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Earnings Per Share and Capital Stock (Details) - USD ($) | 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
Basic |  |  |  |  |  |  |  |  |  |  |  |
Net Income |  | $ 16,700,000 | $ 28,006,000 | $ 26,784,000 | $ 12,852,000 | $ 13,789,000 | $ 22,952,000 | $ 16,348,000 | $ 10,782,000 | $ 84,342,000 | $ 63,871,000 | $ 69,367,000
Less: Distributed earnings to common shareholders |  |  |  |  |  |  |  |  |  | 42,702,000 | 38,937,000 | 36,417,000
Less: Distributed earnings to participating securities |  |  |  |  |  |  |  |  |  | 180,000 | 204,000 | 197,000
Undistributed earnings |  |  |  |  |  |  |  |  |  | 41,460,000 | 24,730,000 | 32,753,000
Undistributed earnings allocated to common shareholders |  |  |  |  |  |  |  |  |  | 41,285,000 | 24,601,000 | 32,577,000
Undistributed earnings allocated to participating securities |  |  |  |  |  |  |  |  |  |  | 129,000 | 176,000
Total income available to common shareholders, basic |  |  |  |  |  |  |  |  |  | $ 83,987,000 | $ 63,538,000 | $ 68,994,000
Weighted average Common Shares outstanding, basic |  |  |  |  |  |  |  |  |  | 36,814,000 | 36,733,000 | 36,638,000
Basic earnings per Common Share: |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic |  | $ 0.45 | $ 0.76 | $ 0.72 | $ 0.35 | $ 0.37 | $ 0.62 | $ 0.44 | $ 0.29 | $ 2.28 | $ 1.73 | $ 1.88
Diluted |  |  |  |  |  |  |  |  |  |  |  |
Total income available to common shareholders, basic |  |  |  |  |  |  |  |  |  | $ 83,987,000 | $ 63,538,000 | $ 68,994,000
Undistributed earnings for dilutive stock options |  |  |  |  |  |  |  |  |  | 175,000 | 129,000 | 176,000
Total common shareholders earnings, diluted |  |  |  |  |  |  |  |  |  | $ 84,162,000 | $ 63,667,000 | $ 69,170,000
Weighted average Common Shares outstanding, basic |  |  |  |  |  |  |  |  |  | 36,814,000 | 36,733,000 | 36,638,000
Stock-based compensation (in shares) | [1] |  |  |  |  |  |  |  |  | 150,000 | 203,000 | 206,000
Weighted average common shares outstanding, diluted |  |  |  |  |  |  |  |  |  | 36,964,000 | 36,936,000 | 36,844,000
Diluted earnings per Common Share: |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Diluted |  | $ 0.45 | $ 0.76 | $ 0.72 | $ 0.35 | $ 0.37 | $ 0.62 | $ 0.44 | $ 0.29 | $ 2.28 | $ 1.72 | $ 1.88
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) |  | 159,720 |  |  |  |  |  |  |  | 159,720 |  |
[1] | (1) In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 159,720 restricted stock units, including performance awards, at December 31, 2019 were deemed to be outstanding in accordance with accounting guidance on earnings per share.

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