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Credit Quality and Allowance for Loan Losses - Summary of Information Pertaining to Non Accrual Non Covered Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 17,701 $ 13,753
One- to Four-Family First Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans 2,302 1,724
Home Equity Loans and Lines [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans 1,923 1,088
Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans 3,255 1,963
Construction and Land [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans   75
Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans 9,900 8,542
Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans 321 361
Originated Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans 16,481 12,290
Originated Loans [Member] | One- to Four-Family First Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans 1,425 891
Originated Loans [Member] | Home Equity Loans and Lines [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans 1,823 998
Originated Loans [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans 3,255 1,799
Originated Loans [Member] | Construction and Land [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans   12
Originated Loans [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans 9,657 8,230
Originated Loans [Member] | Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans 321 360
Acquired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans 1,220 1,463
Acquired Loans [Member] | One- to Four-Family First Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans 877 833
Acquired Loans [Member] | Home Equity Loans and Lines [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans 100 90
Acquired Loans [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans   164
Acquired Loans [Member] | Construction and Land [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans   63
Acquired Loans [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans $ 243 312
Acquired Loans [Member] | Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans   $ 1