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Summary of Dollar Roll Reverse Repurchase Agreements (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Securities Financing Transaction [Line Items]    
Estimated fair value of securities pledged $ 19,905 $ 46,401
Reverse repurchase agreements    
Securities Financing Transaction [Line Items]    
Payables for reverse repurchase agreements 19,791 46,637
Amortized cost of securities pledged 20,009 47,021
Estimated fair value of securities pledged $ 19,905 $ 46,401