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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2013 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2013 | Dec. 31, 2018 | Dec. 31, 2017
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Maturity period of highly liquid debt instruments |  | three months |  |  |  |
Available-for-sale securities transferred to held-to-maturity securities | $ 536,000,000.0 |  |  | $ 536,000,000.0 |  |
Unrealized net loss on securities reclassified from available-for-sale to held-to-maturity, Gross | $ 13,300,000 |  |  | $ 13,300,000 |  |
Loans past due, minimum period |  | 90 days |  |  |  |
Impaired loans on non-accrual commercial real estate, multi-family, land, construction, commercial and industrial loans |  | $ 250,000 | $ 250,000 |  |  |
Interest and dividends receivable |  | 35,269,000 | 21,674,000 |  |  |
Accrued interest, before allowance for credit loss |  | 8,000,000.0 |  |  |  |
Stockholders’ equity |  | (1,484,130,000) | (1,153,119,000) |  | $ (1,039,358,000) | $ (601,941,000)
Purchased credit impaired (“PCI”) loans |  |  | 13,300,000 |  |  |
Effect of change in method |  | $ 3,200,000 |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Stockholders’ equity |  |  | 4,000 |  |  | $ 0
Computer Equipment |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated depreciable life of assets (years) |  | 3 years |  |  |  |
Furniture, Fixtures and Other Electronic Equipment |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated depreciable life of assets (years) |  | 5 years |  |  |  |
Building Improvements |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated depreciable life of assets (years) |  | 10 years |  |  |  |
Buildings |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated depreciable life of assets (years) |  | 30 years |  |  |  |
Accounting Standards Update 2016-13 |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
allowance for credit loss, period increase (decrease) |  | $ 475,000 |  |  |  |
Debt securities, held-to-maturity, allowance for credit loss, period increase (decrease) |  | 1,300,000 |  |  |  |
Off-Balance sheet, credit loss |  | $ 788,000 |  |  |  |
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Stockholders’ equity |  |  | $ 4,000 |  |  |

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