Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands		Total		Common Stock		Additional Paid in Capital	Retained Earnings	Unallocated ESOP Shares	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Stockholder's Equity Beginning Balance at Dec. 31, 2013		$ 192,154		$ 16,744		$ 229,290	$ 27,457	$ (1,800)	$ (4,373)	$ (75,164)
Net Income		23,360
Other Comprehensive Income (Loss)		(2,793)							(2,793)
Stock Dividend				(335)		(8,617)	(8,952)
Cash Dividends Paid		(12,407)	[1]				12,407
Stock Options Exercised		1,454				852				602
Shares Issued Under the Directors' Stock Plan		197				123				74
Shares Issued Under the Employee Stock Purchase Plan		488				296				192
Stock-Based Compensation Expense		360				360
Tax Benefit for Exercises of Stock Options		25				25
Purchases of Treasury Stock		(2,455)								2,455
Shares Issued for Acquisition of Subsidiary		91				56				35
Allocation of ESOP Stock		452				(102)		(350)
Stockholder's Equity Ending Balance at Dec. 31, 2014		200,926		17,079		239,721	29,458	(1,450)	(7,166)	(76,716)
Net Income		24,662					24,662
Other Comprehensive Income (Loss)		(806)							(806)
Stock Dividend				(342)		(8,939)	(9,281)
Cash Dividends Paid	[1]	(12,700)					(12,700)
Stock Options Exercised		918				489				429
Shares Issued Under the Directors' Stock Plan		227				143				84
Shares Issued Under the Employee Stock Purchase Plan		494				306				188
Shares Issued for Dividend Reinvestment Plans		886				570				316
Stock-Based Compensation Expense		308				308
Tax Benefit for Exercises of Stock Options		59				59
Purchases of Treasury Stock		(1,498)								(1,498)
Shares Issued for Acquisition of Subsidiary		0
Allocation of ESOP Stock		495				(145)		(350)
Stockholder's Equity Ending Balance at Dec. 31, 2015		213,971		17,421		250,680	32,139	(1,100)	(7,972)	(77,197)
Net Income		26,534					26,534
Other Comprehensive Income (Loss)		1,138							1,138
Stock Dividend				(522)	[2]	(16,415)	(16,937)
Cash Dividends Paid	[1]	(13,092)					(13,092)
Stock Options Exercised		2,404				1,265				1,139
Shares Issued Under the Directors' Stock Plan		205				138				67
Shares Issued Under the Employee Stock Purchase Plan		493				318				175
Shares Issued for Dividend Reinvestment Plans		1,743				1,167				576
Stock-Based Compensation Expense		287				287
Tax Benefit for Exercises of Stock Options		188				188
Purchases of Treasury Stock		(2,141)								(2,141)
Shares Issued for Acquisition of Subsidiary		0
Allocation of ESOP Stock		1,122				(422)		(700)
Stockholder's Equity Ending Balance at Dec. 31, 2016		$ 232,852		$ 17,943		$ 270,880	$ 28,644	$ (400)	$ (6,834)	$ (77,381)

[1] Cash dividends paid per share have been adjusted for the September 29, 2016 3% stock dividend.

[2] Included in the shares issued for the 3% stock dividend in 2016 were treasury shares of 130,499 and unallocated ESOP shares of 1,118.