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Significant Accounting Policies and Basis of Presentation - Impact of ASC 326 (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2020 | Jan. 01, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans receivable, mortgage warehouse, at fair value | $ 3,913,593 | $ 2,245,758 |  |  |  |  |
Loans and leases receivable | 7,700,892 | 7,318,988 |  |  |  |  |
Allowance for credit losses on loans and leases | (155,561) | (56,379) | $ (159,905) | $ (136,200) | $ (51,053) | $ (48,388) | $ (39,972)
Total loans and leases receivable, net of allowance for credit losses | 16,423,029 | 9,508,367 |  |  |  |  |
Liabilities: |  |  |  |  |  |  |
Allowance for credit losses on lending-related commitments |  | 49 |  |  |  |  |
Net deferred tax (asset) liability |  | 11,740 |  |  |  |  |
Equity |  |  |  |  |  |  |
Retained earnings | $ 385,750 | 381,519 |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans receivable, mortgage warehouse, at fair value |  |  |  | 0 |  |  |
Loans and leases receivable |  |  |  | 232 |  |  |
Allowance for credit losses on loans and leases |  | (79,829) |  | (79,829) |  |  |
Total loans and leases receivable, net of allowance for credit losses |  |  |  | (79,596) |  |  |
Liabilities: |  |  |  |  |  |  |
Allowance for credit losses on lending-related commitments |  |  |  | 3,388 |  |  |
Net deferred tax (asset) liability |  |  |  | (21,510) |  |  |
Equity |  |  |  |  |  |  |
Retained earnings |  |  |  | (61,475) |  |  |
Cumulative Effect, Period Of Adoption, Adjusted Balance |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans receivable, mortgage warehouse, at fair value |  |  |  | 2,245,758 |  |  |
Loans and leases receivable |  |  |  | 7,319,220 |  |  |
Allowance for credit losses on loans and leases |  |  |  | (136,208) |  |  |
Total loans and leases receivable, net of allowance for credit losses |  |  |  | 9,428,771 |  |  |
Liabilities: |  |  |  |  |  |  |
Allowance for credit losses on lending-related commitments |  |  |  | 3,437 |  |  |
Net deferred tax (asset) liability |  |  |  | (9,770) |  |  |
Equity |  |  |  |  |  |  |
Retained earnings |  |  |  | 320,044 |  |  |
Commercial Portfolio Segment |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  | 5,690,820 |  |  |  |  |
Commercial Portfolio Segment | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  |  |  | 151 |  |  |
Commercial Portfolio Segment | Cumulative Effect, Period Of Adoption, Adjusted Balance |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  |  |  | 5,690,971 |  |  |
Commercial Portfolio Segment | Multi-family |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  | 1,907,331 |  |  |  |  |
Commercial Portfolio Segment | Multi-family | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  |  |  | 7 |  |  |
Commercial Portfolio Segment | Multi-family | Cumulative Effect, Period Of Adoption, Adjusted Balance |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  |  |  | 1,907,338 |  |  |
Commercial Portfolio Segment | Commercial and industrial |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  | 1,891,152 |  |  |  |  |
Commercial Portfolio Segment | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  |  |  | 3 |  |  |
Commercial Portfolio Segment | Commercial and industrial | Cumulative Effect, Period Of Adoption, Adjusted Balance |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  |  |  | 1,891,155 |  |  |
Commercial Portfolio Segment | Commercial real estate owner occupied |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  | 551,948 |  |  |  |  |
Commercial Portfolio Segment | Commercial real estate owner occupied | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  |  |  | 100 |  |  |
Commercial Portfolio Segment | Commercial real estate owner occupied | Cumulative Effect, Period Of Adoption, Adjusted Balance |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  |  |  | 552,048 |  |  |
Commercial Portfolio Segment | Commercial real estate non-owner occupied |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  | 1,222,772 |  |  |  |  |
Commercial Portfolio Segment | Commercial real estate non-owner occupied | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  |  |  | 41 |  |  |
Commercial Portfolio Segment | Commercial real estate non-owner occupied | Cumulative Effect, Period Of Adoption, Adjusted Balance |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  |  |  | 1,222,813 |  |  |
Commercial Portfolio Segment | Construction |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  | 117,617 |  |  |  |  |
Commercial Portfolio Segment | Construction | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  |  |  | 0 |  |  |
Commercial Portfolio Segment | Construction | Cumulative Effect, Period Of Adoption, Adjusted Balance |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  |  |  | 117,617 |  |  |
Consumer Portfolio Segment |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  | 1,628,168 |  |  |  |  |
Consumer Portfolio Segment | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  |  |  | 81 |  |  |
Consumer Portfolio Segment | Cumulative Effect, Period Of Adoption, Adjusted Balance |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  |  |  | 1,628,249 |  |  |
Consumer Portfolio Segment | Residential real estate |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  | 382,634 |  |  |  |  |
Consumer Portfolio Segment | Residential real estate | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  |  |  | 32 |  |  |
Consumer Portfolio Segment | Residential real estate | Cumulative Effect, Period Of Adoption, Adjusted Balance |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  |  |  | 382,666 |  |  |
Consumer Portfolio Segment | Manufactured housing |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  | 71,359 |  |  |  |  |
Consumer Portfolio Segment | Manufactured housing | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  |  |  | 37 |  |  |
Consumer Portfolio Segment | Manufactured housing | Cumulative Effect, Period Of Adoption, Adjusted Balance |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  |  |  | 71,396 |  |  |
Consumer Portfolio Segment | Installment |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  | $ 1,174,175 |  |  |  |  |
Consumer Portfolio Segment | Installment | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  |  |  | 12 |  |  |
Consumer Portfolio Segment | Installment | Cumulative Effect, Period Of Adoption, Adjusted Balance |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Loans and leases receivable |  |  |  | $ 1,174,187 |  |  |

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