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BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES: (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Transfer to Other Real Estate $ 7,100,000 $ 3,500,000 $ 4,500,000
Servicing Fees, Net 1,300,000 1,200,000 1,200,000
Officers' Compensation 1,300,000 972,000 2,200,000
Deferred Compensation Liability, Current 2,600,000 2,600,000  
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures 583,700,000    
Income Tax Examination, Description The amount recognized is the largest amount of tax benefit that is greater than 50% likely of being realized on examination.    
Income Tax Examination, Likelihood of Unfavorable Settlement 50 percent    
Fair Value Of Indemnification Assets Reimbursement From Fdic 12,100,000    
Fdic Reimburse 95.00%    
Expenses For Deferred Compensation 142,000 144,000 183,000
Payment Of Incentive Rewards 15 years    
Compensation Liability 15,000,000 15,400,000  
Repayment Of Deferred Fees and Interest In Years 10 years    
Deferred Compensation Liablity Incentive Plan 1,600,000 2,200,000  
Minimum [Member]
      
Finite-Lived Intangible Asset, Useful Life 10 years    
Maximum [Member]
      
Finite-Lived Intangible Asset, Useful Life 12 years    
Long-Term Debt [Member]
      
Vesting period 3 years    
Furniture and Fixtures [Member] | Minimum [Member]
      
Property, Plant and Equipment, Estimated Useful Lives 3 years    
Furniture and Fixtures [Member] | Maximum [Member]
      
Property, Plant and Equipment, Estimated Useful Lives 33 years    
Buildings And Leasehold Improvements [Member] | Minimum [Member]
      
Property, Plant and Equipment, Estimated Useful Lives 5 years    
Buildings And Leasehold Improvements [Member] | Maximum [Member]
      
Property, Plant and Equipment, Estimated Useful Lives 39 years    
Fdic Premium Expense [Member]
      
Increases in the FDIC indemnification asset $ 2,200,000 $ 125,000 $ 1,700,000