Note 8 - 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	Mar. 31, 2013	Dec. 31, 2012
Ending loan balance	$ 1,017,977	$ 1,004,995
Real Estate Loans [Member]
Individually evaluated for impairment	4,379	4,732
Collectively evaluated for impairment	17,023	17,522
Total ending allowance balance	21,402	22,254
Loans individually evaluated for impairment	62,848	63,351
Loans collectively evaluated for impairment	847,387	833,342
Ending loan balance	910,235	896,693
Commercial Portfolio Segment [Member]
Individually evaluated for impairment	245	198
Collectively evaluated for impairment	1,313	1,315
Total ending allowance balance	1,558	1,513
Loans individually evaluated for impairment	668	207
Loans collectively evaluated for impairment	90,029	89,848
Ending loan balance	90,697	90,055
Consumer Portfolio Segment [Member]
Individually evaluated for impairment	117	213
Collectively evaluated for impairment	486	465
Total ending allowance balance	603	678
Loans individually evaluated for impairment	234	331
Loans collectively evaluated for impairment	16,811	17,916
Ending loan balance	17,045	18,247
Total [Member]
Individually evaluated for impairment	4,741	5,143
Collectively evaluated for impairment	18,822	19,302
Total ending allowance balance	23,563	24,445
Loans individually evaluated for impairment	63,750	63,889
Loans collectively evaluated for impairment	954,227	941,106
Ending loan balance	$ 1,017,977	$ 1,004,995