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Investment Securities: (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Debt Securities Maturity Date Range Low 2012  
Debt Securities Maturity Date Range High 2043  
Investment securities $ 76,768 $ 60,395 [1]
Federal tax-exempt debt securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Investment securities 29,564 39,745
Corporate Bond Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Investment securities 39,267 13,263
Sovereign Debt [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Investment securities 647 1,928
Certificates of deposit [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Investment securities $ 7,290 $ 5,459
[1] December 31, 2011 balances were derived from audited consolidated financial statements.