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FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES (Details 3)
$ in Thousands
6 Months Ended
Jun. 30, 2015
USD ($)
item
Jun. 30, 2014
USD ($)
item
States and political subdivisions debt securities    
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 $ 13,095 $ 10,518
Principal payments received (812) (139)
Unrealized net gain included in other comprehensive income 345 76
Purchases   2,269
Aggregate fair value / Balance at the end of the period 12,628 12,724
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 $ 12,600 $ 12,700
Additional disclosures    
Number of investment securities held | item 4 4
Mortgage revenue bonds | Weighted average    
Additional disclosures    
Discount rate (as a percent) 4.17%