Note 1 - Summary of Significant Accounting Policies (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2014	Dec. 31, 2013
Number of Limited Partnerships in Housing Investments	6
Percentage Of Subsidiaries Common Securities Owned By Parent Company	100.00%
Gross Loans Comprised Of Commercial Mortgage Loans Percentage	50.70%
Gross Loans Comprised Of Commercial Loans Percentage	28.60%
Total Deposits Comprised Of Time Deposit Percentage	43.60%
Jumbo Cds Deposit With Company For Two Years Or More Percentage	67.40%
Federal Home Loan Bank Stock (in Dollars)	$ 41,272,000	$ 52,989,000
Minimum Stock Requirement On Outstanding Federal Home Loan Bank Borrowings Shares (in Shares)	68,714
Advances from Federal Home Loan Banks (in Dollars)	146,200,000	225,000,000
Company Owned Shares Of FHLB stock (in Shares)	412,716
Maximum Loan Size Portfolio Stratification Homogenous Portfolio (in Dollars)	500,000
Venture Capital Investments Limited Partnership Interests Represent Ownership Maximum Percentage	5.00%
Unamortized Core Deposit Premium (in Dollars)	4,900,000	10,600,000
Core Deposit Premium Accumulated Amortization (in Dollars)	55,300,000	49,800,000
Amortization of Intangible Assets (in Dollars)	5,663,000	5,859,000	5,958,000
Future Amortization Expense After Year Three (in Dollars)				400,000	4,500,000
Stock or Unit Option Plan Expense (in Dollars)	762,000	1,000,000	3,000,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars)	129,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	2 months
California [Member]
Residential Mortgages Properties Percentage	63.00%
Core Deposits [Member]
Amortization of Intangible Assets (in Dollars)	$ 5,700,000	$ 5,900,000	$ 6,000,000