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Investment Securities - Textual (Details) - USD ($) | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | --- | ---
Allowance for credit losses on loans | $ 51,562,000 | $ 64,225,000 | $ 70,185,000 | $ 71,501,000 | $ 47,540,000 | $ 37,993,000 | $ 36,171,000
Accrued Investment Income Receivable | 4,200,000 |  | 3,600,000 |  |  |  |
Available-for-sale Securities [Member] |  |  |  |  |  |  |
Allowance for credit losses on loans | $ 0 |  | $ 0 |  |  |  |

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