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FAIR VALUES OF FINANCIAL INSTRUMENTS: (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Reconciliation and income statement classification of gains and losses for all assets measured at fair value on a recurring basis using significant unobservable inputs    
Beginning balance $ 16,007 $ 3,708
Total realized/unrealized gains or losses - Included in earnings (542) 0
Total realized/unrealized gains or losses - Included in other comprehensive income 1,556 2,774
Settlements (2,174) (147)
Ending balance 16,033 16,007
Transfers & Purchases 1,186 9,672
Equity Securities
    
Reconciliation and income statement classification of gains and losses for all assets measured at fair value on a recurring basis using significant unobservable inputs    
Beginning balance 1,711 1,518
Total realized/unrealized gains or losses - Included in earnings (446) 0
Total realized/unrealized gains or losses - Included in other comprehensive income 0 193
Settlements (1,265) 0
Ending balance 0 1,711
State and Municipal Obligations
    
Reconciliation and income statement classification of gains and losses for all assets measured at fair value on a recurring basis using significant unobservable inputs    
Beginning balance 9,525  
Settlements (800) (147)
Ending balance 9,911 9,525
Transfers & Purchases 1,186 9,672
Collateralized Debt Obligations
    
Reconciliation and income statement classification of gains and losses for all assets measured at fair value on a recurring basis using significant unobservable inputs    
Beginning balance 4,771 2,190
Total realized/unrealized gains or losses - Included in earnings (96)  
Total realized/unrealized gains or losses - Included in other comprehensive income 1,556 2,581
Settlements (109) 0
Ending balance $ 6,122 $ 4,771