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Loans (Retail Loans Based on Payment Activity) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | $ 3,091,998 |  | $ 3,081,973
Credit Cards |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 11,637 | $ 11,953 |
Credit Cards | Performing |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | 11,551 |  |
Credit Cards | Nonperforming |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans | $ 86 |  |

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