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Loans - Changes in the Allowance for Losses (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 13,832,000 |
Provision for/(release of) losses | $ 366,000 | $ 653,000 | 518,000 | $ 4,542,000
Ending balance | 14,294,000 |  | 14,294,000 |
Farm & Ranch |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Beginning balance | 3,092,000 | 6,039,000 | 3,745,000 | 10,454,000
Provision for/(release of) losses | 414,000 | (300,000) | (239,000) | (412,000)
Charge-offs | 0 | 0 | 0 | (394,000)
Ending balance | 3,506,000 | 5,739,000 | 3,506,000 | 5,739,000
Farm & Ranch | Commercial Real Estate |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Provision for/(release of) losses |  |  | 0 | 1,800,000
Farm & Ranch | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Beginning balance | 0 | 0 | 0 | (3,909,000)
Farm & Ranch | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Beginning balance | 3,092,000 | 6,039,000 | 3,745,000 | 6,545,000
Rural Utilities |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Beginning balance | 10,908,000 | 8,900,000 | 10,087,000 | 0
Provision for/(release of) losses | (120,000) | 1,182,000 | 701,000 | 4,704,000
Charge-offs | 0 | 0 | 0 | 0
Ending balance | 10,788,000 | 10,082,000 | 10,788,000 | 10,082,000
Rural Utilities | Collateral Pledged |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Provision for/(release of) losses |  |  | 0 | 0
Rural Utilities | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Beginning balance | 0 | 0 | 0 | 5,378,000
Rural Utilities | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Beginning balance | $ 10,908,000 | $ 8,900,000 | $ 10,087,000 | $ 5,378,000

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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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- Definition Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (4) + Details
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- Definition Amount of credit loss expense (reversal of expense) for financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(11)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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