Note 11 - Fair Value (Details) - Carrying Value And Estimated Fair Values Of Financial Instruments (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012		Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2009
Level 2 inputs:
Cash and cash equivalents	$ 167,490		$ 159,449		$ 174,911	$ 193,609
Interest-bearing deposits in banks	15,616		15,321
Investment securities held-to-maturity	7,788		4,046
Investment securities held-to-maturity	8,108		4,757
Other investments	5,702		5,592
Cash value of bank owned life insurance	33,721		32,794
Accrued interest receivable	3,753		4,120
Level 3 inputs:
Loans held-for-investment, net (1)	1,164,024		1,075,745
Level 2 inputs:
Junior subordinated debentures							36,100
Level 3 inputs:
Time deposits	1,352,468		1,267,030		1,265,057
Reported Value Measurement [Member]
Level 2 inputs:
Cash and cash equivalents	167,490		159,449
Interest-bearing deposits in banks	15,616		15,321
Investment securities held-to-maturity	7,788		4,046
Other investments	5,702		5,592
Cash value of bank owned life insurance	33,721		32,794
Accrued interest receivable	3,753		4,120
Level 3 inputs:
Loans held-for-investment, net (1)	1,164,024	[1]	1,075,745	[1]
Level 2 inputs:
Deposit transaction accounts	798,693		808,377
Junior subordinated debentures	36,083		36,083
Accrued interest payable	280		233
Level 3 inputs:
Time deposits	553,775		458,653
Other borrowings	46,000		25,000
Off-balance sheet financial instruments
Unfunded loan commitments, including unfunded lines of credit	0		0
Standby letters of credit	0		0
Estimate of Fair Value Measurement [Member]
Level 2 inputs:
Cash and cash equivalents	167,490		159,449
Interest-bearing deposits in banks	15,616		15,321
Investment securities held-to-maturity	8,108		4,757
Other investments	5,702		5,592
Cash value of bank owned life insurance	33,721		32,794
Accrued interest receivable	3,753		4,120
Level 3 inputs:
Loans held-for-investment, net (1)	1,149,087	[1]	1,062,432	[1]
Level 2 inputs:
Deposit transaction accounts	798,693		808,377
Junior subordinated debentures	36,083		36,083
Accrued interest payable	280		233
Level 3 inputs:
Time deposits	556,408		461,672
Other borrowings	46,737		25,008
Off-balance sheet financial instruments
Unfunded loan commitments, including unfunded lines of credit	214		251
Standby letters of credit	$ 23		$ 24

[1] Includes loans held-for-sale.