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FAIR VALUE OF FINANCIAL INSTRUMENTS- Unobservable inputs (Level 3) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Corporate securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance $ 7,734 $ 6,736 $ 7,480  
Transferred from Level 2 0 0 0 $ 6,749
Purchases of investment securities recognized as Level 3   3,000   3,000
Total realized in earnings 85 (85) 180 (158)
Total unrealized in other comprehensive income (3) 20 242 (2)
Net settlements (principal and interest) (3,076) (76) (3,162) (140)
Ending balance $ 4,740 9,765 4,740 9,765
Non-agency mortgage-backed securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance   2 1  
Transferred from Level 2       2
Net settlements (principal and interest)     $ (1)  
Ending balance   $ 2   $ 2