Note 5 - Loans and Allowance for Loan Losses (Detail) - Past Due Status of Loans Held in Portfolio (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
30–59 Days Past Due	$ 33,465	$ 29,088
60–89 Days Past Due	10,389	7,035
90 Days & Over Past Due	6,167	6,523
Total Past Due	50,021	42,646
Current	1,599,732	1,430,663
Total Loans	1,649,753	1,473,309
MEMO 90 & Over and Still Accruing	245	165
Commercial and Industrial [Member]
30–59 Days Past Due	28,711	23,665
60–89 Days Past Due	7,541	5,344
90 Days & Over Past Due	2,641	837
Total Past Due	38,893	29,846
Current	588,892	594,278
Total Loans	627,785	624,124
MEMO 90 & Over and Still Accruing	146	165
Loans To Non Depository Institutions [Member]
30–59 Days Past Due	0	0
60–89 Days Past Due	0	0
90 Days & Over Past Due	0	0
Total Past Due	0	0
Current	348,809	246,587
Total Loans	348,809	246,587
MEMO 90 & Over and Still Accruing	0	0
Factored Receivables [Member]
30–59 Days Past Due	3,122	3,266
60–89 Days Past Due	1,339	665
90 Days & Over Past Due	99	162
Total Past Due	4,560	4,093
Current	147,033	167,738
Total Loans	151,593	171,831
MEMO 90 & Over and Still Accruing	99
Equipment Financing Receivables [Member]
30–59 Days Past Due	159	546
60–89 Days Past Due	284	386
90 Days & Over Past Due	339	370
Total Past Due	782	1,302
Current	161,312	149,480
Total Loans	162,094	150,782
Real Estate Residential Mortgage [Member]
30–59 Days Past Due	1,464	1,570
60–89 Days Past Due	1,208	633
90 Days & Over Past Due	2,325	1,991
Total Past Due	4,997	4,194
Current	146,612	165,959
Total Loans	151,609	170,153
Commercial Mortgage [Member]
30–59 Days Past Due		0
60–89 Days Past Due	0	0
90 Days & Over Past Due	745	3,124
Total Past Due	745	3,124
Current	181,990	82,701
Total Loans	182,735	85,825
MEMO 90 & Over and Still Accruing	0	0
Commercial Real Estate Construction and Land Development [Member]
30–59 Days Past Due	0	0
60–89 Days Past Due	0	0
90 Days & Over Past Due	0	0
Total Past Due	0	0
Current	13,277	13,621
Total Loans	13,277	13,621
MEMO 90 & Over and Still Accruing	0	0
Loans To Individual [Member]
30–59 Days Past Due	9	41
60–89 Days Past Due	17	7
90 Days & Over Past Due	18	39
Total Past Due	44	87
Current	11,807	10,289
Total Loans	11,851	10,376
MEMO 90 & Over and Still Accruing	0
Loans To Depository Institutions [Member]
30–59 Days Past Due	0	0
60–89 Days Past Due	0	0
90 Days & Over Past Due	0	0
Total Past Due	0	0
Current		10
Total Loans		10
MEMO 90 & Over and Still Accruing	$ 0	$ 0