Note 3 - Loans and Allowance for Loan Losses (Detail) - Past Due Status of Loans Held in Portfolio (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
30–59 Days Past Due	$ 25,751	$ 33,465
60–89 Days Past Due	5,954	10,389
90 Days & Over Past Due	5,393	6,167
Total Past Due	37,098	50,021
Current	1,643,291	1,599,732
Total Loans	1,680,389	1,649,753
MEMO 90 & Over and Still Accruing	165	245
Commercial and Industrial [Member]
30–59 Days Past Due	23,092	28,711
60–89 Days Past Due	4,786	7,541
90 Days & Over Past Due	1,538	2,641
Total Past Due	29,416	38,893
Current	606,401	588,892
Total Loans	635,817	627,785
MEMO 90 & Over and Still Accruing	49	146
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	379,788	348,809
Total Loans	379,788	348,809
MEMO 90 & Over and Still Accruing	0	0
Factored Receivables [Member]
30–59 Days Past Due	1,457	3,122
60–89 Days Past Due	206	1,339
90 Days & Over Past Due	290	99
Total Past Due	1,953	4,560
Current	146,647	147,033
Total Loans	148,600	151,593
MEMO 90 & Over and Still Accruing	116	99
Equipment Financing Receivables [Member]
30–59 Days Past Due	470	159
60–89 Days Past Due	216	284
90 Days & Over Past Due	36	339
Total Past Due	722	782
Current	168,588	161,312
Total Loans	169,310	162,094
MEMO 90 & Over and Still Accruing	0	0
Real Estate Residential Mortgage [Member]
30–59 Days Past Due	732	1,464
60–89 Days Past Due	746	1,208
90 Days & Over Past Due	2,754	2,325
Total Past Due	4,232	4,997
Current	152,011	146,612
Total Loans	156,243	151,609
MEMO 90 & Over and Still Accruing	0	0
Commercial Mortgage [Member]
30–59 Days Past Due	0	0
60–89 Days Past Due	0	0
90 Days & Over Past Due	745	745
Total Past Due	745	745
Current	153,591	181,990
Total Loans	154,336	182,735
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	13,345	13,277
Total Loans	13,345	13,277
MEMO 90 & Over and Still Accruing	0	0
Loans To Individual [Member]
30–59 Days Past Due	0	9
60–89 Days Past Due	0	17
90 Days & Over Past Due	30	18
Total Past Due	30	44
Current	22,920	11,807
Total Loans	22,950	11,851
MEMO 90 & Over and Still Accruing	0	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	0	0
Total Loans	0	0
MEMO 90 & Over and Still Accruing	$ 0	$ 0