Credit Quality and Allowance for Loan Losses - Allowance for Loan Losses and Recorded Investment in Loans (Detail) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 13,423,922	$ 12,510,708
Recorded investment in loans	1,227,393,063	1,227,833,309
One- to Four-Family First Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	1,612,000	1,511,000
Recorded investment in loans	333,642,000	341,883,000
Home Equity Loans and Lines [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	1,123,000	728,000
Recorded investment in loans	90,124,000	88,821,000
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	4,681,000	4,177,000
Recorded investment in loans	465,552,000	427,515,000
Construction and Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	1,684,000	1,782,000
Recorded investment in loans	124,554,000	141,167,000
Multi-Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	351,000	361,000
Recorded investment in loans	46,132,000	46,369,000
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	3,501,000	3,439,000
Recorded investment in loans	128,784,000	139,810,000
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	472,000	513,000
Recorded investment in loans	38,605,000	42,268,000
Originated Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment, Allowance for loan losses	11,827,000	11,425,000
Individually evaluated for impairment, Allowance for loan losses	1,213,000	795,000
Collectively evaluated for impairment, Recorded investment in loans	922,875,000	879,132,000
Individually evaluated for impairment, Recorded investment in loans	5,895,000	5,558,000
Recorded investment in loans	928,770,000	884,690,000
Originated Loans [Member] \| One- to Four-Family First Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment, Allowance for loan losses	1,553,000	1,397,000
Individually evaluated for impairment, Allowance for loan losses		39,000
Collectively evaluated for impairment, Recorded investment in loans	193,987,000	176,392,000
Individually evaluated for impairment, Recorded investment in loans		252,000
Originated Loans [Member] \| Home Equity Loans and Lines [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment, Allowance for loan losses	713,000	654,000
Individually evaluated for impairment, Allowance for loan losses	348,000
Collectively evaluated for impairment, Recorded investment in loans	53,836,000	47,865,000
Individually evaluated for impairment, Recorded investment in loans	932,000
Originated Loans [Member] \| Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment, Allowance for loan losses	4,604,000	4,158,000
Individually evaluated for impairment, Allowance for loan losses		19,000
Collectively evaluated for impairment, Recorded investment in loans	367,243,000	321,361,000
Individually evaluated for impairment, Recorded investment in loans	23,000	462,000
Originated Loans [Member] \| Construction and Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment, Allowance for loan losses	1,677,000	1,763,000
Collectively evaluated for impairment, Recorded investment in loans	122,788,000	138,955,000
Originated Loans [Member] \| Multi-Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment, Allowance for loan losses	351,000	361,000
Collectively evaluated for impairment, Recorded investment in loans	30,635,000	26,941,000
Originated Loans [Member] \| Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment, Allowance for loan losses	2,460,000	2,579,000
Individually evaluated for impairment, Allowance for loan losses	865,000	737,000
Collectively evaluated for impairment, Recorded investment in loans	116,988,000	126,791,000
Individually evaluated for impairment, Recorded investment in loans	4,940,000	4,844,000
Originated Loans [Member] \| Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment, Allowance for loan losses	469,000	513,000
Collectively evaluated for impairment, Recorded investment in loans	37,398,000	40,827,000
Acquired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	384,000	291,000
Recorded investment in loans	298,623,000	343,143,000
Acquired Loans [Member] \| One- to Four-Family First Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	59,000	75,000
Recorded investment in loans	139,655,000	165,239,000
Acquired Loans [Member] \| Home Equity Loans and Lines [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	62,000	74,000
Recorded investment in loans	35,356,000	40,956,000
Acquired Loans [Member] \| Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	77,000
Recorded investment in loans	98,286,000	105,692,000
Acquired Loans [Member] \| Construction and Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	7,000	19,000
Recorded investment in loans	1,766,000	2,212,000
Acquired Loans [Member] \| Multi-Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment in loans	15,497,000	19,428,000
Acquired Loans [Member] \| Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	176,000	123,000
Recorded investment in loans	6,856,000	8,175,000
Acquired Loans [Member] \| Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	3,000
Recorded investment in loans	$ 1,207,000	$ 1,441,000

Loans and leases receivable net of deferred income covered and noncovered.

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- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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The balance of financing receivables that were collectively evaluated for impairment.

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ 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 (g)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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