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Credit Quality and Allowance for Loan Losses - Schedule of Loan Portfolio by Credit Quality Classification (Detail) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]    
Total loans $ 1,227,393,063 $ 1,227,833,309
Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 928,770,000 884,690,000
Total loans 928,770,000 884,690,000
Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 298,623,000 343,143,000
Total loans 298,623,000 343,143,000
One- to Four-Family First Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 333,642,000 341,883,000
One- to Four-Family First Mortgage [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 193,987,000 176,644,000
One- to Four-Family First Mortgage [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 139,655,000 165,239,000
Total loans 139,655,000 165,239,000
Home Equity Loans and Lines [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 90,124,000 88,821,000
Home Equity Loans and Lines [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 54,768,000 47,865,000
Home Equity Loans and Lines [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 35,356,000 40,956,000
Total loans 35,356,000 40,956,000
Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 465,552,000 427,515,000
Commercial Real Estate [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 367,266,000 321,823,000
Commercial Real Estate [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 98,286,000 105,692,000
Total loans 98,286,000 105,692,000
Construction and Land [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 124,554,000 141,167,000
Construction and Land [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 122,788,000 138,955,000
Construction and Land [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,766,000 2,212,000
Total loans 1,766,000 2,212,000
Multi-Family Residential [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 46,132,000 46,369,000
Multi-Family Residential [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 30,635,000 26,941,000
Multi-Family Residential [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 15,497,000 19,428,000
Total loans 15,497,000 19,428,000
Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 128,784,000 139,810,000
Commercial and Industrial [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 121,928,000 131,635,000
Commercial and Industrial [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 6,856,000 8,175,000
Total loans 6,856,000 8,175,000
Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 38,605,000 42,268,000
Consumer [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 37,398,000 40,827,000
Consumer [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,207,000 1,441,000
Total loans 1,207,000 1,441,000
Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,184,489,000 1,184,796,000
Pass [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 895,328,000 853,370,000
Pass [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 289,161,000 331,426,000
Pass [Member] | One- to Four-Family First Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 328,558,000 337,082,000
Pass [Member] | One- to Four-Family First Mortgage [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 191,783,000 175,045,000
Pass [Member] | One- to Four-Family First Mortgage [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 136,775,000 162,037,000
Pass [Member] | Home Equity Loans and Lines [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 87,798,000 87,348,000
Pass [Member] | Home Equity Loans and Lines [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 52,588,000 46,536,000
Pass [Member] | Home Equity Loans and Lines [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 35,210,000 40,812,000
Pass [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 452,607,000 413,063,000
Pass [Member] | Commercial Real Estate [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 357,342,000 311,517,000
Pass [Member] | Commercial Real Estate [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 95,265,000 101,546,000
Pass [Member] | Construction and Land [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 122,755,000 139,537,000
Pass [Member] | Construction and Land [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 121,459,000 138,000,000
Pass [Member] | Construction and Land [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,296,000 1,537,000
Pass [Member] | Multi-Family Residential [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 45,968,000 46,191,000
Pass [Member] | Multi-Family Residential [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 30,635,000 26,941,000
Pass [Member] | Multi-Family Residential [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 15,333,000 19,250,000
Pass [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 108,673,000 119,805,000
Pass [Member] | Commercial and Industrial [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 104,566,000 114,962,000
Pass [Member] | Commercial and Industrial [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 4,107,000 4,843,000
Pass [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 38,130,000 41,770,000
Pass [Member] | Consumer [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 36,955,000 40,369,000
Pass [Member] | Consumer [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,175,000 1,401,000
Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 7,635,000 10,687,000
Special Mention [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 5,213,000 7,528,000
Special Mention [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 2,422,000 3,159,000
Special Mention [Member] | One- to Four-Family First Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 874,000 521,000
Special Mention [Member] | One- to Four-Family First Mortgage [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 367,000 276,000
Special Mention [Member] | One- to Four-Family First Mortgage [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 507,000 245,000
Special Mention [Member] | Home Equity Loans and Lines [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 320,000 378,000
Special Mention [Member] | Home Equity Loans and Lines [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 292,000 331,000
Special Mention [Member] | Home Equity Loans and Lines [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 28,000 47,000
Special Mention [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 2,601,000 3,580,000
Special Mention [Member] | Commercial Real Estate [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 746,000 822,000
Special Mention [Member] | Commercial Real Estate [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,855,000 2,758,000
Special Mention [Member] | Construction and Land [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 215,000 93,000
Special Mention [Member] | Construction and Land [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 215,000 22,000
Special Mention [Member] | Construction and Land [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans   71,000
Special Mention [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 3,471,000 5,979,000
Special Mention [Member] | Commercial and Industrial [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 3,471,000 5,979,000
Special Mention [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 154,000 136,000
Special Mention [Member] | Consumer [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 122,000 98,000
Special Mention [Member] | Consumer [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 32,000 38,000
Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 35,269,000 32,350,000
Substandard [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 28,229,000 23,792,000
Substandard [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 7,040,000 8,558,000
Substandard [Member] | One- to Four-Family First Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 4,210,000 4,280,000
Substandard [Member] | One- to Four-Family First Mortgage [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,837,000 1,323,000
Substandard [Member] | One- to Four-Family First Mortgage [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 2,373,000 2,957,000
Substandard [Member] | Home Equity Loans and Lines [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 2,006,000 1,095,000
Substandard [Member] | Home Equity Loans and Lines [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,888,000 998,000
Substandard [Member] | Home Equity Loans and Lines [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 118,000 97,000
Substandard [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 10,344,000 10,872,000
Substandard [Member] | Commercial Real Estate [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 9,178,000 9,484,000
Substandard [Member] | Commercial Real Estate [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,166,000 1,388,000
Substandard [Member] | Construction and Land [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,584,000 1,537,000
Substandard [Member] | Construction and Land [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,114,000 933,000
Substandard [Member] | Construction and Land [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 470,000 604,000
Substandard [Member] | Multi-Family Residential [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 164,000 178,000
Substandard [Member] | Multi-Family Residential [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 164,000 178,000
Substandard [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 16,640,000 14,026,000
Substandard [Member] | Commercial and Industrial [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 13,891,000 10,694,000
Substandard [Member] | Commercial and Industrial [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 2,749,000 3,332,000
Substandard [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 321,000 362,000
Substandard [Member] | Consumer [Member] | Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans $ 321,000 360,000
Substandard [Member] | Consumer [Member] | Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans   $ 2,000