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Regulatory Capital Requirements - Components of Regulatory Capital (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]                
Total shareholders' equity $ 326,856 $ 317,554 $ 314,709 $ 309,334 $ 306,043 $ 301,484 $ 296,195 $ 294,265
Accumulated other comprehensive income (12,673)     (21,436)        
Home Savings [Member]                
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]                
Total shareholders' equity 293,118     281,006        
Accumulated other comprehensive income 12,688     21,450        
Intangible assets (20,715)     (20,981)        
Tier 1 Capital 285,091     281,475        
Allowance for loan losses and allowance for unfunded lending commitments limited to 1.25% of total risk-weighted assets 19,942     20,389        
Total risk-based capital $ 305,033     $ 301,864