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Investment Securities - Textuals (Details) - USD ($) | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Summary of Investment Holdings [Line Items] |  |  |
Securities classified as trading | $ 0 |  | $ 0
Debt Securities, Held-to-maturity | 0 |  | 0
Allowance for credit losses on loans | 70,185,000 | $ 37,993,000 | 36,171,000
Accrued Investment Income Receivable | 3,600,000 |  | 3,700,000
Available-for-sale Securities [Member] |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Allowance for credit losses on loans | $ 0 |  | $ 0

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