Note 3 - Loans and Allowance for Loan Losses (Detail) - Balance in the Allowance for Loan Losses and the Recorded Investment in Loans by Portfolio Segment (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Individually	$ 2,026	$ 2,274
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Collectively	20,354	19,911
Ending Allowance Balance Attributable to Loans Evaluated for Impairment	22,520	22,347
Loan Balances Evaluated for Impairment Individually	8,043	9,392
Loan Balances Evaluated for Impairment Collectively	1,672,346	1,640,361
Total	1,756,246	1,770,990
Evaluated for Impairment [Member] | Commercial and Industrial [Member]
Total	635,817	627,785
Evaluated for Impairment [Member] | Loans To Non Depository Institutions [Member]
Total	379,788	348,809
Evaluated for Impairment [Member] | Factored Receivables [Member]
Total	148,600	151,593
Evaluated for Impairment [Member] | Equipment Financing Receivables [Member]
Total	169,310	162,094
Evaluated for Impairment [Member] | Real Estate Residential Mortgage [Member]
Total	156,243	151,609
Evaluated for Impairment [Member] | Commercial Mortgage [Member]
Total	154,336	182,735
Evaluated for Impairment [Member] | Commercial Real Estate Construction and Land Development [Member]
Total	13,345	13,277
Evaluated for Impairment [Member] | Loans To Individual [Member]
Total	22,950	11,851
Evaluated for Impairment [Member] | Loans To Depository Institutions [Member]
Total	0	0
Evaluated for Impairment [Member] | Unallocated [Member]
Total	0	0
Evaluated for Impairment [Member]
Total	1,680,389	1,649,753
Commercial and Industrial [Member]
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Individually	172	325
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Collectively	8,212	8,337
Ending Allowance Balance Attributable to Loans Evaluated for Impairment	8,384	8,662
Loan Balances Evaluated for Impairment Individually	990	2,406
Loan Balances Evaluated for Impairment Collectively	634,827	625,379
Loans To Non Depository Institutions [Member]
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Individually	0	0
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Collectively	1,765	1,726
Ending Allowance Balance Attributable to Loans Evaluated for Impairment	1,765	1,726
Loan Balances Evaluated for Impairment Individually	0	0
Loan Balances Evaluated for Impairment Collectively	379,788	348,809
Factored Receivables [Member]
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Individually	0	0
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Collectively	1,992	1,447
Ending Allowance Balance Attributable to Loans Evaluated for Impairment	1,992	1,447
Loan Balances Evaluated for Impairment Individually	174	0
Loan Balances Evaluated for Impairment Collectively	148,426	151,593
Equipment Financing Receivables [Member]
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Individually	7	7
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Collectively	3,247	3,756
Ending Allowance Balance Attributable to Loans Evaluated for Impairment	3,254	3,763
Loan Balances Evaluated for Impairment Individually	84	89
Loan Balances Evaluated for Impairment Collectively	169,226	162,005
Real Estate Residential Mortgage [Member]
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Individually	1,497	1,592
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Collectively	2,494	2,172
Ending Allowance Balance Attributable to Loans Evaluated for Impairment	3,991	3,764
Loan Balances Evaluated for Impairment Individually	6,050	6,152
Loan Balances Evaluated for Impairment Collectively	150,193	145,457
Commercial Mortgage [Member]
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Individually	350	350
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Collectively	2,109	2,154
Ending Allowance Balance Attributable to Loans Evaluated for Impairment	2,459	2,504
Loan Balances Evaluated for Impairment Individually	745	745
Loan Balances Evaluated for Impairment Collectively	153,591	181,990
Commercial Real Estate Construction and Land Development [Member]
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Individually	0	0
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Collectively	182	156
Ending Allowance Balance Attributable to Loans Evaluated for Impairment	182	156
Loan Balances Evaluated for Impairment Individually	0	0
Loan Balances Evaluated for Impairment Collectively	13,345	13,277
Loans To Individual [Member]
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Individually	0	0
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Collectively	353	163
Ending Allowance Balance Attributable to Loans Evaluated for Impairment	353	163
Loan Balances Evaluated for Impairment Individually	0	0
Loan Balances Evaluated for Impairment Collectively	22,950	11,851
Loans To Depository Institutions [Member]
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Individually	0	0
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Collectively	0	0
Ending Allowance Balance Attributable to Loans Evaluated for Impairment	0	0
Loan Balances Evaluated for Impairment Individually	0	0
Loan Balances Evaluated for Impairment Collectively	0	0
Unallocated [Member]
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Individually	0	0
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Collectively	0	0
Ending Allowance Balance Attributable to Loans Evaluated for Impairment	140	162
Loan Balances Evaluated for Impairment Individually	0	0
Loan Balances Evaluated for Impairment Collectively	$ 0	$ 0