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FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES (Change in Level 3 Assets and Liabilities) (Details 3)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
security
Mar. 31, 2016
USD ($)
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
Principal payments received (89) (83)
Unrealized net gain included in other comprehensive income 34 259
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 $ 12,141 $ 12,655
Additional disclosures    
Number of investment securities held | security 4  
Mortgage revenue bonds | Weighted average    
Additional disclosures    
Discount rate (as a percent) 4.73%