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Authoritative Accounting Guidance (Narrative) (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually evaluated loans | $ 103,211,000 | $ 80,550,000
Collectively evaluated loans | 6,469,284,000 | $ 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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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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