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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, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Non-vested beginning of year, Shares | shares 176,538
Vested, Shares | shares (43,358)
Granted, Shares | shares 84,526
Forfeited, Shares | shares (4,137)
Non-vested, end of year, Shares | shares 213,569
Non-vested beginning of year, Weighted Average Grant Date Fair Value | $ / shares $ 16.90
Vested, Weighted Average Grant Date Fair Value | $ / shares 11.17
Granted, Weighted Average Grant Date Fair Value | $ / shares 16.74
Forfeited, Weighted Average Grant Date Fair Value | $ / shares 18.23
Non-vested end of year, Weighted Average Grant Date Fair Value | $ / shares $ 17.97