Note 7 - Loans (Detail) - Troubled Debt Restructurings Modified (USD $) In Thousands, unless otherwise specified			6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Commercial Loans Member Accruing Troubled Debt Restructuring Member	Dec. 31, 2011 Commercial Loans Member Accruing Troubled Debt Restructuring Member	Jun. 30, 2012 Commercial Mortgage Loans [Member] Accruing Troubled Debt Restructuring Member	Dec. 31, 2011 Commercial Mortgage Loans [Member] Accruing Troubled Debt Restructuring Member	Jun. 30, 2012 Residential Mortgage Loans [Member] Accruing Troubled Debt Restructuring Member	Dec. 31, 2011 Residential Mortgage Loans [Member] Accruing Troubled Debt Restructuring Member	Jun. 30, 2012 Total [Member] Accruing Troubled Debt Restructuring Member	Dec. 31, 2011 Total [Member] Accruing Troubled Debt Restructuring Member	Jun. 30, 2011 Accruing Troubled Debt Restructuring Member	Jun. 30, 2011 Accruing Troubled Debt Restructuring Member	Jun. 30, 2012 Accruing Troubled Debt Restructuring Member	Mar. 31, 2012 Accruing Troubled Debt Restructuring Member	Dec. 31, 2011 Accruing Troubled Debt Restructuring Member	Mar. 31, 2011 Accruing Troubled Debt Restructuring Member	Dec. 31, 2010 Accruing Troubled Debt Restructuring Member
No. of Loans			5	5	12	2	3	1	20	8
Pre-Modification Recorded Investment			$ 1,988	$ 15,124	$ 44,619	$ 1,929	$ 1,802	$ 501	$ 48,409	$ 17,554
Post-Modification Recorded Investment			1,988	15,124	40,940	1,929	1,802	501	44,730	17,554	116,328	116,328	153,249	143,233	120,016	135,327	136,800
Charge-Off			0	0	3,679	0	0	0	3,679	0	(659)	(659)
Specific Reserve	$ 7,242	$ 7,554	$ 60	$ 53	$ 0	$ 1	$ 14	$ 93	$ 74	$ 147