Stock Compensation Plans - Summary of Plan Activity (Detail) - $ / shares	Jul. 01, 2019	Jan. 01, 2019	Jul. 01, 2018	Jan. 01, 2018	Jul. 01, 2017	Jan. 01, 2017
Issue Date One [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares Issued, Price						$ 13.76
Shares Issued, Shares						18,512
Issue Date Two [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares Issued, Price					$ 13.52
Shares Issued, Shares					25,155
Issue Date Three [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares Issued, Price				$ 13.34
Shares Issued, Shares				20,662
Issue Date Four [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares Issued, Price			$ 11.57
Shares Issued, Shares			27,802
Issue Date Five [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares Issued, Price		$ 11.60
Shares Issued, Shares		24,834
Issue Date Six [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares Issued, Price	$ 12.24
Shares Issued, Shares	22,926