Note 7 - Loans (Detail) - Schedule of Impaired Loans and Related Allowance For Credit Losses (USD $)	Mar. 31, 2012	Dec. 31, 2011
With no allocated allowance
Recorded Investment	$ 275,200,000	$ 322,000,000
Total [Member]
With no allocated allowance
Unpaid Principal Balance	354,819,000	432,972,000
Recorded Investment	275,230,000	321,973,000
Allowance	5,607,000	7,552,000
Commercial Loans Member
With no allocated allowance
Unpaid Principal Balance	38,012,000	46,671,000
Recorded Investment	28,077,000	38,194,000
Real Estate Construction Loans [Member]
With no allocated allowance
Unpaid Principal Balance	65,839,000	134,836,000
Recorded Investment	43,426,000	78,767,000
Commercial Mortgage Loans [Member]
With no allocated allowance
Unpaid Principal Balance	174,252,000	187,580,000
Recorded Investment	134,562,000	149,034,000
Residential Mortgage And Equity Lines Member
With no allocated allowance
Unpaid Principal Balance	4,347,000	8,555,000
Recorded Investment	4,273,000	7,987,000
With No Allocated Allowance Member
With no allocated allowance
Unpaid Principal Balance	282,450,000	377,642,000
Recorded Investment	210,338,000	273,982,000
Commercial Loans Member
With no allocated allowance
Unpaid Principal Balance	20,689,000	11,795,000
Recorded Investment	17,329,000	7,587,000
Allowance	1,272,000	3,336,000
Commercial Mortgage Loans [Member]
With no allocated allowance
Unpaid Principal Balance	36,200,000	29,722,000
Recorded Investment	34,191,000	28,023,000
Allowance	2,529,000	2,969,000
Residential Mortgage And Equity Lines Member
With no allocated allowance
Unpaid Principal Balance	15,480,000	13,813,000
Recorded Investment	13,372,000	12,381,000
Allowance	1,806,000	1,247,000
With Allocated Allowance Member
With no allocated allowance
Unpaid Principal Balance	72,369,000	55,330,000
Recorded Investment	64,892,000	47,991,000
Allowance	$ 5,607,000	$ 7,552,000