Consolidated Statements of Changes in Stockholders’ Equity (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Number of shares issued upon the exercise of stock options (in Shares)	150,225
Number of shares purchased for the Treasury (in Shares)	352,000	624,088
Amortization of prior service costs (credit), taxes (in Dollars)	$ 436	$ 223	$ 120
Common Stock [Member]
Number of shares issued upon the exercise of stock options (in Shares)		155,061	37,054
Shares issued upon vesting of restricted stock unit awards (in Shares)		119,600	87,821
Additional Paid-in Capital [Member]
Number of shares issued upon the exercise of stock options (in Shares)	125,405	155,061	74,340
Shares issued upon vesting of restricted stock unit awards (in Shares)	113,272	127,653	103,109
Release of shares from Employee Benefit Trust, shares (in Shares)	157,922	144,312	134,124
Treasury Stock [Member] | Purchase of Common Shares Outstanding [Member]
Number of shares purchased for the Treasury (in Shares)	352,000	624,088
Treasury Stock [Member] | Restricted Stock Awards Repurchased To Satisfy Tax Obligations [Member]
Number of shares purchased for the Treasury (in Shares)	40,148	29,838	26,443
Treasury Stock [Member] | Shares Purchased To Fund Options Exercised [Member]
Number of shares purchased for the Treasury (in Shares)	65,074	3,794	26,011
Treasury Stock [Member]
Number of shares issued upon the exercise of stock options (in Shares)	150,225	23,249	37,266
Shares issued upon vesting of restricted stock unit awards (in Shares)	146,149	8,053	18,583
Unearned Compensation [Member]
Release of shares from Employee Benefit Trust, shares (in Shares)			168,759
Retained Earnings [Member]
Number of shares issued upon the exercise of stock options (in Shares)	24,820	23,129	74,320
Shares issued upon vesting of restricted stock unit awards (in Shares)	32,877	7,853	3,295
Cash dividends declared and paid on preferred shares, cumulative preferred dividends (in Dollars per share)	$ 0.52	$ 0.52	$ 0.52
Accumulated Other Comprehensive Income (Loss) [Member]
Amortization of prior service costs (credit), taxes (in Dollars)	20	20	20
Amortization of net actuarial losses, taxes (in Dollars)	(456)	(243)	(140)
Unrecognized actuarial (losses) gains, taxes (in Dollars)	340	1,932	513
Change in net unrealized gains on securities available for sale, taxes (in Dollars)	(5,259)	(7,706)	(1,810)
Reclassification adjustment for losses (gains) included in net income, taxes (in Dollars)	$ (318)	$ (692)	$ (904)