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Disclosures About Fair Value of Financial Instruments - Nonrecurring Basis (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Assets Measured on a Nonrecurring Basis:      
Impaired loans $ 72,462   $ 93,324
Other real estate owned 802   5,220
Loans held for sale 17,673   23,989
Level 3      
Assets Measured on a Nonrecurring Basis:      
Other real estate owned 802   $ 5,220
Loans held for sale 15,503    
Level 3 | Loans held for investment      
Fair value disclosure      
Loans held for investment 3,119,653    
Level 3 | Real estate acquired by foreclosure      
Fair value disclosure      
Real estate acquired by foreclosure $ 802    
Level 3 | Minimum | Loans held for investment      
Fair value disclosure      
Prepayment speed 0.00%    
Discount rate 0.00%    
Level 3 | Minimum | Real estate acquired by foreclosure      
Fair value disclosure      
Discount rate 8.00%    
Level 3 | Maximum | Loans held for investment      
Fair value disclosure      
Prepayment speed 99.14%    
Discount rate 18.16%    
Level 3 | Weighted Average | Loans held for investment      
Fair value disclosure      
Prepayment speed 17.23%    
Discount rate 4.08%    
Nonrecurring      
Assets Measured on a Nonrecurring Basis:      
Impaired loans $ 18,916 $ 54,123  
Impaired loans, adjustment 7,459 14,999  
Other real estate owned 802    
Other real estate owned, adjustment 118    
Loans held for sale 15,503    
Loans held for sale, adjustment 1,847    
Nonrecurring | Level 3      
Assets Measured on a Nonrecurring Basis:      
Impaired loans 18,916 $ 54,123  
Other real estate owned 802    
Loans held for sale $ 15,503