Note 5 - Fair Value Measurements (Detail) - The Carrying Amounts and Estimated Fair Values of the Company’s Financial Instruments (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 71,001	$ 94,309	$ 98,506	$ 182,056
Held to maturity investment securities	875	875
Loans, net	1,013,326	1,043,844
Liabilities
Deposits	1,407,448	1,435,065
Federal funds purchased and other short-term borrowings	21,989	27,022
Securities sold under agreements to repurchase and other long-term borrowings	180,464	190,694
Subordinated notes payable to unconsolidated trusts	48,970	48,970
Carrying Amount [Member]
Assets
Cash and cash equivalents	71,001	94,309
Held to maturity investment securities	875	875
Loans, net	1,013,326	1,043,844
Accrued interest receivable	6,110	6,619
Liabilities
Deposits	1,407,448	1,435,065
Federal funds purchased and other short-term borrowings	21,989	27,022
Securities sold under agreements to repurchase and other long-term borrowings	180,464	190,694
Subordinated notes payable to unconsolidated trusts	48,970	48,970
Accrued interest payable	2,065	2,375
Fair Value [Member]
Assets
Cash and cash equivalents	71,001	94,309
Held to maturity investment securities	997	974
Loans, net	1,009,964	1,043,824
Accrued interest receivable	6,110	6,619
Liabilities
Deposits	1,411,919	1,441,490
Federal funds purchased and other short-term borrowings	21,989	27,022
Securities sold under agreements to repurchase and other long-term borrowings	201,514	212,176
Subordinated notes payable to unconsolidated trusts	20,173	20,982
Accrued interest payable	2,065	2,375
Fair Value, Inputs, Level 1 [Member]
Assets
Cash and cash equivalents	71,001	94,309
Liabilities
Deposits	824,046	787,396
Fair Value, Inputs, Level 2 [Member]
Assets
Held to maturity investment securities	997	974
Accrued interest receivable	6,110	6,619
Liabilities
Federal funds purchased and other short-term borrowings	21,989	27,022
Securities sold under agreements to repurchase and other long-term borrowings	201,514	212,176
Accrued interest payable	2,065	2,375
Fair Value, Inputs, Level 3 [Member]
Assets
Loans, net	1,009,964	1,043,824
Liabilities
Deposits	587,873	654,094
Subordinated notes payable to unconsolidated trusts	$ 20,173	$ 20,982