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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Sep. 30, 2018
Cash Transactions: |  |  |
Interest paid | $ 38,362 | $ 77,748 |
Income taxes paid, net | 433 | 620 |
Operating lease payments | 3,516 | 3,424 |
Noncash Transactions: |  |  |
Loans charged-off to the allowance for credit losses | 14,274 | 11,693 |
Loans foreclosed upon and transferred to other real estate owned | 139 | 1,800 |
Available-for-sale securities transferred to held-to-maturity portfolio | 0 | 873,613 | $ 179,800
Right of use assets recognized during the period in exchange for lease obligations | $ 531 | $ 716 |

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