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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, 2016
Mar. 31, 2015
Total gains or (losses) (realized/unrealized):    
Net impairement losses on investment securites (credit component) $ (387) $ (156)
Principal Repayments [1] (1,505) (2,461)
Available for Sale Securities    
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning balance [1] 27,297 36,212
Total gains or (losses) (realized/unrealized):    
Net impairement losses on investment securites (credit component) [1] (387) (156)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss [1] 1,258 619
Purchases [1] 0 100
Ending balance [1] $ 26,663 $ 34,314
[1] Amounts mostly related to private label mortgage-backed securities.