Note 7 - Loans and Allowance for Loan Losses (Detail) - Allowance For Loan Losses And The Recorded Investment In Loans By Portfolio Segment (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Ending loan balance	$ 1,018,311	$ 1,072,108
Real Estate Loans [Member]
Individually evaluated for impairment	3,734	1,737
Collectively evaluated for impairment	17,707	21,801
Total ending allowance balance	21,441	23,538
Loans individually evaluated for impairment	78,619	134,800
Loans collectively evaluated for impairment	827,685	814,984
Ending loan balance	906,304	949,784
Commercial Portfolio Segment [Member]
Individually evaluated for impairment	244	159
Collectively evaluated for impairment	2,456	3,349
Total ending allowance balance	2,700	3,508
Loans individually evaluated for impairment	250	3,438
Loans collectively evaluated for impairment	93,072	97,521
Ending loan balance	93,322	100,959
Consumer Portfolio Segment [Member]
Individually evaluated for impairment	180	30
Collectively evaluated for impairment	823	1,188
Total ending allowance balance	1,003	1,218
Loans individually evaluated for impairment	299	79
Loans collectively evaluated for impairment	18,386	21,286
Ending loan balance	18,685	21,365
Total [Member]
Individually evaluated for impairment	4,158	1,926
Collectively evaluated for impairment	20,986	26,338
Total ending allowance balance	25,144	28,264
Loans individually evaluated for impairment	79,168	138,317
Loans collectively evaluated for impairment	939,143	933,791
Ending loan balance	$ 1,018,311	$ 1,072,108