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Allowance for Probable Loan Losses (Details 3) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Loan loss allowances, financing receivable past due    
Non-accrual loans, total $ 46,227 $ 63,559
Commercial    
Loan loss allowances, financing receivable past due    
Non-accrual loans, total 33,145 40,121
Commercial Real Estate: Other Construction and Land Development    
Loan loss allowances, financing receivable past due    
Non-accrual loans, total 4,434 8,621
Commercial real estate: farmland and commercial    
Loan loss allowances, financing receivable past due    
Non-accrual loans, total 7,366 11,903
Commercial real estate: multifamily    
Loan loss allowances, financing receivable past due    
Non-accrual loans, total 806 835
Residential: first lien    
Loan loss allowances, financing receivable past due    
Non-accrual loans, total 422 527
Residential: junior lien    
Loan loss allowances, financing receivable past due    
Non-accrual loans, total 19 1,523
Consumer    
Loan loss allowances, financing receivable past due    
Non-accrual loans, total $ 35 $ 29