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Disclosures About Fair Value of Financial Instruments - Nonrecurring Basis (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Assets Measured on a Nonrecurring Basis:      
Impaired loans $ 98,830   $ 44,993
Other real estate owned 2,801   12,122
Other real estate owned, adjustment 1,048 $ 530  
Level 3 [Member]      
Assets Measured on a Nonrecurring Basis:      
Other real estate owned 2,801   $ 12,122
Level 3 [Member] | Loans held for investment      
Fair value disclosure      
Loans held for investment 3,056,110    
Level 3 [Member] | Real estate acquired by foreclosure      
Fair value disclosure      
Real estate acquired by foreclosure $ 2,801    
Level 3 [Member] | Minimum | Loans held for investment      
Fair value disclosure      
Prepayment speed 0.00%    
Discount rate 1.28%    
Level 3 [Member] | Minimum | Real estate acquired by foreclosure      
Fair value disclosure      
Discount rate 8.00%    
Level 3 [Member] | Maximum | Loans held for investment      
Fair value disclosure      
Prepayment speed 97.55%    
Discount rate 11.62%    
Level 3 [Member] | Maximum | Real estate acquired by foreclosure      
Fair value disclosure      
Discount rate 12.55%    
Level 3 [Member] | Weighted Average | Loans held for investment      
Fair value disclosure      
Prepayment speed 28.57%    
Discount rate (3.42%)    
Level 3 [Member] | Weighted Average | Real estate acquired by foreclosure      
Fair value disclosure      
Discount rate (8.54%)    
Nonrecurring [Member]      
Assets Measured on a Nonrecurring Basis:      
Impaired loans $ 58,549 19,846  
Impaired loans, adjustment 11,570 2,462  
Other real estate owned 2,339 1,665  
Other real estate owned, adjustment 1,048 155  
Nonrecurring [Member] | Level 3 [Member]      
Assets Measured on a Nonrecurring Basis:      
Impaired loans 58,549 19,846  
Other real estate owned $ 2,339 $ 1,665