Note 6 - Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Detail) - TDRs By Class (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Accruing	$ 17,864		$ 22,371
Commercial And Industrial [Member]
Accruing	1,451	[1]	5,456	[1]
Non-accrual	897	[2]	17,948	[2]
Total	2,348		23,404
Agricultural [Member]
Accruing		[1]	1,986	[1]
Non-accrual		[2]		[2]
Total			1,986
Office Retail And Industrial [Member]
Accruing	1,742	[1]	2,053	[1]
Non-accrual		[2]		[2]
Total	1,742		2,053
Multi-Family [Member]
Accruing	11,107	[1]	103	[1]
Non-accrual	1,758	[2]	3,090	[2]
Total	12,865		3,193
Residential Construction [Member]
Accruing		[1]		[1]
Non-accrual		[2]	8,323	[2]
Total			8,323
Commercial Construction [Member]
Accruing		[1]		[1]
Non-accrual	14,006	[2]		[2]
Total	14,006
Other Commercial Real Estate [Member]
Accruing	227	[1]	4,831	[1]
Non-accrual	11,417	[2]	2,398	[2]
Total	11,644		7,229
Total Commercial Real Estate [Member]
Accruing	13,076	[1]	6,987	[1]
Non-accrual	27,181	[2]	13,811	[2]
Total	40,257		20,798
Total Corporate Loans [Member]
Accruing	14,527	[1]	14,429	[1]
Non-accrual	28,078	[2]	31,759	[2]
Total	42,605		46,188
Home Equity [Member]
Accruing	1,093	[1]	2,644	[1]
Non-accrual	471	[2]	589	[2]
Total	1,564		3,233
1-4 Family Mortgages [Member]
Accruing	2,089	[1]	5,298	[1]
Non-accrual	1,293	[2]	1,405	[2]
Total	3,382		6,703
Installment Loans [Member]
Accruing	155	[1]		[1]
Non-accrual		[2]		[2]
Total	155
Total Consumer Loans [Member]
Accruing	3,337	[1]	7,942	[1]
Non-accrual	1,764	[2]	1,994	[2]
Total	5,101		9,936
Total Loans [Member]
Accruing	17,864	[1]	22,371	[1]
Non-accrual	29,842	[2]	33,753	[2]
Total	$ 47,706		$ 56,124

[1] These loans are still accruing interest.

[2] These loans are included in non-accrual loans in the preceding tables.