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Note 12 - Pension and Other Postretirement Benefit Plans (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 1995
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Defined Contribution Plan, Vesting Period 5 years      
In Event of Termination [Member] | Directors' Plan [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Full Time Employment Years of Service 2 years      
Defined Benefit Contributions, Months of Benefit Used In Lump Sum Payment 120 months      
In Event of Termination [Member] | Less Than [Member] | Directors' Plan [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Full Time Employment Years of Service 2 years      
U.S. large-cap growth [Member] | Savings Bank [Member] | Minimum [Member] | Retirement Plan [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Number of Stocks Held in Portfolio 55      
U.S. large-cap growth [Member] | Savings Bank [Member] | Maximum [Member] | Retirement Plan [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Number of Stocks Held in Portfolio 70      
U.S. Small-Cap Blend [Member] | Savings Bank [Member] | Retirement Plan [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Pension Plan Assets, Equity Securities Held in Mutual Funds, Minimum Market Capitalization (in Dollars) $ 100,000,000      
U.S. Small-Cap Blend [Member] | Savings Bank [Member] | Minimum [Member] | Retirement Plan [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Number of Stocks Held in Portfolio 40      
U.S. Small-Cap Blend [Member] | Savings Bank [Member] | Maximum [Member] | Retirement Plan [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Number of Stocks Held in Portfolio 100      
International blend [Member] | Savings Bank [Member] | Minimum [Member] | Retirement Plan [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Number of Stocks Held in Portfolio 80      
International blend [Member] | Savings Bank [Member] | Maximum [Member] | Retirement Plan [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Number of Stocks Held in Portfolio 90      
Equity Securities [Member] | Savings Bank [Member] | Retirement Plan [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Defined Benefit Plan, Target Plan Asset Allocations 60.00%      
Equity Securities [Member] | Savings Bank [Member] | Minimum [Member] | Retirement Plan [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 8.00%      
Equity Securities [Member] | Savings Bank [Member] | Maximum [Member] | Retirement Plan [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 10.00%      
Fixed Income Securities [Member] | Savings Bank [Member] | Retirement Plan [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Defined Benefit Plan, Target Plan Asset Allocations 40.00%      
Fixed Income Securities [Member] | Savings Bank [Member] | Minimum [Member] | Retirement Plan [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 3.00%      
Fixed Income Securities [Member] | Savings Bank [Member] | Maximum [Member] | Retirement Plan [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 5.00%      
Trust for Benefit of Employees [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Full Time Employment Years of Service 1 year      
Amount Borrowed From the Company by the Employee Benefit Trust (in Dollars)       7,900,000
Stock Issued During Period, Value, Employee Benefit Plan (in Dollars)       7,000
Stock Issued During Period, Shares, Employee Benefit Plan (in Shares)       2,328,750
Employer Contributions to the 401(k) and Profit Sharing Plans Funded By the Employee Benefit Trust (in Dollars) 2,300,000 2,100,000 2,000,000  
Savings Bank [Member] | 401(k) [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Defined Contribution Plan Annual Employer Matching Of Employee's Contribution Percent 50.00%      
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 3.00%      
Savings Bank [Member] | Defined Contribution Retirement Plan ("DCRP") [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 4.00%      
Savings Bank [Member] | Retirement Plan [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Defined Benefit Plan, Contributions by Employer (in Dollars) 800,000 700,000 2,700,000  
Defined Benefit Plan, Benefit Obligation (in Dollars) 19,700,000 22,500,000    
Savings Bank [Member] | Directors' Plan [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Defined Benefit Plan, Benefit Obligation (in Dollars) 2,700,000 2,700,000    
Annual Retirement Benefit Paid to Terminating Eligible Directors (in Dollars) 48,000      
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year (in Dollars) 260,000      
Savings Bank [Member] | Minimum [Member] | Retirement Plan [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 8.00%      
401(k) [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage 20.00%      
Defined Contribution Plan, Employers Matching Contribution, Vesting Percentage Upon Change of Control 100.00%      
Defined Contribution Plan, Cost Recognized (in Dollars) 2,900,000 2,400,000 2,300,000  
Non-Qualified Deferred Compensation Plan [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Defined Contribution Plan Annual Employer Matching Of Employee's Contribution Percent 50.00%      
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 5.00%      
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage 20.00%      
Defined Contribution Plan, Vesting Period 5 years      
Defined Contribution Plan, Employers Matching Contribution, Vesting Percentage Upon Change of Control 100.00%      
Defined Contribution Plan, Cost Recognized (in Dollars) 400,000 400,000 300,000  
Retirement Plan [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Defined Benefit Plan, Contributions by Employer (in Dollars) 831,000 723,000    
Defined Benefit Plan, Benefit Obligation (in Dollars) 19,740,000 22,531,000 21,101,000  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 7.50% 7.50% 8.00%  
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months (in Dollars) 158,000      
Postretirement Plans [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Defined Benefit Plan, Contributions by Employer (in Dollars) 66,000 67,000    
Defined Benefit Plan, Benefit Obligation (in Dollars) 5,586,000 5,927,000 5,166,000  
Number of Unfunded Postretirement Benefit Plans 2      
Full Time Employment Years of Service 5 years      
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months (in Dollars) 1,030,000 158,000    
Postretirement Plan 1 [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Cost Sharing Arrangement, Medical Benefits, Percentage 50.00%      
Medical Premiums, Required Percentage to Be Paid By Spouses of Future Retirees 100.00%      
401(k) [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Defined Contribution Plan Service Period Requirement 1 year      
Directors' Plan [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Defined Benefit Plan, Contributions by Employer (in Dollars) 98,000 87,000    
Defined Benefit Plan, Benefit Obligation (in Dollars) 2,666,000 2,706,000 2,647,000  
Full Time Employment Years of Service 5 years      
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months (in Dollars) $ 260,000      
Minimum [Member] | Retirement Plan [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Defined Benefit Plan, Benefit Service Period 3 years      
Maximum [Member] | Retirement Plan [Member]
        
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]        
Defined Benefit Plan, Benefit Service Period 10 years