CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands	Preferred Stock [Member]	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
BALANCE at Dec. 31, 2010	$ 21,124	$ 229,722	$ 21,175	$ 539	$ 272,560
BALANCE (in shares) at Dec. 31, 2010		19,286
Net income	0	0	33,777	0	33,777
Other comprehensive income, net of tax:	0	0	0	6,898	6,898
Redemption of stock pursuant to stock plans	0	(531)	0	0	(531)
Redemption of stock pursuant to stock plans (in shares)		(55)
Activity in deferred compensation plan	0	(27)	0	0	(27)
Activity in deferred compensation plan (in shares)		(3)
Issuance of common stock-stock options	0	80	0	0	80
Issuance of common stock-stock options (in shares)		7
Issuance of common stock-restricted stock	0	0	0	0	0
Issuance of common stock-restricted stock (in shares)		64
Stock based compensation expense	0	1,899	0	0	1,899
Tax adjustment associated with stock plans	0	(159)	0	0	(159)
Fractional share payment	0	(18)	0	0	(18)
Fractional share payment (in shares)		(1)
BALANCE at Dec. 31, 2011	21,124	230,966	54,952	7,437	314,479
BALANCE (in shares) at Dec. 31, 2011		19,298
Net income	0	0	17,767	0	17,767
Other comprehensive income, net of tax:	0	0	0	3,977	3,977
Cash dividends, $.05 per common share	0	0	(1,027)	0	(1,027)
Redemption of stock pursuant to stock plans	0	(499)	0	0	(499)
Redemption of stock pursuant to stock plans (in shares)		(45)
Activity in deferred compensation plan	0	53	0	0	53
Activity in deferred compensation plan (in shares)		(1)
Issuance of common stock-stock options	0	92	0	0	92
Issuance of common stock-stock options (in shares)		8
Issuance of common stock-restricted stock	0	0	0	0	0
Issuance of common stock-restricted stock (in shares)		30
Stock based compensation expense	0	1,168	0	0	1,168
Tax adjustment associated with stock plans	0	(14)	0	0	(14)
Fractional share payment					0
BALANCE at Sep. 30, 2012	$ 21,124	$ 231,766	$ 71,692	$ 11,414	$ 335,996
BALANCE (in shares) at Sep. 30, 2012		19,290