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Other Borrowings - Summary of Short-term Credit Lines Available for Use (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Available Federal Funds Line |  |  |
Debt Instrument [Line Items] |  |  |
Short-term credit lines available for use | [1] | $ 115,000 | $ 115,000
Federal Reserve Bank of Chicago Discount Window Line |  |  |
Debt Instrument [Line Items] |  |  |
Short-term credit lines available for use |  | 968,693 | 547,798
Federal Home Loan Bank Line |  |  |
Debt Instrument [Line Items] |  |  |
Short-term credit lines available for use |  | $ 1,999,298 | $ 1,390,698
[1] | The Company did not have an outstanding balance on its federal funds lines as of September 30, 2020 and December 31, 2019.

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- Details
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