Note 11 - Fair Value (Details) - Carrying Value And Estimated Fair Values Of Financial Instruments (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011	Sep. 30, 2009
Level 2 inputs:
Cash and cash equivalents	$ 126,568	$ 159,449	$ 208,259	$ 193,609
Interest-bearing deposits in banks	15,501	15,321
Investment securities held-to-maturity	4,047	4,046
Investment securities held-to-maturity	4,445	4,757
Other investments	6,001	5,592
Cash value of bank owned life insurance	33,431	32,794
Accrued interest receivable	4,316	4,120
Level 3 inputs:
Loans held-for-investment, net	1,156,456	1,075,745
Level 2 inputs:
Junior subordinated debentures					36,100
Level 3 inputs:
Time deposits	1,306,163	1,267,030	1,259,470
Reported Value Measurement [Member]
Level 2 inputs:
Cash and cash equivalents	126,568	159,449
Interest-bearing deposits in banks	15,501	15,321
Investment securities held-to-maturity	4,047	4,046
Other investments	6,001	5,592
Cash value of bank owned life insurance	33,431	32,794
Accrued interest receivable	4,316	4,120
Level 3 inputs:
Loans held-for-investment, net	1,156,456	1,075,745
Level 2 inputs:
Deposit transaction accounts	766,222	808,377
Junior subordinated debentures	36,083	36,083
Accrued interest payable	283	233
Level 3 inputs:
Time deposits	539,941	458,653
Other borrowings	46,000	25,000
Off-balance sheet financial instruments
Unfunded loan commitments, including unfunded lines of credit	0	0
Unfunded loan commitments, including unfunded lines of credit	0	0
Standby letters of credit	0	0
Standby letters of credit	0	0
Estimate of Fair Value Measurement [Member]
Level 2 inputs:
Cash and cash equivalents	126,568	159,449
Interest-bearing deposits in banks	15,501	15,321
Investment securities held-to-maturity	4,445	4,757
Other investments	6,001	5,592
Cash value of bank owned life insurance	33,431	32,794
Accrued interest receivable	4,316	4,120
Level 3 inputs:
Loans held-for-investment, net	1,142,858	1,062,432
Level 2 inputs:
Deposit transaction accounts	766,222	808,377
Junior subordinated debentures	36,083	36,083
Accrued interest payable	283	233
Level 3 inputs:
Time deposits	542,549	461,672
Other borrowings	47,699	25,008
Off-balance sheet financial instruments
Unfunded loan commitments, including unfunded lines of credit	247	251
Unfunded loan commitments, including unfunded lines of credit	247	251
Standby letters of credit	30	24
Standby letters of credit	$ 30	$ 24