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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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Recorded Investment Net of Charge-offs
Recorded Investment Net of Charge Offs, Total	$ 35,260		$ 35,260		$ 38,435
Unpaid Principal Balance
Unpaid Principal Balance, Total	36,627		36,627		39,089
Related Allowance	1,771		1,771		1,451
Average Recorded Investment
Average Recorded Investment, Total	36,445	$ 36,846	36,446	$ 35,614
Interest Income Recognized
Interest Income Recognized, Total	435	750	815	1,261
Multi-family
Recorded Investment Net of Charge-offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	1,343		1,343
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	1,343		1,343
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	1,343		672
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	0		8
Commercial and industrial
Recorded Investment Net of Charge-offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	9,888		9,888		9,138
Recorded Investment Net of Charge Offs, With an allowance recorded	3,465		3,465		8,323
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	10,224		10,224		9,287
Unpaid Principal Balance, With an allowance recorded	3,648		3,648		8,506
Related Allowance	1,381		1,381		650
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	7,765	13,345	7,623	8,796
Average Recorded Investment, With an allowance recorded	5,787	1,963	7,089	5,400
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	166	354	168	450
Interest Income Recognized, With an allowance recorded	27	0	39	22
Commercial real estate owner occupied
Recorded Investment Net of Charge-offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	704		704		806
Recorded Investment Net of Charge Offs, With an allowance recorded	631		631		642
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	1,187		1,187		806
Unpaid Principal Balance, With an allowance recorded	631		631		642
Related Allowance	80		80		642
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	711	1,744	711	1,589
Average Recorded Investment, With an allowance recorded	336	1,056	546	950
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	0	15	0	18
Interest Income Recognized, With an allowance recorded	9	1	11	3
Commercial real estate non-owner occupied
Recorded Investment Net of Charge-offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	158		158		160
Recorded Investment Net of Charge Offs, With an allowance recorded					0
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	271		271		272
Unpaid Principal Balance, With an allowance recorded					0
Related Allowance					0
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	1,347	184	774	989
Average Recorded Investment, With an allowance recorded		51		94
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	0	91	8	93
Interest Income Recognized, With an allowance recorded		0		0
Other
Recorded Investment Net of Charge-offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	112		112		30
Recorded Investment Net of Charge Offs, With an allowance recorded					0
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	112		112		30
Unpaid Principal Balance, With an allowance recorded					0
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	103	44	83	50
Average Recorded Investment, With an allowance recorded		12		6
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	1	0	1	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	4,259		4,259		3,628
Recorded Investment Net of Charge Offs, With an allowance recorded	4,322		4,322		5,619
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	4,504		4,504		3,801
Unpaid Principal Balance, With an allowance recorded	4,329		4,329		5,656
Related Allowance	306		306		155
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	4,281	5,228	3,952	4,865
Average Recorded Investment, With an allowance recorded	4,398	2,862	4,760	2,729
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	23	125	25	126
Interest Income Recognized, With an allowance recorded	61	0	124	84
Manufactured housing
Recorded Investment Net of Charge-offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	10,152		10,152		9,865
Recorded Investment Net of Charge Offs, With an allowance recorded	226		226		224
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	10,152		10,152		9,865
Unpaid Principal Balance, With an allowance recorded	226		226		224
Related Allowance	4		4		$ 4
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	10,147	10,243	10,011	10,038
Average Recorded Investment, With an allowance recorded	227	114	225	108
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	144	164	421	457
Interest Income Recognized, With an allowance recorded	$ 4	$ 0	$ 10	$ 8

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