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Loans Receivable and Allowance for Loan Losses - Summary of Recorded Investment Net Charge-Offs, Unpaid Principal Balance and Related Allowance for Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, Total	$ 31,487		$ 31,487		$ 29,411
Unpaid Principal Balance
Unpaid Principal Balance, Total	31,897		31,897		30,692
Related Allowance	2,791		2,791		1,360
Average Recorded Investment
Average Recorded Investment, Total	35,422	$ 57,000	33,419	$ 52,868
Interest Income Recognized
Interest Income Recognized, Total	249	634	511	1,141
Multi-family
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded					0
Recorded Investment Net of Charge Offs, With an allowance recorded					0
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded					0
Unpaid Principal Balance, With an allowance recorded					0
Related Allowance					0
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded		0		220
Average Recorded Investment, With an allowance recorded		390		260
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded		0		0
Interest Income Recognized, With an allowance recorded		5		10
Commercial and industrial
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	7,256		7,256		2,396
Recorded Investment Net of Charge Offs, With an allowance recorded	2,865		2,865		6,120
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	7,318		7,318		3,430
Unpaid Principal Balance, With an allowance recorded	2,865		2,865		6,120
Related Allowance	1,959		1,959		1,024
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	6,678	19,892	5,251	17,280
Average Recorded Investment, With an allowance recorded	7,209	8,034	6,846	7,211
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	46	286	96	473
Interest Income Recognized, With an allowance recorded	0	41	22	112
Commercial real estate - owner occupied
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	1,819		1,819		1,210
Recorded Investment Net of Charge Offs, With an allowance recorded	830		830		840
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	1,819		1,819		1,210
Unpaid Principal Balance, With an allowance recorded	830		830		840
Related Allowance	642		642		287
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	1,739	9,882	1,563	9,360
Average Recorded Investment, With an allowance recorded	839	6	839	8
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	0	108	3	202
Interest Income Recognized, With an allowance recorded	1	0	2	0
Commercial real estate - non-owner occupied
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	183		183		2,002
Recorded Investment Net of Charge Offs, With an allowance recorded	102		102		149
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	296		296		2,114
Unpaid Principal Balance, With an allowance recorded	155		155		204
Related Allowance	67		67		14
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	884	4,755	1,257	4,595
Average Recorded Investment, With an allowance recorded	114	538	126	544
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	0	0	2	15
Interest Income Recognized, With an allowance recorded	0	2	0	4
Other
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	56		56		57
Recorded Investment Net of Charge Offs, With an allowance recorded					0
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	57		57		57
Unpaid Principal Balance, With an allowance recorded					0
Related Allowance					0
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	56	45	56	46
Average Recorded Investment, With an allowance recorded		27		48
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	0	0	0	0
Interest Income Recognized, With an allowance recorded		0		0
Residential real estate
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	2,999		2,999		6,682
Recorded Investment Net of Charge Offs, With an allowance recorded	5,003		5,003		290
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	3,180		3,180		6,749
Unpaid Principal Balance, With an allowance recorded	5,003		5,003		303
Related Allowance	118		118		35
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	2,660	4,013	4,001	4,119
Average Recorded Investment, With an allowance recorded	4,953	544	3,399	494
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	0	20	1	44
Interest Income Recognized, With an allowance recorded	45	0	84	0
Manufactured housing
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	10,146		10,146		9,665
Recorded Investment Net of Charge Offs, With an allowance recorded	228		228
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	10,146		10,146		$ 9,665
Unpaid Principal Balance, With an allowance recorded	228		228
Related Allowance	5		5
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	10,074	8,874	9,937	8,683
Average Recorded Investment, With an allowance recorded	216		144
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	152	$ 172	293	$ 281
Interest Income Recognized, With an allowance recorded	$ 5		$ 8

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