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Loans Receivable and Allowance for Loan Losses - Schedule of Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 38,288	$ 38,458	$ 38,015	$ 37,315
Charge-offs	(527)	(2,585)	(2,377)	(5,576)
Recoveries	56	89	846	638
Provision for loan losses	2,924	2,352	4,257	5,937
Ending balance	40,741	38,314	40,741	38,314
Loans:
Individually evaluated for impairment					$ 35,260	$ 38,435
Collectively evaluated for impairment					7,185,027	6,702,825
Loans receivable, at amortized cost or lower of cost or market					7,242,995	6,768,175
Allowance for loan losses:
Individually evaluated for impairment					1,771	1,451
Collectively evaluated for impairment					35,773	32,537
Total Allowance for loan losses	38,288	38,458	38,015	37,315	40,741	38,015
Purchased Credit Impaired Loans
Loans:
Loans acquired with credit deterioration					22,708	26,915
Allowance for loan losses:
Loans acquired with credit deterioration					3,197	4,027
Multi-family
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	12,069	12,028	12,168	11,602
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for loan losses	(240)	668	(339)	1,094
Ending balance	11,829	12,696	11,829	12,696
Loans:
Individually evaluated for impairment					1,343	0
Collectively evaluated for impairment					3,501,450	3,500,500
Allowance for loan losses:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					11,829	12,168
Total Allowance for loan losses	12,069	12,028	12,168	11,602	11,829	12,168
Multi-family | Purchased Credit Impaired Loans
Loans:
Loans acquired with credit deterioration					1,747	1,881
Allowance for loan losses:
Loans acquired with credit deterioration					0	0
Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	12,258	11,585	10,918	11,050
Charge-offs	(90)	(2,032)	(314)	(4,079)
Recoveries	30	54	205	337
Provision for loan losses	516	966	1,905	3,265
Ending balance	12,714	10,573	12,714	10,573
Loans:
Individually evaluated for impairment					13,353	17,461
Collectively evaluated for impairment					1,272,165	1,130,865
Allowance for loan losses:
Individually evaluated for impairment					1,381	650
Collectively evaluated for impairment					10,881	9,804
Total Allowance for loan losses	12,258	11,585	10,918	11,050	12,714	10,918
Commercial and industrial | Purchased Credit Impaired Loans
Loans:
Loans acquired with credit deterioration					572	764
Allowance for loan losses:
Loans acquired with credit deterioration					452	464
Commercial real estate owner occupied
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,988	2,976	3,232	2,183
Charge-offs	0	0	(501)	0
Recoveries	0	0	326	9
Provision for loan losses	164	262	95	1,046
Ending balance	3,152	3,238	3,152	3,238
Loans:
Individually evaluated for impairment					1,335	1,448
Collectively evaluated for impairment					545,610	472,708
Allowance for loan losses:
Individually evaluated for impairment					80	642
Collectively evaluated for impairment					3,072	2,580
Total Allowance for loan losses	2,988	2,976	3,232	2,183	3,152	3,232
Commercial real estate owner occupied | Purchased Credit Impaired Loans
Loans:
Loans acquired with credit deterioration					8,669	10,572
Allowance for loan losses:
Loans acquired with credit deterioration					0	10
Commercial real estate non-owner occupied
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	6,698	7,786	7,437	7,894
Charge-offs	0	(77)	0	(485)
Recoveries	5	0	5	0
Provision for loan losses	(254)	(53)	(993)	247
Ending balance	6,449	7,656	6,449	7,656
Loans:
Individually evaluated for impairment					158	160
Collectively evaluated for impairment					1,153,107	1,213,309
Allowance for loan losses:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					4,298	4,630
Total Allowance for loan losses	6,698	7,786	7,437	7,894	6,449	7,437
Commercial real estate non-owner occupied | Purchased Credit Impaired Loans
Loans:
Loans acquired with credit deterioration					4,584	5,250
Allowance for loan losses:
Loans acquired with credit deterioration					2,151	2,807
Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	992	716	979	840
Charge-offs	0	0	0	0
Recoveries	11	27	231	157
Provision for loan losses	59	104	(148)	(150)
Ending balance	1,062	847	1,062	847
Loans:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					95,250	85,393
Allowance for loan losses:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					1,062	979
Total Allowance for loan losses	992	716	979	840	1,062	979
Construction | Purchased Credit Impaired Loans
Loans:
Loans acquired with credit deterioration					0	0
Allowance for loan losses:
Loans acquired with credit deterioration					0	0
Residential real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,908	2,995	2,929	3,342
Charge-offs	0	(120)	(407)	(410)
Recoveries	6	7	69	34
Provision for loan losses	987	72	1,310	(12)
Ending balance	3,901	2,954	3,901	2,954
Loans:
Individually evaluated for impairment					8,581	9,247
Collectively evaluated for impairment					496,473	219,162
Allowance for loan losses:
Individually evaluated for impairment					306	155
Collectively evaluated for impairment					3,072	2,177
Total Allowance for loan losses	2,908	2,995	2,929	3,342	3,901	2,929
Residential real estate | Purchased Credit Impaired Loans
Loans:
Loans acquired with credit deterioration					4,799	5,681
Allowance for loan losses:
Loans acquired with credit deterioration					523	597
Manufactured housing
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	149	268	180	286
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for loan losses	(55)	(77)	(86)	(95)
Ending balance	94	191	94	191
Loans:
Individually evaluated for impairment					10,378	10,089
Collectively evaluated for impairment					70,095	77,587
Allowance for loan losses:
Individually evaluated for impairment					4	4
Collectively evaluated for impairment					88	82
Total Allowance for loan losses	149	268	180	286	94	180
Manufactured housing | Purchased Credit Impaired Loans
Loans:
Loans acquired with credit deterioration					2,116	2,551
Allowance for loan losses:
Loans acquired with credit deterioration					2	94
Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	226	104	172	118
Charge-offs	(437)	(356)	(1,155)	(602)
Recoveries	4	1	10	101
Provision for loan losses	1,747	410	2,513	542
Ending balance	1,540	159	1,540	159
Loans:
Individually evaluated for impairment					112	30
Collectively evaluated for impairment					50,877	3,301
Allowance for loan losses:
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					1,471	117
Total Allowance for loan losses	$ 226	$ 104	$ 172	$ 118	1,540	172
Other | Purchased Credit Impaired Loans
Loans:
Loans acquired with credit deterioration					221	216
Allowance for loan losses:
Loans acquired with credit deterioration					$ 69	$ 55

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