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Investment Securities: (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Gross Unrealized Gains $ 0 $ 0
Available-for-sale Securities, Gross Realized Gain (Loss) 0 0
Debt Securities Maturity Date Range Low 2011  
Debt Securities Maturity Date Range High 2037  
Debt Securities Callable Period 1Y  
Investment securities 33,444 14,507 [1]
Federal tax-exempt debt securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Investment securities 30,284 11,687
Certificates of deposit [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Investment securities $ 3,160 $ 2,820
[1] December 31, 2010 balances were derived from audited consolidated financial statements.