Note 11 - Income Taxes (Detail) - Components of net deferred tax asset (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax asset
Allowance for credit losses	$ 13,700	$ 14,683
State franchise taxes	4,162	4,584
Deferred compensation	8,278	8,083
Real estate owned	2,211	1,177
Purchased assets and assumed liabilities	4,732
Post-retirement benefits	1,210	1,236
Employee benefit accruals	5,648	5,462
VISA Class B shares	1,479	866
Limited partnership investments	1,037	993
Impaired capital assets	20,819	21,058
Capital loss carryforward	47	548
Premises and equipment	444	242
Other	64	33
Subtotal deferred tax asset	63,831	58,965
Deferred tax liability
Net deferred loan fees	429	500
Intangible assets	9,219	11,296
Securities available for sale	10,741	8,404
Leases	752	934
Purchased assets and assumed liabilities		90
Other	241	126
Total deferred tax liability	21,382	21,350
Net deferred tax asset	42,449	37,615
Total deferred tax asset	$ 63,831	$ 58,965