Quarterly report pursuant to Section 13 or 15(d)

Loans and Allowance for Loan Losses (Details Textual)

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Loans and Allowance for Loan Losses (Details Textual) (USD $)
6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Jun. 30, 2012
Nonaccrual Loans [Member]
Jun. 30, 2011
Nonaccrual Loans [Member]
Jun. 30, 2012
Impaired loans [Member]
Dec. 31, 2011
Impaired loans [Member]
Loans and Allowance for Loan Losses (Textual) [Abstract]              
Loans $ 2,887,790,000 $ 2,818,583,000 $ 2,859,569,000 $ 39,200,000 $ 54,300,000 $ 201,300,000 $ 255,100,000
Total accruing interest 10,768,000 19,912,000   10,800,000 9,100,000    
Individually evaluated for impairment           189,400,000 242,800,000
Collectively evaluated for impairment 2,698,391,000 2,575,750,000       11,900,000 12,300,000
TDR Recorded investment           80,200,000 112,600,000
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]              
Commercial real estate (owner occupied) loan, total 902,000            
Indirect marine loan total 26,000            
Troubled Debt Restructurings that Subsequently Defaulted 928,000            
Contractually required payments 1,080,780            
Cash flows expected to be collected 1,072,726            
Fair value of loans acquired as on date of acquisition $ 1,052,358