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Loans and Leases Receivable and Allowance for Credit Losses - Loans by Class and Performance Status (Detail) - USD ($) $ in Thousands			12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	$ 62,045		$ 62,045	$ 35,123
Non-Accrual	52,039		52,039	20,021
Loans and leases not past due	7,513,323		7,513,323	7,244,271
Purchased-credit-impaired loans	13,400	$ 13,400
Total loans and leases	7,575,368		$ 7,575,368	7,318,988
Total loans and leases				7,316,903
Delinquent period			30 days
Loans receivable, PPP	4,561,365		$ 4,561,365	0
Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased-credit-impaired loans				17,488
30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	21,633		21,633
60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	13,812		13,812
30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing				33,329
90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	26,600		26,600	1,794
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	24,324		24,324	2,133
Non-Accrual	21,728		21,728	4,117
Loans and leases not past due	1,736,977		1,736,977	1,901,336
Total loans and leases	1,761,301		1,761,301
Total loans and leases				1,909,274
Multi-family | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased-credit-impaired loans				1,688
Multi-family | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	4,193		4,193
Multi-family | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	5,224		5,224
Multi-family | 30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing				2,133
Multi-family | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	14,907		14,907	0
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	6,610		6,610	2,395
Non-Accrual	8,453		8,453	4,531
Loans and leases not past due	2,282,831		2,282,831	1,882,700
Total loans and leases	2,289,441		2,289,441
Total loans and leases				1,889,980
Commercial and industrial | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased-credit-impaired loans				354
Commercial and industrial | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	2,257		2,257
Commercial and industrial | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	1,274		1,274
Commercial and industrial | 30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing				2,395
Commercial and industrial | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	3,079		3,079	0
Commercial real estate owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	4,558		4,558	5,388
Non-Accrual	3,411		3,411	1,963
Loans and leases not past due	567,780		567,780	537,992
Total loans and leases	572,338		572,338
Total loans and leases				552,007
Commercial real estate owner occupied | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased-credit-impaired loans				6,664
Commercial real estate owner occupied | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	864		864
Commercial real estate owner occupied | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	1,324		1,324
Commercial real estate owner occupied | 30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing				5,388
Commercial real estate owner occupied | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	2,370		2,370	0
Commercial real estate non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	2,416		2,416	8,034
Non-Accrual	2,356		2,356	76
Loans and leases not past due	1,194,148		1,194,148	1,211,892
Total loans and leases	1,196,564		1,196,564
Total loans and leases				1,223,529
Commercial real estate non-owner occupied | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased-credit-impaired loans				3,527
Commercial real estate non-owner occupied | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0		0
Commercial real estate non-owner occupied | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	60		60
Commercial real estate non-owner occupied | 30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing				8,034
Commercial real estate non-owner occupied | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	2,356		2,356	0
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0		0	0
Non-Accrual				0
Loans and leases not past due	140,905		140,905	118,418
Total loans and leases	140,905		140,905
Total loans and leases				118,418
Construction | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased-credit-impaired loans				0
Construction | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0		0
Construction | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0		0
Construction | 30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing				0
Construction | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0		0	0
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	10,323		10,323	5,924
Non-Accrual	9,911		9,911	6,128
Loans and leases not past due	306,847		306,847	359,491
Total loans and leases	317,170		317,170
Total loans and leases				375,014
Residential real estate | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased-credit-impaired loans				3,471
Residential real estate | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	6,640		6,640
Residential real estate | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	1,827		1,827
Residential real estate | 30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing				5,924
Residential real estate | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	1,856		1,856	0
Manufactured housing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	4,142		4,142	5,493
Non-Accrual	2,969		2,969	1,655
Loans and leases not past due	58,101		58,101	61,649
Total loans and leases	62,243		62,243
Total loans and leases				70,398
Manufactured housing | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased-credit-impaired loans				1,601
Manufactured housing | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	1,518		1,518
Manufactured housing | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	673		673
Manufactured housing | 30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing				3,699
Manufactured housing | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	1,951		1,951	1,794
Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	9,672		9,672	5,756
Non-Accrual	3,211		3,211	1,551
Loans and leases not past due	1,225,734		1,225,734	1,170,793
Total loans and leases	1,235,406		1,235,406
Total loans and leases				1,178,283
Installment | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased-credit-impaired loans				183
Installment | 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	6,161		6,161
Installment | 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	3,430		3,430
Installment | 30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing				5,756
Installment | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	$ 81		$ 81	$ 0

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