Note 9 - Income Taxes (Detail) - Significant Temporary Differences that Comprise Deferred Tax Assets Tax Effect (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Assets
Allowance for loan losses	$ 8,571	$ 9,907
Deferred directors’ fees	281	280
Postretirement benefit obligations	5,633	5,057
Other real estate owned	2,398	1,422
Partnership investments	1,444	1,395
Self-funded insurance	164	169
Paid time off	705	656
Depreciation	676	140
Intangibles	3,526	3,749
Other	44	82
Total deferred tax assets	23,442	22,857
Liabilities
Unrealized gains on available for sale investment securities, net	5,066	4,854
Prepaid expenses	505	628
Federal Home Loan Bank stock dividends	1,087	1,080
Deferred loan fees	811	852
Lease financing operations	366	758
Total deferred tax liabilities	7,835	8,172
Net deferred tax asset	$ 15,607	$ 14,685