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Loans and Leases Receivable and Allowance for Credit Losses - Schedule of Loans and Leases Receivable (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable, mortgage warehouse, at fair value |  |  |  | $ 2,245,758 |  |  |
Loans receivable, PPP | $ 4,760,427 |  |  | 0 |  |  |
Loans and leases receivable | 7,272,447 |  |  | 7,318,988 |  |  |
Allowance for credit losses on loans and leases | (159,905) | $ (149,283) | $ (136,200) | (56,379) | $ (48,388) | $ (43,679) | $ (39,972)
Total loans and leases receivable, net of allowance for credit losses | 14,666,133 |  |  | 9,508,367 |  |  |
Deferred (fees) costs and unamortized (discounts) premiums, net | (83,100) |  |  | 2,100 |  |  |
Loans and leases receivable, mortgage warehouse, at fair value |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable, mortgage warehouse, at fair value | 2,793,164 |  |  | 2,245,758 |  |  |
Multi-family |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 1,581,839 |  |  | 1,909,274 |  |  |
Allowance for credit losses on loans and leases | (14,697) | (8,750) |  | (6,157) | (9,926) | (10,630) | (11,462)
Construction |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 128,834 |  |  | 118,418 |  |  |
Allowance for credit losses on loans and leases | (5,297) | (1,934) |  | (1,262) | (649) | (584) | (624)
Residential real estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 348,109 |  |  | 375,014 |  |  |
Allowance for credit losses on loans and leases | (4,550) | (4,180) |  | (3,218) | (4,168) | (6,572) | (3,654)
Manufactured housing |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 66,865 |  |  | 70,398 |  |  |
Allowance for credit losses on loans and leases | (6,014) | (4,987) |  | (1,060) | (123) | (117) | (145)
Other consumer |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 1,257,813 |  |  | 1,178,283 |  |  |
Allowance for credit losses on loans and leases | (79,147) | $ (83,569) |  | (20,648) | $ (10,267) | $ (3,689) | $ (2,529)
Commercial |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 5,599,660 |  |  | 5,690,820 |  |  |
Commercial | Multi-family |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 1,581,839 |  |  | 1,907,331 |  |  |
Commercial | Commercial and industrial |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 2,099,442 |  |  | 1,891,152 |  |  |
Commercial | Commercial real estate owner occupied |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 544,772 |  |  | 551,948 |  |  |
Commercial | Commercial real estate non-owner occupied |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 1,244,773 |  |  | 1,222,772 |  |  |
Commercial | Construction |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 128,834 |  |  | 117,617 |  |  |
Commercial | Direct Finance Equipment Leases |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 96,400 |  |  | 89,200 |  |  |
Consumer |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 1,672,787 |  |  | 1,628,168 |  |  |
Consumer | Residential real estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 348,109 |  |  | 382,634 |  |  |
Consumer | Manufactured housing |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 66,865 |  |  | 71,359 |  |  |
Consumer | Other consumer |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | $ 1,257,813 |  |  | $ 1,174,175 |  |  |

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