Loans Receivable, Net - Impaired Loans by Classification Type (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 12,626	$ 9,177
Total Recorded Investment	13,249	9,937
Unpaid Principal Balance	12,626	9,177
Total Unpaid Principal Balance	13,249	9,937
Related Allowance	0	0
Average Recorded Investment	9,707	15,312
Interest Income Recognized	958	583
Recorded Investment	623	760
Unpaid Principal Balance	623	760
Related Allowance	206	289
Average Recorded Investment	2,247	5,016
Total Average Recorded Investment	11,954	20,328	$ 31,600
Interest Income Recognized	35	15
Total Interest Income Recognized	993	598	$ 1,600
Multi-Family [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	0	0
Average Recorded Investment		1,135
One-to-Four Family Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		257
Unpaid Principal Balance		257
Related Allowance	0	0
Average Recorded Investment	710	1,235
Interest Income Recognized	27	35
Recorded Investment	274
Unpaid Principal Balance	274
Related Allowance	13
Average Recorded Investment	55
Interest Income Recognized	12
Home Equity Line of Credit [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	0	0
Average Recorded Investment	261	447
Interest Income Recognized	4	26
Construction [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	0	0
Land [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		515
Unpaid Principal Balance		515
Related Allowance	0	0
Average Recorded Investment	312	837
Interest Income Recognized		44
Average Recorded Investment		4,006
Non-Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	9,174	7,086
Unpaid Principal Balance	9,174	7,086
Related Allowance	0	0
Average Recorded Investment	5,973	8,979
Interest Income Recognized	693	395
Recorded Investment		2
Unpaid Principal Balance		2
Related Allowance		2
Average Recorded Investment	1,115	88
Interest Income Recognized		2
Farmland [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		444
Unpaid Principal Balance		444
Related Allowance	0	0
Average Recorded Investment	111	1,094
Interest Income Recognized		35
Average Recorded Investment		195
Junior Liens [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	0	0
Average Recorded Investment	2	6
Consumer Loans [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	0	0
Average Recorded Investment	5	8
Interest Income Recognized		2
Recorded Investment	208	217
Unpaid Principal Balance	208	217
Related Allowance	52	54
Average Recorded Investment	284	248
Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,452	875
Unpaid Principal Balance	3,452	875
Related Allowance	0	0
Average Recorded Investment	2,333	1,571
Interest Income Recognized	234	46
Recorded Investment	141	541
Unpaid Principal Balance	141	541
Related Allowance	141	233
Average Recorded Investment	793	479
Interest Income Recognized	$ 23	$ 13

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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