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Loans - Summary of Loans, Net of Unearned Income (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income $ 1,714,361 $ 1,649,754
Real estate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 1,484,056 1,422,966
Other loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 230,305 226,788
One- to four-family first mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 430,820 450,363
One- to four-family first mortgage | Real estate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 430,820 450,363
Home equity loans and lines    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 79,812 83,976
Home equity loans and lines | Real estate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 79,812 83,976
Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 722,807 640,575
Commercial real estate | Real estate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 722,807 640,575
Construction and land    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 195,748 193,597
Construction and land | Real estate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 195,748 193,597
Multi-family residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 54,869 54,455
Multi-family residential | Real estate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 54,869 54,455
Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 184,701 172,934
Commercial and industrial | Other loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 184,701 172,934
Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 45,604 53,854
Consumer | Other loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income $ 45,604 $ 53,854