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Fair Value Measurements - Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Jan. 01, 2015
Sep. 13, 2013
Nov. 30, 2012
SWS        
Fair value measurements        
Fair value of loans acquired   $ 863,819    
SWS | PCI loans        
Fair value measurements        
Fair value of loans acquired   73,459    
Level 3 | Plains Capital | PCI loans        
Fair value measurements        
Fair value of loans acquired       $ 172,900
Level 3 | Plains Capital | PCI loans | Weighted average        
Fair Value Inputs [Abstract]        
Weighted average default rate 57.00%      
Weighted average loss severity rate 49.00%      
Weighted average prepayment speed 0.00%      
Weighted average expected loss 28.00%      
Level 3 | FNB | PCI loans        
Fair value measurements        
Fair value of loans acquired     $ 822,800  
Level 3 | FNB | PCI loans | Weighted average        
Fair Value Inputs [Abstract]        
Weighted average default rate 56.00%      
Weighted average loss severity rate 35.00%      
Weighted average prepayment speed 6.00%      
Weighted average expected loss 20.00%      
Level 3 | SWS | PCI loans        
Fair value measurements        
Fair value of loans acquired   $ 73,500    
Level 3 | SWS | PCI loans | Weighted average        
Fair Value Inputs [Abstract]        
Weighted average default rate 48.00%      
Weighted average loss severity rate 31.00%      
Weighted average prepayment speed 0.00%      
Weighted average expected loss 15.00%