CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Preferred Stock [Member]	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income, Net of Taxes [Member]	Total
Balance at Dec. 31, 2008	$ 27,055	$ 51,965	$ 46,138	$ 388	$ 125,546
Balance (in shares) at Dec. 31, 2008		5,146,798
Comprehensive Income:
Net income	0	0	12,765	0	12,765
Other comprehensive income
Net change in unrealized gain on available for sale securities (net of tax effect)	0	0	0	230	230
Comprehensive income	0	0	12,765	230	12,995
Accretion of preferred stock	945	0	(945)	0	0
Repurchase of preferred stock	(28,000)	0	0	0	(28,000)
Stock options exercised (in shares)		61,175
Stock options exercised	0	873	0	0	873
Excess tax benefit - stock-based compensation	0	291	0	0	291
Stock issued under employee stock purchase plan (in shares)		894
Stock issued under employee stock purchase plan	0	24	0	0	24
Restricted stock granted (in shares)		11,575
Restricted stock granted	0	0	0	0	0
Restricted stock forfeited / cancelled	0	0	0	0	0
Stock-based compensation - stock options	0	330	0	0	330
Stock-based compensation - restricted stock	0	73	0	0	73
Cash dividends paid on common stock	0	0	(2,960)	0	(2,960)
Dividends on preferred stock	0	0	(354)	0	(354)
Stock issued in payment of director fees (in shares)		9,087
Stock issued in payment of director fees	0	233	0	0	233
Balance at Dec. 31, 2009	0	53,789	54,644	618	109,051
Balance (in shares) at Dec. 31, 2009		5,229,529
Comprehensive Income:
Net income	0	0	13,552	0	13,552
Other comprehensive income
Net change in unrealized gain on available for sale securities (net of tax effect)	0	0	0	928	928
Comprehensive income	0	0	13,552	928	14,480
Accretion of preferred stock	0	0	0	0	0
Repurchase of preferred stock	0	0	0	0	0
Stock options exercised (in shares)		49,940
Stock options exercised	0	895	0	0	895
Excess tax benefit - stock-based compensation	0	132	0	0	132
Stock issued under employee stock purchase plan (in shares)		563
Stock issued under employee stock purchase plan	0	17	0	0	17
Restricted stock granted (in shares)		6,150
Restricted stock granted	0	0	0	0	0
Restricted stock forfeited/cancelled (in shares)		(2,320)
Restricted stock forfeited / cancelled	0	0	0	0	0
Stock-based compensation - stock options	0	241	0	0	241
Stock-based compensation - restricted stock	0	109	0	0	109
Cash dividends paid on common stock	0	0	(3,205)	0	(3,205)
Dividends on preferred stock	0	0	0	0	0
Stock issued in payment of director fees (in shares)		6,220
Stock issued in payment of director fees	0	200	0	0	200
Balance at Dec. 31, 2010	0	55,383	64,991	1,546	121,920
Balance (in shares) at Dec. 31, 2010		5,290,082			5,290,082
Comprehensive Income:
Net income	0	0	15,564	0	15,564
Other comprehensive income
Net change in unrealized gain on available for sale securities (net of tax effect)	0	0	0	53	53
Comprehensive income	0	0	15,564	0	15,564
Stock options exercised (in shares)		34,913
Stock options exercised	0	741	0	0	741
Excess tax benefit - stock-based compensation	0	120	0	0	120
Stock issued under employee stock purchase plan (in shares)		982
Stock issued under employee stock purchase plan	0	33	0	0	33
Restricted stock granted (in shares)		5,675
Restricted stock granted	0	0	0	0	0
Restricted stock forfeited/cancelled (in shares)		(315)
Restricted stock forfeited / cancelled	0	0	0	0	0
Stock-based compensation - stock options	0	234	0	0	234
Stock-based compensation - restricted stock	0	143	0	0	143
Cash dividends paid on common stock	0	0	(3,457)	0	(3,457)
Dividends on preferred stock	0	0	0	0	0
Stock issued in payment of director fees (in shares)		5,590
Stock issued in payment of director fees	0	200	0	0	200
Balance at Dec. 31, 2011	$ 0	$ 56,854	$ 77,098	$ 1,599	$ 135,551
Balance (in shares) at Dec. 31, 2011		5,336,927			5,336,927