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Summary of Financial Effects of Troubled Debt Restructurings (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) Investment	Sep. 30, 2017 USD ($) Investment	Sep. 30, 2018 USD ($) Investment	Sep. 30, 2017 USD ($) Investment
Financing Receivable, Modifications [Line Items]
Number of loans classified as a non-accrual TDRs | Investment		24	19	58
Pre-Modification Recorded Investment		$ 26,654	$ 7,814	$ 58,178
Post-Modification Recorded Investment		16,272	5,286	33,315
Trouble debt restructuring, charge-off amount		$ 6,350	$ 2,308	11,079
Capitalized interest				$ 12
Acquisition, Development and Construction
Financing Receivable, Modifications [Line Items]
Number of loans classified as a non-accrual TDRs | Investment		2	1	2
Pre-Modification Recorded Investment		$ 8,652	$ 900	$ 8,652
Post-Modification Recorded Investment		$ 8,652	$ 900	$ 8,652
Weighted Average Interest Rate, Pre-Modification		5.50%	4.50%	5.50%
Weighted Average Interest Rate, Post-Modification		5.50%	4.50%	5.50%
Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Number of loans classified as a non-accrual TDRs | Investment	6	22	18	52
Pre-Modification Recorded Investment	$ 1,848	$ 18,002	$ 6,914	$ 48,716
Post-Modification Recorded Investment	$ 1,212	$ 7,620	$ 4,386	$ 23,673
Weighted Average Interest Rate, Pre-Modification	3.36%	3.18%	3.30%	3.36%
Weighted Average Interest Rate, Post-Modification	3.28%	2.91%	3.18%	3.29%
Trouble debt restructuring, charge-off amount	$ 545	$ 6,350	$ 2,308	$ 11,079
One-to-four family
Financing Receivable, Modifications [Line Items]
Number of loans classified as a non-accrual TDRs | Investment				4
Pre-Modification Recorded Investment				$ 810
Post-Modification Recorded Investment				$ 990
Weighted Average Interest Rate, Pre-Modification				5.93%
Weighted Average Interest Rate, Post-Modification				2.21%
Capitalized interest				$ 12

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