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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2018 | Sep. 30, 2021 | Sep. 30, 2020
Cash Transactions: |  |  |  |  |  |
Interest paid |  |  |  |  | $ 90,651 | $ 179,163
Income taxes paid, net |  |  |  |  | 88,614 | 89,858
Operating lease payments |  |  |  |  | 10,878 | 10,077
Noncash Transactions: |  |  |  |  |  |
Loans charged-off to the allowance for credit losses | $ 12,289 | $ 15,029 |  |  | 39,319 | 35,724
Loans foreclosed upon and transferred to other real estate owned |  |  |  |  | 798 | 3,435
Loans foreclosed upon and transferred to other assets |  |  |  |  | 0 | 25
Available-for-sale securities transferred to held-to-maturity portfolio |  |  | $ 873,600 | $ 179,800 | 0 | 873,613
Right of use assets recognized during the period in exchange for lease obligations |  |  |  |  | $ 8,745 | $ 5,269

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- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 + Details
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