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Fair value of financial instruments (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Total of allowance for loan losses $ 72,751,000 $ 72,976,000 $ 88,547,000 $ 78,615,000
Amortization of Deferred Charges, Total 6,700,000 7,100,000    
Available-For-Sale Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount $ 4,116,000