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Fair Value Measurements - Nonrecurring (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Assets and liabilities measured at fair value        
Valuation allowance $ 34 $ 278    
Carrying value of other real estate owned 19,141 31,982 $ 41,537 $ 72,423
OREO Valuation allowance 14,127 19,229 $ 22,284 $ 31,454
Other real estate owned        
Assets and liabilities measured at fair value        
Outstanding balance   53,000    
OREO Valuation allowance   19,200    
OREO participations   1,800    
Nonrecurring        
Assets and liabilities measured at fair value        
Total 19,222 32,546    
Nonrecurring | Impaired loans        
Assets and liabilities measured at fair value        
Total 81 564    
Valuation allowance 34 278    
Decrease of specific allocations within the provision for loan losses 243 2,100    
Nonrecurring | Impaired loans | Carrying Amount        
Assets and liabilities measured at fair value        
Total 115 842    
Nonrecurring | Other real estate owned        
Assets and liabilities measured at fair value        
Total 19,141 31,982    
Outstanding balance 34,900      
OREO Valuation allowance 14,100      
OREO participations 1,700      
Nonrecurring | Level 3        
Assets and liabilities measured at fair value        
Total 19,222 32,546    
Nonrecurring | Level 3 | Impaired loans        
Assets and liabilities measured at fair value        
Total 81 564    
Nonrecurring | Level 3 | Other real estate owned        
Assets and liabilities measured at fair value        
Total $ 19,141 $ 31,982