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	Jun. 30, 2012	Dec. 31, 2011
Ending loan balance	$ 1,040,439	$ 1,072,108
Real Estate Loans [Member]
Individually evaluated for impairment	4,497	1,737
Collectively evaluated for impairment	19,724	21,801
Total ending allowance balance	24,221	23,538
Loans individually evaluated for impairment	92,043	134,800
Loans collectively evaluated for impairment	835,851	814,984
Ending loan balance	927,894	949,784
Commercial Portfolio Segment [Member]
Individually evaluated for impairment	233	159
Collectively evaluated for impairment	1,904	3,349
Total ending allowance balance	2,137	3,508
Loans individually evaluated for impairment	250	3,438
Loans collectively evaluated for impairment	93,299	97,521
Ending loan balance	93,549	100,959
Consumer Portfolio Segment [Member]
Individually evaluated for impairment	117	30
Collectively evaluated for impairment	638	1,188
Total ending allowance balance	755	1,218
Loans individually evaluated for impairment	251	79
Loans collectively evaluated for impairment	18,745	21,286
Ending loan balance	18,996	21,365
Total [Member]
Individually evaluated for impairment	4,847	1,926
Collectively evaluated for impairment	22,266	26,338
Total ending allowance balance	27,113	28,264
Loans individually evaluated for impairment	92,544	138,317
Loans collectively evaluated for impairment	947,895	933,791
Ending loan balance	$ 1,040,439	$ 1,072,108