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Disclosure About Fair Value of Financial Instruments - Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Unrealized gains (in AOCL) $ 445 $ 584 $ 869    
Tax Increment Financing Bond [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 12,447 13,403      
Principal repayments (1,695) (1,540)      
Unrealized gains (in AOCL) 445 584      
Ending balance $ 11,197 12,447 13,403    
Maturity date Dec. 20, 2020        
Change in discount rate (in hundredths) 1.00%        
Fair value of Level 3 asset $ 12,447 $ 13,403 $ 13,403 $ 11,197 $ 12,447
Discount rate (in hundredths) 6.93% 8.40%      
Tax Increment Financing Bond [Member] | Minimum [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Impact of 100 basis points change in discount rate       300  
Tax Increment Financing Bond [Member] | Maximum [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Impact of 100 basis points change in discount rate       $ 300  
Impaired Real Estate Assets [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Discount rate (in hundredths)   10.00%      
Impaired real estate assets [Abstract]          
Fair value of Level 3 asset         $ 4,900
Capitalization rate (in hundredths)   9.50%