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ALLOWANCE FOR LOAN LOSSES: (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Allowance for Loan Losses:      
Beginning balance $ 19,241 $ 22,336 $ 19,437
Provision for loan losses 11,000 [1] 5,880 [2] 10,862 [3]
Loans charged off (10,414) (11,116) (12,474)
Recoveries 2,131 2,141 4,511
Ending Balance 21,958 19,241 22,336
Commercial
      
Allowance for Loan Losses:      
Beginning balance 12,119 12,809  
Provision for loan losses 2,400 [1] 3,708 [2]  
Loans charged off (4,176) (5,336)  
Recoveries 644 938  
Ending Balance 10,987 12,119  
Residential
      
Allowance for Loan Losses:      
Beginning balance 2,728 2,873  
Provision for loan losses 5,196 [1] 2,571 [2]  
Loans charged off (2,598) (2,811)  
Recoveries 100 95  
Ending Balance 5,426 2,728  
Consumer
      
Allowance for Loan Losses:      
Beginning balance 3,889 4,551  
Provision for loan losses 2,243 [1] 1,199 [2]  
Loans charged off (3,640) (2,969)  
Recoveries 1,387 1,108  
Ending Balance 3,879 3,889  
Unallocated
      
Allowance for Loan Losses:      
Beginning balance 505 2,103  
Provision for loan losses 1,161 [1] (1,598) [2]  
Loans charged off 0 0  
Recoveries 0 0  
Ending Balance $ 1,666 $ 505  
[1] Provision before decrease of $2.2 million in 2012 for increase in FDIC indemnification asset
[2] Provision before decrease of $125 thousand in 2011 for increase in FDIC indemnification asset
[3] In 2010 the provision charged to expense was reduced by $1.7 million for the increase to the FDIC Indemnification asset.