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Additional Information about Impaired Loans (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	$ 54,920	$ 52,169
Impaired loans with no related allowance, Unpaid Principal Balance	136,894	126,513
Impaired loans with no related allowance, Average Recorded Investment	51,766	63,146
Impaired loans with no related allowance, Interest Income Recognized	1,772	4,013
Impaired loans with an allowance recorded, Average Recorded Investment	7,500	20
Total impaired loans, Recorded Investment	54,920	52,169
Total impaired loans, Unpaid Principal Balance	136,894	126,513
Total impaired loans, Average Recorded Investment	59,266	63,166
Total impaired loans, Interest Income Recognized	1,772	4,013
Multi-Family
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	3,906	4,220
Impaired loans with no related allowance, Unpaid Principal Balance	6,981	7,168
Impaired loans with no related allowance, Average Recorded Investment	3,988	6,114
Impaired loans with no related allowance, Interest Income Recognized	127	340
Total impaired loans, Recorded Investment	3,906	4,220
Total impaired loans, Unpaid Principal Balance	6,981	7,168
Total impaired loans, Average Recorded Investment	3,988	6,114
Total impaired loans, Interest Income Recognized	127	340
Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	2,255	2,256
Impaired loans with no related allowance, Unpaid Principal Balance	7,371	7,371
Impaired loans with no related allowance, Average Recorded Investment	2,256	3,234
Total impaired loans, Recorded Investment	2,255	2,256
Total impaired loans, Unpaid Principal Balance	7,371	7,371
Total impaired loans, Average Recorded Investment	2,256	3,234
One-to-four family
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	757	1,022
Impaired loans with no related allowance, Unpaid Principal Balance	775	1,076
Impaired loans with no related allowance, Average Recorded Investment	884	1,576
Impaired loans with no related allowance, Interest Income Recognized	10	26
Total impaired loans, Recorded Investment	757	1,022
Total impaired loans, Unpaid Principal Balance	775	1,076
Total impaired loans, Average Recorded Investment	884	1,576
Total impaired loans, Interest Income Recognized	10	26
Acquisition, development, and construction
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	4,759	8,296
Impaired loans with no related allowance, Unpaid Principal Balance	5,659	9,197
Impaired loans with no related allowance, Average Recorded Investment	5,647	9,238
Impaired loans with no related allowance, Interest Income Recognized	251	590
Total impaired loans, Recorded Investment	4,759	8,296
Total impaired loans, Unpaid Principal Balance	5,659	9,197
Total impaired loans, Average Recorded Investment	5,647	9,238
Total impaired loans, Interest Income Recognized	251	590
Other
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	43,243	36,375
Impaired loans with no related allowance, Unpaid Principal Balance	116,108	101,701
Impaired loans with no related allowance, Average Recorded Investment	38,991	42,984
Impaired loans with no related allowance, Interest Income Recognized	1,384	3,057
Impaired loans with an allowance recorded, Average Recorded Investment	7,500	20
Total impaired loans, Recorded Investment	43,243	36,375
Total impaired loans, Unpaid Principal Balance	116,108	101,701
Total impaired loans, Average Recorded Investment	46,491	43,004
Total impaired loans, Interest Income Recognized	$ 1,384	$ 3,057

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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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