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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 01, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2020 | Sep. 30, 2019
Cash Transactions: |  |  |  |  |  |  |  |
Interest paid |  |  |  |  | $ 179,163 |  | $ 216,261 |
Income taxes paid, net |  |  |  |  | 89,858 |  | 61,238 |
Operating lease payments |  |  |  |  | 10,077 |  | 10,193 |
Noncash Transactions: |  |  |  |  |  |  |  |
Loans charged-off to the allowance for credit losses |  | $ 15,029 | $ 6,780 |  | 35,724 |  | 21,328 |
Loans foreclosed upon and transferred to other real estate owned |  |  |  |  | 3,435 |  | 16,870 |
Loans foreclosed upon and transferred to other assets |  |  |  |  | 25 |  | 93 |
Fixed assets transferred to other real estate owned |  |  |  |  | 0 |  | 5,126 |
Available-for-sale securities transferred to held-to-maturity portfolio |  |  |  | $ 179,800 | 873,613 |  | 0 |
Right of use assets recognized during the period in exchange for lease obligations | $ 79,900 |  |  |  | $ 5,269 | [1] | $ 82,856 | [1]
[1] | (1) Includes $79.9 million recognized upon initial adoption of ASU 2016-02 on January 1, 2019.

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