34 $ 1.72 $ 1.88 $ 1.62
Stock option and restricted stock option outstanding                      
Options outstanding (in shares) 35,560               35,560    
Share based compensation arrangement                      
Proceeds from Stock Options Exercised, Distributed to Subsidiaries                 $ 0 $ 0 $ 0
Dividend Reinvestment Plan Common Stock Capital Shares Reserved for Future Issuance 1,055,948               1,055,948    
Common Shares authorized for issuance but unissued under 401(k) Plan 387,300               387,300    
Restricted Stock Units                      
Share based compensation arrangement                      
Restricted stock units outstanding (in shares) 197,896               197,896    
[1] (1) In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 35,560 stock options and 197,896 restricted stock units, including performance awards, at December 31, 2018 were deemed to be outstanding in accordance with accounting guidance on earnings per share.