Note 10 - Income Taxes (Details) - The Components of the Net Deferred Tax Assets (Liabilities): (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax asset:
Postretirement benefits	$ 4,880	$ 4,114
Allowance for loan losses	13,895	13,592
Stock based compensation	2,322	2,373
Depreciation	1,400	1,212
Unrealized loss on securities available for sale	6,612
Fair value adjustment on financial assets carried at fair value	2,470	3,152
Other-than-temporary impairment charges	1,584	2,700
Adjustment required to recognize funded status of postretirement pension plans	2,218	5,266
Other	2,336	1,991
Deferred tax asset	37,717	34,400
Deferred tax liability:
Core deposit intangibles		205
Valuation differences resulting from acquired assets and liabilities	2,805	2,849
Fair value adjustment on financial liabilities carried at fair value	14,910	15,781
Unrealized gains on securities available for sale		14,697
Other	1,898	1,705
Deferred tax liability	19,613	35,237
Net deferred tax (liability) asset included in other (liabilities) assets	$ 18,104	$ (837)