Note 5 - Loans (Detail) (USD $)	1 Months Ended		12 Months Ended												12 Months Ended				12 Months Ended										12 Months Ended																		12 Months Ended
	Mar. 31, 2012	Jul. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Loans Sold [Member]	Dec. 31, 2012 Held For Sale [Member]	Dec. 31, 2011 New Loan [Member]	Dec. 31, 2012 Nonaccrual Loans [Member]	Dec. 31, 2011 Nonaccrual Loans [Member]	Dec. 31, 2010 Nonaccrual Loans [Member]	Dec. 31, 2012 Accruing Troubled Debt Restructuring Member	Dec. 31, 2011 Accruing Troubled Debt Restructuring Member	Dec. 31, 2011 Nonaccrual Loans Held For Sale [Member]	Dec. 31, 2012 Commercial Real Estate Other Receivable [Member]	Dec. 31, 2012 Land Loan Member	Dec. 31, 2012 Residential Mortgage Loans [Member] Accruing Troubled Debt Restructuring Member	Dec. 31, 2011 Residential Mortgage Loans [Member] Accruing Troubled Debt Restructuring Member	Dec. 31, 2012 Residential Mortgage Loans [Member]	Dec. 31, 2011 Commercial Construction Loans [Member]	Dec. 31, 2012 Residential Mortgage Loans [Member]	Dec. 31, 2011 Residential Mortgage Loans [Member]	Dec. 31, 2012 Real Estate Loans [Member]	Dec. 31, 2011 Real Estate Loans [Member]	Dec. 31, 2012 Commercial Loans Member	Dec. 31, 2011 Commercial Loans Member	Dec. 31, 2012 Commercial Real Estate Loans [Member]	Dec. 31, 2012 Construction [Member]	Dec. 31, 2012 Accruing Troubled Debt Restructuring Member	Dec. 31, 2011 Accruing Troubled Debt Restructuring Member	Dec. 31, 2012 Non Accruing Troubled Debt Restructuring Member	Dec. 31, 2011 Non Accruing Troubled Debt Restructuring Member	Dec. 31, 2012 Retail Shopping And Commercial Use Building Member	Dec. 31, 2011 Retail Shopping And Commercial Use Building Member	Dec. 31, 2012 Office And Commercial Use Building Member	Dec. 31, 2011 Office And Commercial Use Building Member	Dec. 31, 2012 Hotel Loan Member	Dec. 31, 2011 Hotel Loan Member	Dec. 31, 2012 Single Family Residential Loan Member	Sep. 30, 2012 Single Family Residential Loan Member	Dec. 31, 2011 Single Family Residential Loan Member	Sep. 30, 2012 Land Loan Member	Dec. 31, 2011 Land Loan Member	Sep. 30, 2012 Commercial Loans Member	Dec. 31, 2011 Commercial Loans Member	Sep. 30, 2012 Multi-Family Residences [Member]	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2012 Maximum [Member]
Loans Receivable Held-for-sale, Amount			$ 0	$ 760,000	$ 2,900,000															$ 500,000		$ 260,000
Transfer of Portfolio Loans and Leases to Held-for-sale			15,986,000	4,399,000	4,332,000
Increase (Decrease) in Loans Held-for-sale				3,600,000		16,200,000		4,400,000
Gain (Loss) on Sale of Loans and Leases				88,000			26,000
Transfer of Loans Held-for-sale to Portfolio Loans			500,000
Decrease In Loans Held For Sale				2,100,000
Transfer to Other Real Estate				2,874,000	21,473,000
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged																							1,600,000,000	2,000,000,000
Loans Pledged with Federal Reserve Bank																									211,600,000	250,900,000
Servicing Asset at Fair Value, Amount			201,400,000																		93,500,000				42,100,000		62,200,000	3,600,000
Mortgage Loans on Real Estate, Cost of Mortgages Sold	7,900,000	24,500,000
Percentage of Loan Participation to Contractual Balance	92.50%	98.00%
Impaired Financing Receivable, Recorded Investment			248,597,000	321,973,000					103,900,000	201,200,000		144,700,000	120,000,000	760,000																				74,400,000
Impaired Financing Receivable, Average Recorded Investment			277,776,000	361,353,000
Impaired Financing Receivable, Interest Income, Accrual Method			9,305,000	5,330,000					6,621,000	13,049,000	17,304,000
Percentage Of Charge-Off To Contractual Balances For Impaired Loans			23.20%	25.60%
Troubled Debt Restructurings, Total																													144,700,000	120,000,000	47,700,000	50,900,000	68,100,000		40,400,000		12,400,000			19,100,000		2,300,000		1,300,000
Impaired Financing Receivable, Modifications, Related Allowance																													1,100,000	1,400,000	7,800,000	1,600,000
Financing Receivable, Modifications, Number of Contracts			61	32													14	3															16	11	15	7	2	1	17		10	2	1	6	2	3
undefined			24,700,000																										53,958,000	60,863,000	12,304,000	13,269,000
Financing Receivable, Modifications, Recorded Investment			144,695,000	120,016,000																	4,716,000	3,368,000			3,964,000	15,120,000										23,800,000		7,900,000			13,300,000		635,000		39,000	1,100,000
Period Loan Is In Payment Default																																															60	90
Financing Receivable Modification Number Of Contracts Defaulted Within 12 Months															2	4			2
Financing Receivable Modifications Recorded Investment Defaulted Within 12 Months															26,300,000	12,200,000			1,600,000
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down			$ 46,000														$ 82,000												$ (251,000)	$ (2,341,000)	$ (4,182,000)	$ (7,303,000)