Note 7 - Loans (Detail) - Allowance for Loan Losses by Portfolio Segment (USD $) In Thousands, unless otherwise specified	6 Months Ended		3 Months Ended		5 Months Ended	6 Months Ended		3 Months Ended		5 Months Ended	6 Months Ended		3 Months Ended		5 Months Ended	6 Months Ended		3 Months Ended		5 Months Ended	6 Months Ended		3 Months Ended		5 Months Ended			3 Months Ended		5 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Commercial Loans Member	Jun. 30, 2011 Commercial Loans Member	Jun. 30, 2012 Commercial Loans Member	Jun. 30, 2011 Commercial Loans Member	Dec. 31, 2011 Commercial Loans Member	Jun. 30, 2012 Real Estate Construction Loans [Member]	Jun. 30, 2011 Real Estate Construction Loans [Member]	Jun. 30, 2012 Real Estate Construction Loans [Member]	Jun. 30, 2011 Real Estate Construction Loans [Member]	Dec. 31, 2011 Real Estate Construction Loans [Member]	Jun. 30, 2012 Commercial Mortgage Loans [Member]	Jun. 30, 2011 Commercial Mortgage Loans [Member]	Jun. 30, 2012 Commercial Mortgage Loans [Member]	Jun. 30, 2011 Commercial Mortgage Loans [Member]	Dec. 31, 2011 Commercial Mortgage Loans [Member]	Jun. 30, 2012 Residential Mortgage And Equity Lines Member	Jun. 30, 2011 Residential Mortgage And Equity Lines Member	Jun. 30, 2012 Residential Mortgage And Equity Lines Member	Jun. 30, 2011 Residential Mortgage And Equity Lines Member	Dec. 31, 2011 Residential Mortgage And Equity Lines Member	Jun. 30, 2012 Installment And Other Loans Member	Jun. 30, 2011 Installment And Other Loans Member	Jun. 30, 2012 Installment And Other Loans Member	Dec. 31, 2011 Installment And Other Loans Member	Dec. 31, 2010 Installment And Other Loans Member	Jun. 30, 2012 Total [Member]	Jun. 30, 2011 Total [Member]	Jun. 30, 2012 Total [Member]	Jun. 30, 2011 Total [Member]	Dec. 31, 2011 Total [Member]
Ending Balance			$ 66,595	$ 65,860	$ 66,595	$ 65,860	$ 65,658	$ 16,360	$ 37,683	$ 16,360	$ 37,683	$ 21,749	$ 99,009	$ 117,014	$ 99,009	$ 117,014	$ 108,021	$ 10,254	$ 9,307	$ 10,254	$ 9,307	$ 10,795	$ 56	$ 36	$ 56	$ 57	$ 36	$ 192,274	$ 229,900	$ 192,274	$ 229,900	$ 206,280
Reserve for impaired loans			3,687	2,482	3,687	2,482		0	7,140	0	7,140		1,896	3,481	1,896	3,481		1,659	1,161	1,659	1,161		0		0			7,242	14,264	7,242	14,264
Reserve for non-impaired loans			62,908	63,378	62,908	63,378		16,360	30,543	16,360	30,543		97,113	113,533	97,113	113,533		8,595	8,146	8,595	8,146		56	36	56			185,032	215,636	185,032	215,636
Reserve for off-balance sheet credit commitments			747	564	747	564		617	863	617	863		104	82	104	82		35	35	35	35		2	3	2			1,505	1,547	1,505	1,547
Beginning Balance			60,404	63,194		63,919	65,658	17,992	42,554		43,261	21,749	106,175	125,295		128,347	108,021	10,122	9,949		9,668	10,795	50	38		57	36	194,743	241,030		245,231	206,280
Provision for possible credit losses	7,487	4,315	8,171	11,004	7,130	10,882		(2,972)	(3,265)	(9,411)	1,389		(10,906)	3,532	(6,587)	4,880		671	(642)	410	(361)		6	(2)	21			(5,030)	10,627	(8,437)	16,790
Charge-offs			(2,133)	(8,618)	(7,092)	(9,996)		(251)	(4,607)	(1,126)	(10,855)		(1,458)	(13,696)	(9,681)	(19,045)		(550)		(1,328)					(25)			(4,392)	(26,921)	(19,252)	(39,896)
Recoveries			153	280	899	1,055		1,591	3,001	5,148	3,888		5,198	1,883	7,256	2,832		11		377					3			6,953	5,164	13,683	7,775
Net charge-offs			$ (1,980)	$ (8,338)	$ (6,193)	$ (8,941)		$ 1,340	$ (1,606)	$ 4,022	$ (6,967)		$ 3,740	$ (11,813)	$ (2,425)	$ (16,213)		$ (539)		$ (951)					$ (22)			$ 2,561	$ (21,757)	$ (5,569)	$ (32,121)