CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Balance at Dec. 31, 2008	$ 161,089	$ 19,695	$ 131,112	$ 34,021	$ (23,115)	$ (1,096)	$ 472
Comprehensive income:
Net Income	45,863			44,396			1,467
Net unrealized gains on securities, net of tax	24,225					24,225
Reclassification adjustment for gains on sales of available for sale securities included in net income, net of tax	(21,740)					(21,740)
Noncredit portion of other-than-temporary impairment losses on available for sale securities, net of tax	(1,775)					(1,775)
Reclassification of other-than-temporary impairment charges on available for sale securities included in net income, net of tax	1,950					1,950
Adjustment to net periodic benefit cost, net of tax	2,665					2,665
Total comprehensive income	51,188
Issuance of common stock	2,300	347	1,953
Purchase of common stock	(430)				(430)
Tax benefit of incentive stock options	651		651
Capital distribution to noncontrolling interest shareholders	(1,471)						(1,471)
Dividends paid on common stock	(11,078)			(11,078)
Stock dividend declared	0	886	12,641	(13,527)
Balance at Dec. 31, 2009	202,249	20,928	146,357	53,812	(23,545)	4,229	468
Comprehensive income:
Net Income	40,058			39,103			955
Net unrealized gains on securities, net of tax	9,764					9,764
Reclassification adjustment for gains on sales of available for sale securities included in net income, net of tax	(16,763)					(16,763)
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	(3,595)					(3,595)
Total comprehensive income	29,536
Issuance of common stock	1,823	204	1,619
Purchase of common stock	(4,832)				(4,832)
Tax benefit of incentive stock options	331		331
Capital distribution to noncontrolling interest shareholders	(310)						(310)
Dividends paid on common stock	(13,223)			(13,223)
Stock dividend declared	0	943	14,570	(15,513)
Balance at Dec. 31, 2010	215,574	22,075	162,877	64,179	(28,377)	(6,293)	1,113
Comprehensive income:
Net Income	40,491			39,133			1,358
Net unrealized gains on securities, net of tax	34,129					34,129
Reclassification adjustment for gains on sales of available for sale securities included in net income, net of tax	(7,667)					(7,667)
Adjustment to net periodic benefit cost, net of tax	(5,448)					(5,448)
Total comprehensive income	61,505
Issuance of common stock	1,481	90	1,391
Stock compensation expense	261		261
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	(14,671)			(14,671)
Stock dividend declared	0	981	15,014	(15,995)
Balance at Dec. 31, 2011	$ 258,927	$ 23,146	$ 176,791	$ 72,646	$ (28,377)	$ 14,721	$ 0