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Employee and Director Benefit Plans - Amounts Recognized in the Accumulated Post-Retirement Benefit Obligation and Other Comprehensive Income (Loss) (Detail)
$ in Thousands
Dec. 31, 2015
USD ($)
Postemployment Benefits [Abstract]  
Unrecognized actuarial gain $ 1,176
Amortization of prior service cost (82)
Total accumulated other comprehensive gain $ 1,094