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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020 | Sep. 30, 2018
Cash Transactions: |  |  |  |
Interest paid | $ 22,772 | $ 38,362 |  |
Income taxes paid, net | 625 | 433 |  |
Operating lease payments | 3,819 | 3,516 |  |
Noncash Transactions: |  |  |  |
Loans charged-off to the allowance for credit losses | 6,512 | 14,274 |  |
Loans foreclosed upon and transferred to other real estate owned | 0 | 139 |  |
Available-for-sale securities transferred to held-to-maturity portfolio | 1,059,737 | 0 | $ 873,600 | $ 179,800
Right of use assets recognized during the period in exchange for lease obligations | $ 1,528 | $ 531 |  |

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