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Investment Securities: (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Sep. 30, 2012
Jun. 30, 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   $ 73,395 $ 79,259 [1]
Federal tax-exempt debt securities [Member]
     
Schedule of Available-for-sale Securities [Line Items]      
Investment securities   23,956 23,732
Corporate Bond Securities [Member]
     
Schedule of Available-for-sale Securities [Line Items]      
Investment securities   43,727 47,037
Sovereign Debt [Member]
     
Schedule of Available-for-sale Securities [Line Items]      
Investment securities   652 0
Certificates of deposit [Member]
     
Schedule of Available-for-sale Securities [Line Items]      
Investment securities   $ 5,060 $ 8,490
[1] December 31, 2012 balances were derived from audited consolidated financial statements.