Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Deferred Compensation [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2008	$ 0	$ 29,017	$ 25,289	$ 58,059	$ 2,787	$ (416)	$ (31,958)	$ 82,778
Comprehensive income:
Net income	0	0	0	8,214	0	0	0	8,214
Net unrealized change in available-for-sale investment securities	0	0	0	0	0	880	0	880
Total Comprehensive Income								9,094
Dividends on preferred stock ($370, $455, $407 per share)	0	0	0	(1,821)	0	0	0	(1,821)
Dividends on common stock ($.38, $.38, $.40 per share)	0	0	0	(2,308)	0	0	0	(2,308)
Issuance of 4,927, 0, 3,850 shares of preferred stock	24,635	0	0	0	0	0	0	24,635
Issuance of 44,661, 38,494, 44,521 common shares pursuant to the Dividend Reinvestment Plan	0	179	674	0	0	0	0	853
Issuance of 9,916, 4,766, 5,920 common shares pursuant to the Deferred Compensation Plan	0	40	136	0	0	0	0	176
Issuance of 19,000, 19,414, 9,693 common shares pursuant to the First Retirement & Savings Plan	0	75	255	0	0	0	0	330
Purchase of 160,803, 136,380, 128,073 treasury shares	0	0	0	0	0	0	(3,122)	(3,122)
Deferred compensation	0	0	0	0	107	0	(107)	0
Tax benefit related to deferred compensation distributions	0	0	67	0	0	0	0	67
Issuance of 37,266, 49,500, 11,392 common shares pursuant to the exercise of stock options	0	149	239	0	0	0	0	388
Tax benefit related to exercise of incentive stock options	0	0	19	0	0	0	0	19
Tax benefit related to exercise of non-qualified stock options	0	0	79	0	0	0	0	79
Vested stock options compensation expense	0	0	53	0	0	0	0	53
Balance at Dec. 31, 2009	24,635	29,460	26,811	62,144	2,894	464	(35,187)	111,221
Comprehensive income:
Net income	0	0	0	8,761	0	0	0	8,761
Net unrealized change in available-for-sale investment securities	0	0	0	0	0	(2,530)	0	(2,530)
Total Comprehensive Income								6,231
Dividends on preferred stock ($370, $455, $407 per share)	0	0	0	(2,240)	0	0	0	(2,240)
Dividends on common stock ($.38, $.38, $.40 per share)	0	0	0	(2,309)	0	0	0	(2,309)
Issuance of 44,661, 38,494, 44,521 common shares pursuant to the Dividend Reinvestment Plan	0	154	526	0	0	0	0	680
Issuance of 9,916, 4,766, 5,920 common shares pursuant to the Deferred Compensation Plan	0	19	63	0	0	0	0	82
Issuance of 19,000, 19,414, 9,693 common shares pursuant to the First Retirement & Savings Plan	0	78	264	0	0	0	0	342
Purchase of 160,803, 136,380, 128,073 treasury shares	0	0	0	0	0	0	(2,499)	(2,499)
Deferred compensation	0	0	0	0	35	0	(35)	0
Tax benefit related to deferred compensation distributions	0	0	33	0	0	0	0	33
Issuance of 37,266, 49,500, 11,392 common shares pursuant to the exercise of stock options	0	198	349	0	0	0	0	547
Tax benefit related to exercise of incentive stock options	0	0	80	0	0	0	0	80
Tax benefit related to exercise of non-qualified stock options	0	0	45	0	0	0	0	45
Vested stock options compensation expense	0	0	52	0	0	0	0	52
Balance at Dec. 31, 2010	24,635	29,909	28,223	66,356	2,929	(2,066)	(37,721)	112,265
Comprehensive income:
Net income	0	0	0	11,372	0	0	0	11,372
Net unrealized change in available-for-sale investment securities	0	0	0	0	0	5,214	0	5,214
Total Comprehensive Income								16,586
Dividends on preferred stock ($370, $455, $407 per share)	0	0	0	(3,576)	0	0	0	(3,576)
Dividends on common stock ($.38, $.38, $.40 per share)	0	0	0	(2,413)	0	0	0	(2,413)
Issuance of 4,927, 0, 3,850 shares of preferred stock	19,150	0	0	0	0	0	0	19,150
Issuance of 44,661, 38,494, 44,521 common shares pursuant to the Dividend Reinvestment Plan	0	178	629	0	0	0	0	807
Issuance of 9,916, 4,766, 5,920 common shares pursuant to the Deferred Compensation Plan	0	23	85	0	0	0	0	108
Issuance of 19,000, 19,414, 9,693 common shares pursuant to the First Retirement & Savings Plan	0	39	138	0	0	0	0	177
Issuance of 0, 0, 4,436 restricted common shares pursuant to the 2007 Stock Incentive Plan	0	18	65	0	0	0	0	83
Purchase of 160,803, 136,380, 128,073 treasury shares	0	0	0	0	0	0	(2,385)	(2,385)
Deferred compensation	0	0	0	0	(25)	0	(83)	(108)
Tax benefit related to deferred compensation distributions	0	0	19	0	0	0	0	193
Grant of restricted stock units pursuant to the 2007 Stock Incentive Plan	0	0	70	0	0	0	0	70
Issuance of 37,266, 49,500, 11,392 common shares pursuant to the exercise of stock options	0	45	76	0	0	0	0	121
Tax benefit related to exercise of incentive stock options	0	0	11	0	0	0	0	11
Vested stock options compensation expense	0	0	52	0	0	0	0	52
Balance at Dec. 31, 2011	$ 43,785	$ 30,212	$ 29,368	$ 71,739	$ 2,904	$ 3,148	$ (40,189)	$ 140,967