Annual report pursuant to Section 13 and 15(d)

Deposits (Details Textual)

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Deposits (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Deposits (Textual) [Abstract]    
Time deposits held in Certificates of Deposit $ 1,032,740,000  
Deposits (Additional Textual) [Abstract]    
Time deposits in denominations of $100,000 or more 508,630,000 551,555,000
Deposit overdrafts as other consumer loans 5,700,000 1,300,000
Certificates of deposit account registry service accounts [Member]
   
Deposits (Textual) [Abstract]    
Time deposits held in Certificates of Deposit $ 36,700,000 $ 39,900,000
Maturity of deposits held in COD 1 year