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Investment Securities: (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Debt Securities Maturity Date Range Low 2013  
Debt Securities Maturity Date Range High 2042  
Investment securities $ 78,929 $ 79,259 [1]
Federal tax-exempt debt securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Investment securities 23,577 23,732
Corporate Bond Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Investment securities 46,445 47,037
Sovereign Debt [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Investment securities 647 0
Certificates of deposit [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Investment securities $ 8,260 $ 8,490
[1] December 31, 2012 balances were derived from audited consolidated financial statements.