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Deposits (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Interest expense on deposits [Abstract]      
Transaction deposits $ 14,300,000 $ 23,415,000 $ 38,886,000
Savings 540,000 719,000 719,000
Time Deposit, Interest Expense [Abstract]      
Certificates of deposits under $100,000 19,150,000 26,476,000 31,210,000
Certificates of deposits $100,000 and over 16,331,000 21,175,000 19,235,000
Other time deposits 16,692,000 17,105,000 16,215,000
Total time Deposit - Interest Expense 52,173,000 64,756,000 66,660,000
Total Interest Expense on Deposits 67,013,000 88,890,000 106,265,000
Time Deposits [Abstract]      
Time Deposits, $100,000 or More, Domestic 1,900,000,000 2,100,000,000  
Time Deposit Maturities [Abstract]      
2013 1,500,000,000    
2014 305,000,000    
2015 259,000,000    
2016 322,000,000    
2017 173,000,000    
Thereafter 406,000,000    
Fixed rate, brokered certificates of deposits 187,000,000 219,000,000  
Weighted-average interest rate paid on fixed rate, brokered certificates of deposits (in hundredths) 3.17% 3.62%  
Interest expense on time deposits reduction by interest rate swaps 1,500,000 1,600,000 4,000,000
Other Deposits Information [Abstract]      
Overdrawn transaction deposits reclassified as loan balances $ 9,200,000 $ 7,500,000