Other Borrowings - Summary of Short-term Credit Lines Available for Use (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Federal Home Loan Bank Line
Debt Instrument [Line Items]
Short-term credit lines available for use	$ 2,040,248	$ 1,883,349
Federal Reserve Bank of Chicago Discount Window Line
Debt Instrument [Line Items]
Short-term credit lines available for use	747,988	602,962
Available Federal Funds Line
Debt Instrument [Line Items]
Short-term credit lines available for use	$ 115,000	$ 115,000