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Loans and Allowance for Credit Losses Activity in the Allowance for Credit Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | $ 291,940 | $ 166,209 | $ 166,209
Loans charged off | 8,202 | 14,003 |
Recoveries of loans previously charged off | 2,021 | 2,887 |
Total net (charge-offs) recoveries | (6,181) | (11,116) |
Provision for credit losses | (5,500) | 44,029 |
Ending balance | 280,259 | 257,471 | 291,940
Cumulative Effect, Period of Adoption, Adjustment |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 0 | 58,349 | 58,349
Ending balance |  |  | $ 0
Off-Balance Sheet |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Provision for credit losses | $ 100 | $ (3,800) |

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