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, 2012	$ 156,687	$ 52,035	$ 30,730	$ 31,685	$ 78,986	$ 2,953	$ 4,544	$ (44,246)
Net income	14,722				14,722
Other Comprehensive Income (Loss), Net of Tax	(12,924)						(12,924)
Dividends on preferred stock ($407, $850 and $424 per sh)	(4,417)				(4,417)
Dividends on common stock ($.40, $.42 and $.46 per sh)	(2,713)				(2,713)
Issuance of 44,521, 53,944 and 46,920 common shares pursuant to the Dividend Reinvestment Plan	1,066		187	879
Issuance of 5,920, 6,048 and 12,700 common shares pursuant to the Deferred Compensation Plan	277		51	226
Issuance of 9,693, 19,366 and 9,747 common shares pursuant to the First Retirement & Savings Plan	211		39	172
Issuance of 4,436, 5,320 and 6,322 restricted common shares pursuant to the 2007 Stock Incentive Plan	(51)		(25)	(124)		(200)
Purchase of 128,073, 165,117 and 202,170 treasury shares	(4,619)							(4,619)
Deferred Compensation	0					(77)		(77)
Tax benefit related to Deferred Compensation Plan distributions	88			88
Grant of restricted stock units pursuant to the 2007 Stock Incentive Plan	52			52
Issuance of 11,392, 44,763 and 39,373 common shares pursuant to the exercise of stock options	815		158	657
Tax benefit related to exercise of incentive stock options	22			22
Adjustments to Additional Paid in Capital, Income Tax Benefit from Non-qualified Stock Options	6	0	0	6	0	0	0	0
Vested restricted shares/units compensation expense	159	0	0	0	0	159	0	0
Balance at Dec. 31, 2013	149,381	52,035	31,190	33,911	86,578	2,989	(8,380)	(48,942)
Net income	15,461				15,461
Other Comprehensive Income (Loss), Net of Tax	7,505						7,505
Dividends on preferred stock ($407, $850 and $424 per sh)	(4,152)				(4,152)
Dividends on common stock ($.40, $.42 and $.46 per sh)	(3,540)				(3,540)
Issuance of 3,850, 1,650 and 0 shares of preferred stock	0
Issuance of 44,521, 53,944 and 46,920 common shares pursuant to the Dividend Reinvestment Plan	1,260		245	1,015
Issuance of 5,920, 6,048 and 12,700 common shares pursuant to the Deferred Compensation Plan	297		55	242
Issuance of 9,693, 19,366 and 9,747 common shares pursuant to the First Retirement & Savings Plan	188		36	152
Issuance of 4,436, 5,320 and 6,322 restricted common shares pursuant to the 2007 Stock Incentive Plan	(43)		(35)	(153)		(145)
Stock Issued During Period, Value, Conversion of Convertible Securities	0	(24,635)	(4,558)	(20,077)	0	0	0	0
Purchase of 128,073, 165,117 and 202,170 treasury shares	(1,763)							(1,763)
Treasury Stock, Retired, Cost Method, Amount	0	0	(4,000)	0	(32,391)	0	0	36,391
Deferred Compensation	0					(306)		(306)
Tax benefit related to Deferred Compensation Plan distributions	101			101
Grant of restricted stock units pursuant to the 2007 Stock Incentive Plan	(44)			(44)
Vested restricted shares/units compensation expense	179	0	0	0	0	179	0	0
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 stock ($407, $850 and $424 per sh)	(2,200)				(2,200)
Dividends on common stock ($.40, $.42 and $.46 per sh)	(4,556)				(4,556)
Issuance of 3,850, 1,650 and 0 shares of preferred stock	27,854	0	5,571	22,283	0	0	0	0
Issuance of 44,521, 53,944 and 46,920 common shares pursuant to the Dividend Reinvestment Plan	1,266		239	1,027
Issuance of 5,920, 6,048 and 12,700 common shares pursuant to the Deferred Compensation Plan	130		25	105
Issuance of 9,693, 19,366 and 9,747 common shares pursuant to the First Retirement & Savings Plan	241		48	193
Issuance of 4,436, 5,320 and 6,322 restricted common shares pursuant to the 2007 Stock Incentive Plan	(272)		(13)	(55)		(340)
Purchase of 128,073, 165,117 and 202,170 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)