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Investment Securities: (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Sep. 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 2040  
Investment securities $ 72,815 $ 79,259 [1]
Federal tax-exempt debt securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Investment securities 21,653 23,732
Corporate Bond Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Investment securities 47,582 47,037
Certificates of deposit [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Investment securities $ 3,580 $ 8,490
[1] December 31, 2012 balances were derived from audited consolidated financial statements.