Note 4 - Loans and Allowance for Credit Losses (Details) - Credit Risk Profile by Internally Assigned Grade (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Grade:
Loans by grade	$ 1,732,382		$ 1,827,744
Commercial [Member] | Pass [Member]
Grade:
Loans by grade	363,911		329,667
Commercial [Member] | Substandard [Member]
Grade:
Loans by grade	6,136		8,142
Commercial [Member] | Doubtful [Member]
Grade:
Loans by grade	13		1,015
Commercial [Member]
Grade:
Loans by grade	370,060		338,824
Commercial Real Estate Loans [Member] | Pass [Member]
Grade:
Loans by grade	530,115		554,991
Commercial Real Estate Loans [Member] | Substandard [Member]
Grade:
Loans by grade	43,064		41,662
Commercial Real Estate Loans [Member]
Grade:
Loans by grade	573,179		596,653
Construction [Member] | Pass [Member]
Grade:
Loans by grade	9,824		10,274
Construction [Member] | Substandard [Member]
Grade:
Loans by grade			449
Construction [Member]
Grade:
Loans by grade	9,824		10,723
Residential Real Estate Loans [Member] | Pass [Member]
Grade:
Loans by grade	154,759		174,113
Residential Real Estate Loans [Member] | Substandard [Member]
Grade:
Loans by grade	2,035		2,083
Residential Real Estate Loans [Member]
Grade:
Loans by grade	156,794		176,196
Consumer Installment And Other [Member] | Pass [Member]
Grade:
Loans by grade	378,677		399,377
Consumer Installment And Other [Member] | Substandard [Member]
Grade:
Loans by grade	680		1,127
Consumer Installment And Other [Member] | Doubtful [Member]
Grade:
Loans by grade	13		19
Consumer Installment And Other [Member] | Unlikely to be Collected Financing Receivable [Member]
Grade:
Loans by grade	338		365
Consumer Installment And Other [Member]
Grade:
Loans by grade	379,708		400,888
Purchased Non-Covered Loans [Member] | Pass [Member]
Grade:
Loans by grade	194,451		41,490
Purchased Non-Covered Loans [Member] | Substandard [Member]
Grade:
Loans by grade	40,717		14,587
Purchased Non-Covered Loans [Member] | Doubtful [Member]
Grade:
Loans by grade	337		958
Purchased Non-Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Grade:
Loans by grade	22
Purchased Non-Covered Loans [Member] | Default Risk Purchase Discount [Member]
Grade:
Loans by grade	(10,233)		(3,245)
Purchased Non-Covered Loans [Member]
Grade:
Loans by grade	225,294		53,790
Purchased Covered Loans [Member] | Pass [Member]
Grade:
Loans by grade	15,953	[1]	196,882	[1]
Purchased Covered Loans [Member] | Substandard [Member]
Grade:
Loans by grade	2,071	[1]	64,624	[1]
Purchased Covered Loans [Member] | Doubtful [Member]
Grade:
Loans by grade		[1]	97	[1]
Purchased Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Grade:
Loans by grade		[1]		[1]
Purchased Covered Loans [Member] | Default Risk Purchase Discount [Member]
Grade:
Loans by grade	(501)	[1]	(10,933)	[1]
Purchased Covered Loans [Member]
Grade:
Loans by grade	17,523	[1]	250,670	[1]
Pass [Member]
Grade:
Loans by grade	1,647,690		1,706,794
Substandard [Member]
Grade:
Loans by grade	94,703		132,674
Doubtful [Member]
Grade:
Loans by grade	363		2,089
Unlikely to be Collected Financing Receivable [Member]
Grade:
Loans by grade	360		365
Default Risk Purchase Discount [Member]
Grade:
Loans by grade	$ (10,734)		$ (14,178)

[1] Credit risk profile reflects internally assigned grade of purchased covered loans without regard to FDIC indemnification.