Note 5 - 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	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Individually	$ 2,274	$ 2,651
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Collectively	19,911	17,240
Ending Allowance Balance Attributable to Loans Evaluated for Impairment	22,347	20,029	18,238
Loan Balances Evaluated for Impairment Individually	9,392	11,504
Loan Balances Evaluated for Impairment Collectively	1,640,361	1,461,805
Total	1,770,990	1,516,681
Total	1,770,990	1,516,681
Evaluated for Impairment [Member] | Commercial and Industrial [Member]
Total	627,785	624,124
Total	627,785	624,124
Evaluated for Impairment [Member] | Loans To Non Depository Institutions [Member]
Total	348,809	246,587
Total	348,809	246,587
Evaluated for Impairment [Member] | Factored Receivables [Member]
Total	151,593	171,831
Total	151,593	171,831
Evaluated for Impairment [Member] | Equipment Financing Receivables [Member]
Total	162,094	150,782
Total	162,094	150,782
Evaluated for Impairment [Member] | Real Estate Residential Mortgage [Member]
Total	151,609	170,153
Total	151,609	170,153
Evaluated for Impairment [Member] | Commercial Mortgage [Member]
Total	182,735	85,825
Total	182,735	85,825
Evaluated for Impairment [Member] | Commercial Real Estate Construction and Land Development [Member]
Total	13,277	13,621
Total	13,277	13,621
Evaluated for Impairment [Member] | Loans To Individual [Member]
Total	11,851	10,376
Total	11,851	10,376
Evaluated for Impairment [Member] | Loans To Depository Institutions [Member]
Total	0	10
Total	0	10
Evaluated for Impairment [Member] | Unallocated [Member]
Total	0	0
Total	0	0
Evaluated for Impairment [Member]
Total	1,649,753	1,473,309
Total	1,649,753	1,473,309
Commercial and Industrial [Member]
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Individually	325	287
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Collectively	8,337	7,360
Ending Allowance Balance Attributable to Loans Evaluated for Impairment	8,662	7,647	7,454
Loan Balances Evaluated for Impairment Individually	2,406	2,954
Loan Balances Evaluated for Impairment Collectively	625,379	621,170
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	1,726	1,369
Ending Allowance Balance Attributable to Loans Evaluated for Impairment	1,726	1,369	564
Loan Balances Evaluated for Impairment Individually	0	0
Loan Balances Evaluated for Impairment Collectively	348,809	246,587
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	1,447	1,450
Ending Allowance Balance Attributable to Loans Evaluated for Impairment	1,447	1,450	1,424
Loan Balances Evaluated for Impairment Individually	0	0
Loan Balances Evaluated for Impairment Collectively	151,593	171,831
Equipment Financing Receivables [Member]
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Individually	7	17
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Collectively	3,756	3,498
Ending Allowance Balance Attributable to Loans Evaluated for Impairment	3,763	3,515	3,423
Loan Balances Evaluated for Impairment Individually	89	151
Loan Balances Evaluated for Impairment Collectively	162,005	150,631
Real Estate Residential Mortgage [Member]
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Individually	1,592	1,234
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Collectively	2,172	2,256
Ending Allowance Balance Attributable to Loans Evaluated for Impairment	3,764	3,490	2,497
Loan Balances Evaluated for Impairment Individually	6,152	5,275
Loan Balances Evaluated for Impairment Collectively	145,457	164,878
Commercial Mortgage [Member]
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Individually	350	1,113
Ending Allowance Balance Attributable to Loans Evaluated for Impairment Collectively	2,154	1,038
Ending Allowance Balance Attributable to Loans Evaluated for Impairment	2,504	2,151	2,275
Loan Balances Evaluated for Impairment Individually	745	3,124
Loan Balances Evaluated for Impairment Collectively	181,990	82,701
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	156	165
Ending Allowance Balance Attributable to Loans Evaluated for Impairment	156	165	310
Loan Balances Evaluated for Impairment Individually	0	0
Loan Balances Evaluated for Impairment Collectively	13,277	13,621
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	163	104
Ending Allowance Balance Attributable to Loans Evaluated for Impairment	163	104	119
Loan Balances Evaluated for Impairment Individually	0	0
Loan Balances Evaluated for Impairment Collectively	11,851	10,376
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	46
Loan Balances Evaluated for Impairment Individually	0	0
Loan Balances Evaluated for Impairment Collectively	0	10
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	162	138	126
Loan Balances Evaluated for Impairment Individually	0
Loan Balances Evaluated for Impairment Collectively	$ 0	$ 0