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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 |  |

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