CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parentheticals) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Statement of Stockholders' Equity [Abstract]
Income tax expense on unrealized gains on securities	$ 998	$ 729	$ 5,724
Income tax expense (benefit) on reclassification adjustments for net realized (gains) losses on securities included in net income	229	172	(2,258)
Income tax benefit on credit-related OTTI realized losses transferred to net income	(49)	(61)	0
Income tax (benefit) expense on defined benefit plan obligation adjustment	(3,743)	240	1,605
Income tax (benefit) expense on unrealized (losses) gains on flow hedges	(522)	(507)	7
Income tax expense (benefit) on reclassification adjustment for net realized gains (losses) on cash flow hedges included in net income	269	139	(28)
Income tax benefit on cumulative effect adjustment of change in accounting principle	0	0	(663)
Income tax benefit on noncredit-related losses on securties not expected to be sold	$ 0	$ 0	$ (1,252)