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Authoritative Accounting Guidance (Narrative) (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually evaluated loans | $ 81,280,000 | $ 80,550,000
Collectively evaluated loans | 6,197,084,000 | $ 5,192,274,000
Financial Asset Acquired with Credit Deterioration [Member] | Maximum [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually evaluated loans | 250,000 |
Financial Asset Acquired with Credit Deterioration [Member] | Minimum [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Collectively evaluated loans | $ 250,000 |

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