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Repurchase Agreements - Maturities (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Assets Sold under Agreements to Repurchase [Line Items]    
Fair Value of securities pledged, including accrued interest receivable $ 113,649,000 $ 73,305,000
Repurchase agreements, net 107,121,103 69,528,000
Net weighted average borrowing rate 0.43% 0.43%
[MaturityOvernightMember]
   
Assets Sold under Agreements to Repurchase [Line Items]    
Fair Value of securities pledged, including accrued interest receivable 0 0
Repurchase agreements, net 0 0
Net weighted average borrowing rate 0.00% 0.00%
[MaturityUpTo30DaysMember]
   
Assets Sold under Agreements to Repurchase [Line Items]    
Fair Value of securities pledged, including accrued interest receivable 113,649,000 73,305,000
Repurchase agreements, net 107,121,000 69,528,000
Net weighted average borrowing rate 0.43% 0.43%
[Maturity30To90DaysMember]
   
Assets Sold under Agreements to Repurchase [Line Items]    
Fair Value of securities pledged, including accrued interest receivable 0 0
Repurchase agreements, net 0 0
Net weighted average borrowing rate 0.00% 0.00%
[MaturityOver90DaysMember]
   
Assets Sold under Agreements to Repurchase [Line Items]    
Fair Value of securities pledged, including accrued interest receivable 0 0
Repurchase agreements, net $ 0 $ 0
Net weighted average borrowing rate 0.00% 0.00%