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Investment Securities: (Details) (USD $)
In Thousands
9 Months Ended12 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]  
Available-for-sale Securities, Gross Unrealized Gains$ 0$ 0
Available-for-sale Securities, Gross Realized Gain (Loss)00
Debt Securities Maturity Date Range Low2011 
Debt Securities Maturity Date Range High2037 
Debt Securities Callable Period1Y 
Investment securities52,15314,507[1]
Federal tax-exempt debt securities [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Investment securities31,05111,687
Corporate Bond Securities [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Investment securities16,023 
Available-for-sale Securities 0
Certificates of deposit [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Investment securities$ 5,079$ 2,820
[1]December 31, 2010 balances were derived from audited consolidated financial statements.