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Share-Based Compensation - Summary of Status of Non-vested, Restricted and Performance Shares (Detail) - Restricted and Performance Shares [Member]
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Non-vested beginning of year, Shares | shares 123,571
Vested, Shares | shares (72,563)
Granted, Shares | shares 19,951
Forfeited, Shares | shares 0
Non-vested, end of year, Shares | shares 70,959
Non-vested beginning of year, Weighted Average Grant Date Fair Value | $ / shares $ 12.13
Vested, Weighted Average Grant Date Fair Value | $ / shares 9.69
Granted, Weighted Average Grant Date Fair Value | $ / shares 15.57
Forfeited, Weighted Average Grant Date Fair Value | $ / shares 0
Non-vested end of year, Weighted Average Grant Date Fair Value | $ / shares $ 15.59