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FAIR VALUE - Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Total gains or (losses) (realized/unrealized):    
Principal Repayments [1] $ (1,519) $ (2,050)
Available for Sale Securities    
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning balance [1] 19,855 22,914
Total gains or (losses) (realized/unrealized):    
Included in earnings [1] 0 0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss [1] 472 518
Ending balance [1] $ 18,808 $ 21,382
[1]
Amounts mostly related to private label MBS.