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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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