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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement of Stockholders' Equity [Abstract] |  |  |
Stock dividend, percent | 3.00% | 3.00% | 3.00%
Treasury Stock, Shares (in shares) | 4,608,258 | 4,558,207 |
Unallocated ESOP Shares (in shares) | 0 | 5,001 |
Cash Dividends Paid (in dollars per share) | $ 1.02 | $ 0.97 | $ 0.92
Stock Dividends (in shares) | 570,884 | 554,264 | 538,100
Stock Options Exercised (in shares) | 84,216 | 105,055 | 57,756
Shares Issued Under Directors Stock Plan (in shares) | 7,580 | 5,601 | 6,828
Shares Issued Under the Employee Stock Purchase Plan (in shares) | 15,379 | 14,832 | 15,028
Shares Issued for Dividend Reinvestment Plans (in shares) | 51,191 | 49,714 | 49,605
Purchase of Treasury Stock (in shares) | 73,495 | 58,527 | 96,496
Allocation of ESOP Stock (in shares) | 5,151 | 4,931 | 10,407

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