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Loans and Leases Receivable and Allowance for Credit Losses - Non-Covered Loans and Covered Loans by Class and Performance Status (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | $ 111,379 | $ 111,379 | $ 35,123
Non-accrual | 49,034 | 49,034 | 20,021
Loans and leases not past due | 7,241,883 | 7,241,883 | 7,244,271
Loans and lease receivable, gross | 7,353,262 | $ 7,353,262 | 7,318,988
Purchased-credit-impaired loans | 16,600 |  | 17,488
Financing receivable, at amortized cost or lower of cost or market |  |  | 7,316,903
Delinquent period |  | 30 days |
30 to 59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 52,717 | $ 52,717 |
60 to 89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 6,385 | 6,385 |
30-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  |  | 33,329
90 Days or More Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 52,277 | 52,277 | 1,794
Multi-family |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 6,399 | 6,399 | 2,133
Non-accrual | 4,020 | 4,020 | 4,117
Loans and leases not past due | 1,615,234 | 1,615,234 | 1,901,336
Loans and lease receivable, gross | 1,621,633 | 1,621,633 | 1,909,274
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 | 2,378 | 2,378 |
Multi-family | 60 to 89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 0 | 0 |
Multi-family | 30-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  |  | 2,133
Multi-family | 90 Days or More Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 4,021 | 4,021 | 0
Commercial and industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 12,173 | 12,173 | 2,395
Non-accrual | 9,993 | 9,993 | 4,531
Loans and leases not past due | 2,060,779 | 2,060,779 | 1,882,700
Loans and lease receivable, gross | 2,072,952 | 2,072,952 | 1,889,980
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 | 1,332 | 1,332 |
Commercial and industrial | 60 to 89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 659 | 659 |
Commercial and industrial | 30-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  |  | 2,395
Commercial and industrial | 90 Days or More Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 10,182 | 10,182 | 0
Commercial real estate owner occupied |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 8,102 | 8,102 | 5,388
Non-accrual | 2,411 | 2,411 | 1,963
Loans and leases not past due | 535,843 | 535,843 | 537,992
Loans and lease receivable, gross | 543,945 | 543,945 | 552,007
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 | 4,391 | 4,391 |
Commercial real estate owner occupied | 60 to 89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 971 | 971 |
Commercial real estate owner occupied | 30-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  |  | 5,388
Commercial real estate owner occupied | 90 Days or More Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 2,740 | 2,740 | 0
Commercial real estate non-owner occupied |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 52,193 | 52,193 | 8,034
Non-accrual | 21,479 | 21,479 | 76
Loans and leases not past due | 1,200,633 | 1,200,633 | 1,211,892
Loans and lease receivable, gross | 1,252,826 | 1,252,826 | 1,223,529
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 | 30,723 | 30,723 |
Commercial real estate non-owner occupied | 60 to 89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 0 | 0 |
Commercial real estate non-owner occupied | 30-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  |  | 8,034
Commercial real estate non-owner occupied | 90 Days or More Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 21,470 | 21,470 | 0
Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 0 | 0 | 0
Non-accrual | 0 | 0 | 0
Loans and leases not past due | 115,448 | 115,448 | 118,418
Loans and lease receivable, gross | 115,448 | 115,448 | 118,418
Purchased-credit-impaired loans |  |  | 0
Construction | 30 to 59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 0 | 0 |
Construction | 60 to 89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 0 | 0 |
Construction | 30-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  |  | 0
Construction | 90 Days or More Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 0 | 0 | 0
Residential real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 11,569 | 11,569 | 5,924
Non-accrual | 6,054 | 6,054 | 6,128
Loans and leases not past due | 350,478 | 350,478 | 359,491
Loans and lease receivable, gross | 362,047 | 362,047 | 375,014
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 | 5,253 | 5,253 |
Residential real estate | 60 to 89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 68 | 68 |
Residential real estate | 30-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  |  | 5,924
Residential real estate | 90 Days or More Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 6,248 | 6,248 | 0
Manufactured housing |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 8,189 | 8,189 | 5,493
Non-accrual | 2,558 | 2,558 | 1,655
Loans and leases not past due | 61,051 | 61,051 | 61,649
Loans and lease receivable, gross | 69,240 | 69,240 | 70,398
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 | 2,138 | 2,138 |
Manufactured housing | 60 to 89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 962 | 962 |
Manufactured housing | 30-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  |  | 3,699
Manufactured housing | 90 Days or More Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 5,089 | 5,089 | 1,794
Other consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 12,754 | 12,754 | 5,756
Non-accrual | 2,519 | 2,519 | 1,551
Loans and leases not past due | 1,302,417 | 1,302,417 | 1,170,793
Loans and lease receivable, gross | 1,315,171 | 1,315,171 | 1,178,283
Purchased-credit-impaired loans |  |  | 183
Other consumer | 30 to 59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 6,502 | 6,502 |
Other consumer | 60 to 89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 3,725 | 3,725 |
Other consumer | 30-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  |  | 5,756
Other consumer | 90 Days or More Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | $ 2,527 | $ 2,527 | $ 0

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