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Loans (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
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Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Loans        
Total $ 2,073,110,000 $ 2,051,344,000    
Less held for sale 40,003,000 15,249,000    
Total loans before allowance for loan losses 2,033,107,000 2,036,095,000    
Less allowance for loan losses 48,012,000 58,506,000 76,038,000 100,179,000
Net loans 1,985,095,000 1,977,589,000    
Net deferred loan origination costs 800,000 700,000    
Minimum target period for lending via intermediate term loans 0 years      
Maximum target period for lending via intermediate term loans 7 years      
Geographical area from lending offices which attempt is made to lend short and intermediate term loans (in miles) 125      
Direct and indirect maximum total borrowing relationship limit 20,000,000      
Borrowing relationships, threshold above which board of directors will review annually 20,000,000      
Number of primary areas for lending loan 5      
Illinois
        
Loans        
Total 1,691,946,000 1,669,967,000    
Florida
        
Loans        
Total 277,464,000 283,147,000    
Total loans before allowance for loan losses 275,182,000 281,953,000    
Less allowance for loan losses 15,433,000 19,469,000 29,849,000 51,164,000
Indiana
        
Loans        
Total 103,700,000 98,230,000    
Commercial
        
Loans        
Total 433,688,000 407,855,000    
Commercial | Illinois
        
Loans        
Total 399,300,000 375,238,000    
Commercial | Florida
        
Loans        
Total 10,861,000 10,830,000    
Total loans before allowance for loan losses 10,861,000 10,830,000    
Less allowance for loan losses 1,437,000 1,939,000 2,013,000 498,000
Commercial | Indiana
        
Loans        
Total 23,527,000 21,787,000    
Commercial real estate
        
Loans        
Total 981,132,000 980,216,000    
Commercial real estate | Illinois
        
Loans        
Total 777,752,000 793,769,000    
Commercial real estate | Florida
        
Loans        
Total 138,170,000 135,360,000    
Total loans before allowance for loan losses 138,170,000 135,360,000    
Less allowance for loan losses 6,062,000 8,413,000 13,291,000 14,098,000
Commercial real estate | Indiana
        
Loans        
Total 65,210,000 51,087,000    
Real estate construction
        
Loans        
Total 86,101,000 104,865,000    
Real estate construction | Illinois
        
Loans        
Total 67,152,000 72,569,000    
Real estate construction | Florida
        
Loans        
Total 15,972,000 16,186,000    
Total loans before allowance for loan losses 15,972,000 16,186,000    
Less allowance for loan losses 2,315,000 2,936,000 4,717,000 29,805,000
Real estate construction | Indiana
        
Loans        
Total 2,977,000 16,110,000    
Retail real estate
        
Loans        
Total 559,836,000 540,146,000    
Minimum term of long-term loans entity sells to secondary market purchasers 5 years      
Maximum term of loans entity retains 5 years      
Retail real estate | Illinois
        
Loans        
Total 435,911,000 410,844,000    
Retail real estate | Florida
        
Loans        
Total 112,052,000 120,190,000    
Total loans before allowance for loan losses 109,770,000 118,996,000    
Less allowance for loan losses 5,614,000 6,160,000 9,748,000 6,606,000
Retail real estate | Indiana
        
Loans        
Total 11,873,000 9,112,000    
Retail other
        
Loans        
Total 12,353,000 18,262,000    
Retail other | Illinois
        
Loans        
Total 11,831,000 17,547,000    
Retail other | Florida
        
Loans        
Total 409,000 581,000    
Total loans before allowance for loan losses 409,000 581,000    
Less allowance for loan losses 5,000 21,000 80,000 157,000
Retail other | Indiana
        
Loans        
Total $ 113,000 $ 134,000