Note 4 - Loans (Detail) - Carrying Amount of Loans Prior to Transfer to Held-for-Sale (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011	Sep. 30, 2012		Sep. 30, 2011	Dec. 31, 2011
Carrying Amount of Loans Prior to transfer to held-for-sale	$ 171,052
Charge-offs at Date of Transfer	80,260		1,596	82,647		1,796
Carrying Amount	90,011	[1]		90,011	[1]		4,200
Pass [Member] | Commercial And Industrial [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	2,868
Pass [Member] | Office Retail And Industrial [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	4,272
Pass [Member] | Other Commercial Real Estate [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	855
Pass [Member] | Total Commercial Real Estate [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	5,127
Pass [Member] | Home Equity1 [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	1,303
Pass [Member] | 1-4 Family Mortgages [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	160
Pass [Member] | Total Consumer Loans [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	1,463
Pass [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	9,458
Substandard/Special Mention [Member] | Commercial And Industrial [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	23,728
Substandard/Special Mention [Member] | Agricultural [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	7,411
Substandard/Special Mention [Member] | Office Retail And Industrial [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	24,975
Substandard/Special Mention [Member] | Multi-Family [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	2,380
Substandard/Special Mention [Member] | Residential Construction [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	7,953
Substandard/Special Mention [Member] | Commercial Construction [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	2,032
Substandard/Special Mention [Member] | Other Commercial Real Estate [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	29,602
Substandard/Special Mention [Member] | Total Commercial Real Estate [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	66,942
Substandard/Special Mention [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	98,081
Substandard Non-Accrual [Member] | Commercial And Industrial [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	21,796
Substandard Non-Accrual [Member] | Agricultural [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	1,308
Substandard Non-Accrual [Member] | Office Retail And Industrial [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	20,653
Substandard Non-Accrual [Member] | Multi-Family [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	1,829
Substandard Non-Accrual [Member] | Residential Construction [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	6,900
Substandard Non-Accrual [Member] | Commercial Construction [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	2,026
Substandard Non-Accrual [Member] | Other Commercial Real Estate [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	8,971
Substandard Non-Accrual [Member] | Total Commercial Real Estate [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	40,379
Substandard Non-Accrual [Member] | Home Equity1 [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	30
Substandard Non-Accrual [Member] | Total Consumer Loans [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	30
Substandard Non-Accrual [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	63,513
Commercial And Industrial [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	48,392
Charge-offs at Date of Transfer	22,508
Carrying Amount	25,101	[1]		25,101	[1]
Agricultural [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	8,719
Charge-offs at Date of Transfer	4,356
Carrying Amount	4,353	[1]		4,353	[1]
Office Retail And Industrial [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	49,900
Charge-offs at Date of Transfer	23,696
Carrying Amount	26,144	[1]		26,144	[1]
Multi-Family [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	4,209
Charge-offs at Date of Transfer	1,859
Carrying Amount	2,349	[1]		2,349	[1]
Residential Construction [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	14,853
Charge-offs at Date of Transfer	5,690
Carrying Amount	9,252	[1]		9,252	[1]
Commercial Construction [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	4,058
Charge-offs at Date of Transfer	1,850
Carrying Amount	2,208	[1]		2,208	[1]
Other Commercial Real Estate [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	39,428
Charge-offs at Date of Transfer	19,438
Carrying Amount	19,976	[1]		19,976	[1]
Total Commercial Real Estate [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	112,448
Charge-offs at Date of Transfer	52,533
Carrying Amount	59,929	[1]		59,929	[1]
Home Equity1 [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	1,333
Charge-offs at Date of Transfer	773
Carrying Amount	558	[1]		558	[1]
1-4 Family Mortgages [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	160
Charge-offs at Date of Transfer	90
Carrying Amount	70	[1]		70	[1]
Total Consumer Loans [Member]
Carrying Amount of Loans Prior to transfer to held-for-sale	1,493
Charge-offs at Date of Transfer	863
Carrying Amount	$ 628	[1]		$ 628	[1]

[1] The carrying amount as of September 30, 2012 includes $781,000 in payments received subsequent to the charge-offs at the date of transfer to held-for-sale.