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FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES (Change in Level 3 Assets and Liabilities) (Details 3)
$ in Thousands
6 Months Ended
Jun. 30, 2017
USD ($)
security
Jun. 30, 2016
USD ($)
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
Principal payments received (183) (166)
Unrealized net gain included in other comprehensive income 176 1,002
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 $ 12,189 $ 13,315
Additional disclosures    
Number of investment securities held | security 4  
Mortgage revenue bonds | Weighted average    
Additional disclosures    
Discount rate (as a percent) 4.54%