Consolidated Statements of Changes in Stockholders' Equity Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Deferred Compensation	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balance at Dec. 31, 2014	$ 164,916	$ 27,400	$ 32,119	$ 55,607	$ 61,956	$ 3,329	$ (875)	$ (14,620)
Net income	16,512				16,512
Other Comprehensive Income (Loss), Net of Tax	1,598						1,598
Dividends on preferred shares	(2,200)				(2,200)
Dividends on common stock	(4,556)				(4,556)
Issuance of common shares pursuant to the Dividend Reinvestment Plan	1,266		239	1,027
Issuance of common shares pursuant to the Deferred Compensation Plan	130		25	105
Issuance of common shares pursuant to the First Retirement & Savings Plan	241		48	193
Issuance of restricted common shares pursuant to the 2007 Stock Incentive Plan	(272)		13	55		(340)
Stock Issued During Period, Value, New Issues	27,854	0	5,571	22,283	0	0	0	0
Purchase of treasury shares	(1,066)							(1,066)
Deferred Compensation	0					26		26
Tax benefit related to Deferred Compensation Plan distributions	85			85
Grant of restricted stock units pursuant to the 2007 Stock Incentive Plan	271			271
Vested restricted shares/units compensation expense	230	0	0	0	0	230	0	0
Balance at Dec. 31, 2015	205,009	27,400	38,015	79,626	71,712	3,245	723	(15,712)
Net income	21,840				21,840
Other Comprehensive Income (Loss), Net of Tax	(6,484)						(6,484)
Dividends on preferred shares	(825)				(825)
Dividends on common stock	(6,511)				(6,511)
Issuance of common shares pursuant to the Dividend Reinvestment Plan	1,323		202	1,121
Issuance of common shares pursuant to the Deferred Compensation Plan	119		19	100
Issuance of common shares pursuant to the First Retirement & Savings Plan	14		2	12
Issuance of restricted common shares pursuant to the 2007 Stock Incentive Plan	80		12	68
Issuance of common shares pursuant to the exercise of stock options	62		10	52
Stock issued during period, Conversion of Preferred Shares	0	(27,400)	(5,421)	(21,979)
Stock Issued During Period, Value, Acquisitions	65,697	0	10,402	55,295	0	0	0	0
Deferred Compensation	0					25		25
Tax benefit related to Deferred Compensation Plan distributions	140			140
Grant of restricted stock units pursuant to the 2007 Stock Incentive Plan	278			278
Vested restricted shares/units compensation expense	(69)	0	0	0	0	(69)	0	0
Balance at Dec. 31, 2016	280,673		54,083	158,671	86,216	3,201	(5,761)	(15,737)
Net income	26,684				26,684
Other Comprehensive Income (Loss), Net of Tax	3,525						3,525
Dividends on preferred shares	0
Reclassification from AOCI, Current Period, Tax	0	0	0	0	68	0	(68)	0
Dividends on common stock	(8,285)				(8,285)
Issuance of common shares pursuant to the Dividend Reinvestment Plan	1,057		120	937
Issuance of common shares pursuant to the Deferred Compensation Plan	232		28	204
Issuance of restricted common shares pursuant to the 2007 Stock Incentive Plan	1,804		189	1,615
Stock Issued During Period, Value, New Issues	3,251	0	395	2,856	0	0	0	0
Issuance of common shares pursuant to the exercise of stock options	699		110	589
Purchase of treasury shares	(797)							(797)
Deferred Compensation	0					51		51
Tax benefit related to Deferred Compensation Plan distributions	216			216
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	5			5
Grant of restricted stock units pursuant to the 2007 Stock Incentive Plan	359			359
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	(1,849)			(1,849)
Vested restricted shares/units compensation expense	390	0	0	0	0	390	0	0
Balance at Dec. 31, 2017	$ 307,964	$ 0	$ 54,925	$ 163,603	$ 104,683	$ 3,540	$ (2,304)	$ (16,483)