Annual report pursuant to Section 13 and 15(d)

Bank Premises and Equipment (Details Textual)

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Bank Premises and Equipment (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Bank Premises and Equipment (Textual) [Abstract]      
Depreciation expense $ 6,631,000 $ 6,715,000 $ 6,502,000
Extend periods for leases 20 years    
Rental expense $ 5,900,000 $ 4,900,000 $ 5,200,000