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Summary of Financial Effects of Troubled Debt Restructurings (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($) Investment	Jun. 30, 2016 USD ($) Investment	Jun. 30, 2017 USD ($) Investment	Jun. 30, 2016 USD ($) Investment
Financing Receivable, Modifications [Line Items]
Number of loans classified as a non-accrual TDRs | Investment	16	2	34	6
Pre-Modification Recorded Investment	$ 23,296	$ 652	$ 31,523	$ 11,214
Post-Modification Recorded Investment	19,379	758	24,145	10,439
Trouble debt restructuring, charge-off amount	825		4,104	47
Capitalized interest	$ 7	$ 2	$ 12	$ 6
One-to-four family
Financing Receivable, Modifications [Line Items]
Number of loans classified as a non-accrual TDRs | Investment	3	1	4	3
Pre-Modification Recorded Investment	$ 544	$ 1	$ 809	$ 477
Post-Modification Recorded Investment	$ 657	$ 108	$ 994	$ 636
Weighted Average Interest Rate, Pre-Modification	5.90%	4.13%	5.93%	3.62%
Weighted Average Interest Rate, Post-Modification	2.00%	2.00%	2.21%	3.07%
Capitalized interest	$ 7	$ 2	$ 12	$ 6
Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Number of loans classified as a non-accrual TDRs | Investment	13	1	30	2
Pre-Modification Recorded Investment	$ 22,752	$ 651	$ 30,714	$ 1,397
Post-Modification Recorded Investment	$ 18,722	$ 650	$ 23,151	$ 1,300
Weighted Average Interest Rate, Pre-Modification	3.49%	3.30%	3.45%	3.30%
Weighted Average Interest Rate, Post-Modification	3.45%	3.30%	3.45%	3.20%
Trouble debt restructuring, charge-off amount	$ 825		$ 4,104	$ 47
Multi-Family
Financing Receivable, Modifications [Line Items]
Number of loans classified as a non-accrual TDRs | Investment				1
Pre-Modification Recorded Investment				$ 9,340
Post-Modification Recorded Investment				$ 8,503
Weighted Average Interest Rate, Pre-Modification				4.63%
Weighted Average Interest Rate, Post-Modification				4.00%

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Number of financing receivables that have been modified by troubled debt restructurings.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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-Topic 310
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-Section 50
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The gross interest income that would have been recorded in the period on troubled debt restructurings, if the loans had been current in accordance with their original terms and had been outstanding throughout the period or since origination, if held for part of the period.

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