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Fair Value of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Cash and cash equivalents, Carrying Amount $ 219,806 $ 235,962 $ 334,783 $ 138,929
Investment securities, Carrying Amount 367,519 310,612    
Loans, net, Carrying Amount 668,853 658,611    
Accrued interest receivable, Carrying Amount 6,168 6,125    
Assets, Carrying Amount 1,262,346 1,211,310    
Cash and cash equivalents, Fair Value 219,806 235,962    
Investment securities, Fair Value 367,519 310,612    
Loans, net, Fair Value 671,757 665,348    
Accrued interest receivable, Fair Value 6,168 6,125    
Assets, Fair Value 1,265,250 1,218,047    
Deposits, Carrying Amount 548,334 548,368    
Accounts and drafts payable, Carrying Amount 648,944 595,201    
Accrued interest payable, Carrying Amount 142 159    
Liabilities, Carrying Amount 1,197,420 1,143,728    
Deposits, Fair Value 548,837 548,985    
Accounts and drafts payable, Fair Value 648,944 595,201    
Accrued interest payable, Fair Value 142 159    
Liabilities, Fair Value $ 1,197,923 $ 1,144,345