Note 4 - Loans and Allowance for Loan Losses (Detail) - Recorded Investment in Loans (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Loans individually evaluated for impairment	$ 33,954	$ 40,108
Loans collectively evaluated for impairment	1,580,782	1,539,661
Balance, end of period	1,614,736	1,579,769
Commercial Loans [Member]
Loans individually evaluated for impairment	921	1,317
Loans collectively evaluated for impairment	262,192	225,833
Balance, end of period	263,113	227,150
Real Estate Loans [Member]
Loans individually evaluated for impairment	31,264	36,855
Loans collectively evaluated for impairment	992,367	964,436
Balance, end of period	1,023,631	1,001,291
Credit Cards [Member]
Loans individually evaluated for impairment	530	605
Loans collectively evaluated for impairment	175,795	189,365
Balance, end of period	176,325	189,970
Other Consumer and Other Loans [Member]
Loans individually evaluated for impairment	1,239	1,331
Loans collectively evaluated for impairment	150,428	160,027
Balance, end of period	$ 151,667	$ 161,358