Note 3 - Loans and Allowance for Loan Losses (Detail) - Allowance for Loan Losses by Portfolio Segment (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013		Dec. 31, 2012		Mar. 31, 2012
Balance, beginning of period	$ 22,347		$ 20,029		$ 20,105
Charge-offs	2,395	[1]	3,306	[1]
Recoveries	568		382
Net charge-offs	1,827	[1]	2,924	[1]
Provision for loan losses	2,000		3,000
Balance, end of period	22,520		22,347		20,105
Commercial and Industrial [Member]
Balance, beginning of period	8,662		7,647		7,515
Charge-offs	1,322		1,869
Recoveries	250		34
Net charge-offs	1,072		1,835
Provision for loan losses	794		1,703
Balance, end of period	8,384		8,662		7,515
Loans To Non Depository Institutions [Member]
Balance, beginning of period	1,726		1,369		1,265
Charge-offs	0
Recoveries	0		0
Net charge-offs	0
Provision for loan losses	39		(104)
Balance, end of period	1,765		1,726		1,265
Factored Receivables [Member]
Balance, beginning of period	1,447		1,450		1,498
Charge-offs	223		117
Recoveries	3		6
Net charge-offs	220		111
Provision for loan losses	765		159
Balance, end of period	1,992		1,447		1,498
Equipment Financing Receivables [Member]
Balance, beginning of period	3,763		3,515		3,448
Charge-offs	466		1,102
Recoveries	313		338
Net charge-offs	153		764
Provision for loan losses	(356)		697
Balance, end of period	3,254		3,763		3,448
Real Estate Residential Mortgage [Member]
Balance, beginning of period	3,764		3,490		3,746
Charge-offs	361	[1]	131	[1]
Recoveries	2		1
Net charge-offs	359	[1]	130	[1]
Provision for loan losses	586		386
Balance, end of period	3,991		3,764		3,746
Commercial Mortgage [Member]
Balance, beginning of period	2,504		2,151		2,228
Charge-offs	0
Recoveries	0		0
Net charge-offs	0
Provision for loan losses	(45)		77
Balance, end of period	2,459		2,504		2,228
Commercial Real Estate Construction and Land Development [Member]
Balance, beginning of period	156		165		139
Charge-offs	0
Recoveries	0		0
Net charge-offs	0
Provision for loan losses	26		(26)
Balance, end of period	182		156		139
Loans To Individual [Member]
Balance, beginning of period	163		104		125
Charge-offs	23		87
Recoveries	0		3
Net charge-offs	23		84
Provision for loan losses	213		105
Balance, end of period	353		163		125
Loans To Depository Institutions [Member]
Balance, beginning of period	0		0
Charge-offs	0
Recoveries	0		0
Net charge-offs	0
Provision for loan losses	0		0
Balance, end of period	0		0
Unallocated [Member]
Balance, beginning of period	162		138		141
Charge-offs	0
Recoveries	0		0
Net charge-offs	0
Provision for loan losses	(22)		3
Balance, end of period	$ 140		$ 162		$ 141

[1] Includes losses on transfers to OREO