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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Aug. 01, 2021 USD ($) | Jun. 28, 2021 USD ($) loan | May 03, 2021 USD ($) borrower loan | Jun. 30, 2021 USD ($) store borrower | Jun. 30, 2021 USD ($) loan store borrower | Jun. 30, 2020 USD ($) loan | Dec. 31, 2020 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Number of contracts modified in TDR | loan |  |  |  |  | 0 | 0 |
PPP loans, net |  |  |  | $ 7,166,998 | $ 7,166,998 |  | $ 7,650,633
Proceeds from sale of SBA PPP loans |  |  |  |  | 169,778 | $ 0 |
Allowance for credit losses |  |  |  | 132 | $ 132 |  | $ 167
Subsequent Event | Subordinated Notes, 5.0% |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Repayments of debt | $ 150,000 |  |  |  |  |  |
PPP loans |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 1.00% |  |
PPP loans, net |  |  | $ 378,400 | $ 238,000 | $ 238,000 |  |
Number of borrowers | borrower |  |  | 789,000 | 537 | 537 |  |
Number of PPP loans sold | loan |  | 16 | 849 |  |  |  |
Proceeds from sale of SBA PPP loans |  | $ 816 | $ 169,000 | $ 169,800 |  |  |
PPP loans | Minimum |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Term of the loans granted |  |  |  |  | 2 years |  |
PPP loans | Maximum |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Term of the loans granted |  |  |  |  | 5 years |  |
Small Business Administration |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
PPP loans, net |  |  |  | 18,000 | $ 18,000 |  |
Decrease for debt forgiveness |  |  |  | $ 180,000 |  |  |
90 Days or More Past Due |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Number of contracts modified in TDR | loan |  |  |  |  | 0 |  |
Banking Services |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Number of locations | store |  |  |  | 19 | 19 |  |
Lending Centers |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Number of locations | store |  |  |  | 5 | 5 |  |

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