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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement of Stockholders' Equity [Abstract] |  |  |  |  |
Stock dividend, percent |  | 300.00% | [1] | 300.00% | 300.00%
Stock dividends (in shares) |  | 588,025 | [1] | 570,884 | 554,264
Cash Dividends Paid (in dollars per share) | [2] | $ 1.02 |  | $ 0.99 | $ 0.94
Shares Issued for Stock Option Exercises (in shares |  | 33,895 |  |  |
Shares Issued for Stock Option Exercises, net (in shares) |  | 33,112 |  | 84,216 | 105,055
Shares Issued Under Directors Stock Plan (in shares) |  | 4,245 |  | 7,580 | 5,601
Shares Issued Under the Employee Stock Purchase Plan (in shares) |  | 18,286 |  | 15,379 | 14,832
Shares Issued for Dividend Reinvestment Plans (in shares) |  | 63,425 |  | 51,191 | 49,714
Purchase of Treasury Stock (in shares) |  | 52,505 |  | 73,495 | 58,527
Allocation of ESOP Stock (in shares) |  |  |  | 5,151 | 4,931
Treasury Stock, Shares (in shares) |  | 4,678,736 |  | 4,608,258 |
[1] | Included in the shares issued for the 3% stock dividend in 2020 were treasury shares of 137,041
[2] | Cash dividends paid per share have been adjusted for the September 25, 2020 3% stock dividend.

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