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Disclosures About Fair Value of Financial Instruments - Nonrecurring Basis (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Assets Measured on a Nonrecurring Basis:      
Impaired loans $ 93,324 $ 44,993  
Other real estate owned 5,220 12,122  
Other real estate owned, adjustment 1,048 530 $ 141
Fair value disclosure      
Loans held for investment 3,128,966    
Real estate acquired by foreclosure 5,220    
Level 3      
Assets Measured on a Nonrecurring Basis:      
Other real estate owned $ 5,220 12,122  
Level 3 | Minimum | Loans held for investment      
Fair value disclosure      
Prepayment speed 0.00%    
Discount rate 0.17%    
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 99.50%    
Discount rate 11.36%    
Level 3 | Maximum | Real estate acquired by foreclosure      
Fair value disclosure      
Discount rate 22.00%    
Level 3 | Weighted Average | Loans held for investment      
Fair value disclosure      
Prepayment speed 28.59%    
Discount rate 4.04%    
Level 3 | Weighted Average | Real estate acquired by foreclosure      
Fair value disclosure      
Discount rate 14.18%    
Nonrecurring      
Assets Measured on a Nonrecurring Basis:      
Impaired loans $ 23,613 32,988  
Impaired loans, adjustment 21,886 14,581  
Other real estate owned 1,721 1,665  
Other real estate owned, adjustment 1,016 155  
Nonrecurring | Level 3      
Assets Measured on a Nonrecurring Basis:      
Impaired loans 23,613 32,988  
Other real estate owned $ 1,721 $ 1,665