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Fair Value Measurements and Disclosures - Summary of Financial Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Assets    
Repossessed assets $ 454 $ 2,893
Impaired loans 4,682 4,763
Total 5,136 7,656
Level 3 [Member]    
Assets    
Repossessed assets 454 2,893
Impaired loans 4,682 4,763
Total $ 5,136 $ 7,656