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Credit Quality and Allowance for Loan Losses - Schedule of Activity in Allowance for Loan Losses (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance     $ 12,511,000 $ 9,547,000
Charge-offs     (430,000) (249,000)
Recoveries     226,000 195,000
Provision $ 660,447 $ 800,000 1,117,278 2,700,000
Ending balance 13,424,000 12,193,000 13,424,000 12,193,000
Originated Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance     12,220,000 9,174,000
Charge-offs     (430,000) (249,000)
Recoveries     226,000 101,000
Provision     1,024,000 2,796,000
Ending balance 13,040,000 11,822,000 13,040,000 11,822,000
Acquired Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance     291,000 373,000
Recoveries       94,000
Provision     93,000 (96,000)
Ending balance 384,000 371,000 384,000 371,000
One- to Four-Family First Mortgage [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance     1,511,000 1,464,000
Provision     101,000 40,000
Ending balance 1,612,000 1,504,000 1,612,000 1,504,000
One- to Four-Family First Mortgage [Member] | Originated Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance     1,436,000 1,372,000
Provision     117,000 32,000
Ending balance 1,553,000 1,404,000 1,553,000 1,404,000
One- to Four-Family First Mortgage [Member] | Acquired Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance     75,000 92,000
Provision     (16,000) 8,000
Ending balance 59,000 100,000 59,000 100,000
Home Equity Loans and Lines [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance     728,000 760,000
Charge-offs     (10,000) (9,000)
Recoveries     18,000 2,000
Provision     387,000 (17,000)
Ending balance 1,123,000 736,000 1,123,000 736,000
Home Equity Loans and Lines [Member] | Originated Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance     654,000 536,000
Charge-offs     (10,000) (9,000)
Recoveries     18,000 2,000
Provision     399,000 133,000
Ending balance 1,061,000 662,000 1,061,000 662,000
Home Equity Loans and Lines [Member] | Acquired Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance     74,000 224,000
Provision     (12,000) (150,000)
Ending balance 62,000 74,000 62,000 74,000
Commercial Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance     4,177,000 3,152,000
Charge-offs     (4,000)  
Recoveries       1,000
Provision     508,000 883,000
Ending balance 4,681,000 4,036,000 4,681,000 4,036,000
Commercial Real Estate [Member] | Originated Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance     4,177,000 3,152,000
Charge-offs     (4,000)  
Recoveries       1,000
Provision     431,000 883,000
Ending balance 4,604,000 4,036,000 4,604,000 4,036,000
Commercial Real Estate [Member] | Acquired Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance     0  
Provision     77,000  
Ending balance 77,000   77,000  
Construction and Land [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance     1,782,000 1,417,000
Recoveries       51,000
Provision     (98,000) 277,000
Ending balance 1,684,000 1,745,000 1,684,000 1,745,000
Construction and Land [Member] | Originated Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance     1,763,000 1,360,000
Recoveries       51,000
Provision     (86,000) 260,000
Ending balance 1,677,000 1,671,000 1,677,000 1,671,000
Construction and Land [Member] | Acquired Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance     19,000 57,000
Provision     (12,000) 17,000
Ending balance 7,000 74,000 7,000 74,000
Multi-Family Residential [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance     361,000 173,000
Provision     (10,000) 169,000
Ending balance 351,000 342,000 351,000 342,000
Multi-Family Residential [Member] | Originated Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance     361,000 173,000
Provision     (10,000) 169,000
Ending balance 351,000 342,000 351,000 342,000
Multi-Family Residential [Member] | Acquired Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance     0  
Commercial and Industrial [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance     3,439,000 2,010,000
Charge-offs     (358,000) (128,000)
Recoveries     203,000 137,000
Provision     217,000 1,279,000
Ending balance 3,501,000 3,298,000 3,501,000 3,298,000
Commercial and Industrial [Member] | Originated Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance     3,316,000 2,010,000
Charge-offs     (358,000) (128,000)
Recoveries     203,000 43,000
Provision     164,000 1,250,000
Ending balance 3,325,000 3,175,000 3,325,000 3,175,000
Commercial and Industrial [Member] | Acquired Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance     123,000  
Recoveries       94,000
Provision     53,000 29,000
Ending balance 176,000 123,000 176,000 123,000
Consumer [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance     513,000 571,000
Charge-offs     (58,000) (112,000)
Recoveries     5,000 4,000
Provision     12,000 69,000
Ending balance 472,000 532,000 472,000 532,000
Consumer [Member] | Originated Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance     513,000 571,000
Charge-offs     (58,000) (112,000)
Recoveries     5,000 4,000
Provision     9,000 69,000
Ending balance 469,000 $ 532,000 469,000 $ 532,000
Consumer [Member] | Acquired Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance     0  
Provision     3,000  
Ending balance $ 3,000   $ 3,000