CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (UNAUDITED) (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Paid In Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Balance at Dec. 31, 2009	$ 202,249	$ 20,928	$ 146,357	$ 53,812	$ (23,545)	$ 4,229	$ 468
Comprehensive income:
Net income	33,246			31,945			1,301
Net unrealized gains on available for sale securities, net of tax	13,669					13,669
Reclassification adjustment for gains on sales of available for sale securities included in net income, net of tax	(14,966)					(14,966)
Noncredit portion of other-than-temporary impairment losses on available for sale securities, net of tax	23					23
Reclassification of other-than-temporary impairment charges on available for sale securities included in net income, net of tax	49					49
Adjustment to net periodic benefit cost, net of tax	611					611
Total comprehensive income	32,632
Issuance of common stock	1,251	171	1,080
Purchase of common stock	(4,716)				(4,716)
Tax benefit of incentive stock options	328		328
Capital distribution to noncontrolling interest shareholders	(310)						(310)
Dividends paid on common stock	(7,916)			(7,916)
Stock dividend declared	0	943	14,570	(15,513)
Balance at Sep. 30, 2010	223,518	22,042	162,335	62,328	(28,261)	3,615	1,459
Balance at Dec. 31, 2010	215,574	22,075	162,877	64,179	(28,377)	(6,293)	1,113
Comprehensive income:
Net income	30,928			29,570			1,358
Net unrealized gains on available for sale securities, net of tax	30,551					30,551
Reclassification adjustment for gains on sales of available for sale securities included in net income, net of tax	(5,902)					(5,902)
Adjustment to net periodic benefit cost, net of tax	693					693
Total comprehensive income	56,270
Issuance of common stock	860	56	804
Stock compensation expense	143		143
Tax benefit of incentive stock options	2		2
Capital distribution to noncontrolling interest shareholders	(475)						(475)
Purchase of noncontrolling interest	(4,750)		(2,754)				(1,996)
Dividends paid on common stock	(8,414)			(8,414)
Stock dividend declared	0	981	15,014	(15,995)
Balance at Sep. 30, 2011 (Restated)	$ 259,210	$ 23,112	$ 176,086	$ 69,340	$ (28,377)	$ 19,049	$ 0