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FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES (Change in Level 3 Assets and Liabilities) (Details 3)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
security
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
States and political subdivisions      
Changes in Level 3 assets and liabilities measured at fair value on a recurring basis      
Aggregate fair value / Balance at the beginning of the period $ 12,196 $ 12,479 $ 12,479
Principal payments received (268) (268)  
Unrealized net gain included in other comprehensive income 170 822  
Aggregate fair value / Balance at the end of the period     $ 12,196
Mortgage revenue bonds      
Changes in Level 3 assets and liabilities measured at fair value on a recurring basis      
Aggregate fair value / Balance at the end of the period $ 12,098 $ 13,033  
Additional disclosures      
Number of investment securities held | security 4    
Mortgage revenue bonds | Weighted average      
Additional disclosures      
Discount rate (as a percent) 4.50% 3.89% 3.00%
Mortgage Servicing Rights      
Additional disclosures      
Discount rate (as a percent) 9.50% 9.50% 9.50%
Forecasted constant prepayment rate 16.50% 16.70% 14.30%