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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 |

X
- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of expense related to loss from loan transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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