Note 18 - Fair Value Measurements (Detail) - The Carrying Amounts and Estimated Fair Values of the Company’s Financial Instruments (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Assets
Cash and cash equivalents	$ 95,855	$ 94,309	$ 182,056	$ 218,336
Held to maturity investment securities	820	875
Loans, net	980,550	1,043,844
Accrued interest receivable	6,100	6,600
Federal Home Loan Bank and Federal Reserve Bank Stock	9,500	9,500
Liabilities
Deposits	1,410,810	1,435,065
Federal funds purchased and other short-term borrowings	24,083	27,022
Securities sold under agreements to repurchase and other long-term borrowings	129,297	190,694
Subordinated notes payable to unconsolidated trusts	48,970	48,970
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Assets
Cash and cash equivalents	95,855	94,309
Held to maturity investment securities	820	875
Loans, net	980,550	1,043,844
Accrued interest receivable	6,074	6,619
Federal Home Loan Bank and Federal Reserve Bank Stock	9,516	9,516
Liabilities
Deposits	1,410,810	1,435,065
Federal funds purchased and other short-term borrowings	24,083	27,022
Securities sold under agreements to repurchase and other long-term borrowings	129,297	190,694
Subordinated notes payable to unconsolidated trusts	48,970	48,970
Accrued interest payable	1,370	2,375
Estimate of Fair Value, Fair Value Disclosure [Member]
Assets
Cash and cash equivalents	95,855	94,309
Held to maturity investment securities	956	974
Loans, net	979,301	1,043,824
Accrued interest receivable	6,074	6,619
Liabilities
Deposits	1,414,395	1,441,490
Federal funds purchased and other short-term borrowings	24,083	27,022
Securities sold under agreements to repurchase and other long-term borrowings	148,680	212,176
Subordinated notes payable to unconsolidated trusts	21,015	20,982
Accrued interest payable	1,370	2,375
Fair Value, Inputs, Level 1 [Member]
Assets
Cash and cash equivalents	95,855	94,309
Liabilities
Deposits	870,145	787,396
Fair Value, Inputs, Level 2 [Member]
Assets
Held to maturity investment securities	956	974
Accrued interest receivable	6,074	6,619
Liabilities
Federal funds purchased and other short-term borrowings	24,083	27,022
Securities sold under agreements to repurchase and other long-term borrowings	148,680	212,176
Accrued interest payable	1,370	2,375
Fair Value, Inputs, Level 3 [Member]
Assets
Loans, net	979,301	1,043,824
Liabilities
Deposits	544,250	654,094
Subordinated notes payable to unconsolidated trusts	$ 21,015	$ 20,982