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Recent Accounting Pronouncements (Impact of ASC 326 in Balance Sheet as January 1, 2020) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans | $ 3,012,989 |  | $ 3,091,998 |  |  |  | $ 3,081,973
Allowance for Credit Losses | (37,798) | $ (39,995) | (46,859) | $ (46,768) | $ (42,431) | $ (31,931) | (16,278)
Allowance for Credit Losses on Unfunded Loan Commitments |  |  |  |  |  | (173) |
December 31, 2019 After Reclassification |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  |  |  |  | 3,081,973
Allowance for Credit Losses |  |  |  |  |  |  | (16,278)
Allowance for Credit Losses on Unfunded Loan Commitments |  |  |  |  |  |  | 0
Impact of ASC 326 Adoption |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  |  |  |  | 0
Allowance for Credit Losses |  |  |  |  |  | (15,653) |
Allowance for Credit Losses on Unfunded Loan Commitments |  |  |  |  |  | (173) |
Commercial and Industrial Loans |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans | 510,583 |  | 638,773 |  |  | 534,692 | 589,758
Allowance for Credit Losses | (8,054) | (6,080) | (6,445) | (7,700) | (8,787) |  | (4,799)
Commercial and Industrial Loans | December 31, 2019 After Reclassification |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  |  |  |  | 532,501
Commercial and Industrial Loans | Impact of ASC 326 Adoption |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  |  |  | 2,191 | (57,257)
Commercial Real Estate Loans |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans | 1,528,493 |  | 1,467,397 |  |  | 1,500,247 | 1,495,862
Allowance for Credit Losses | (21,392) | (24,220) | (29,878) | (28,382) | (22,369) |  | (4,692)
Commercial Real Estate Loans | December 31, 2019 After Reclassification |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  |  |  |  | 1,495,862
Commercial Real Estate Loans | Impact of ASC 326 Adoption |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  |  |  | 4,385 |
Agricultural Loans |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans | 349,321 |  | 376,186 |  |  | 384,654 | 384,526
Allowance for Credit Losses | (4,695) | (5,847) | (6,756) | (6,715) | (7,030) |  | (5,315)
Agricultural Loans | December 31, 2019 After Reclassification |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  |  |  |  | 384,526
Agricultural Loans | Impact of ASC 326 Adoption |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  |  |  | 128 |
Leases |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans | 56,186 |  | 55,664 |  |  | 57,257 |
Allowance for Credit Losses | (203) | (204) | (200) | (206) | (202) |  | 0
Leases | December 31, 2019 After Reclassification |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  |  |  |  | 57,257
Leases | Impact of ASC 326 Adoption |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  |  |  | 0 | 57,257
Home Equity Loans |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans | 217,994 |  | 219,348 |  |  | 225,790 | 225,755
Allowance for Credit Losses | (1,017) | (908) | (996) | (995) | (1,062) |  | (200)
Home Equity Loans | December 31, 2019 After Reclassification |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  |  |  |  | 225,755
Home Equity Loans | Impact of ASC 326 Adoption |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  |  |  | 35 |
Consumer Loans |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans | 67,150 |  | 66,717 |  |  | 69,264 | 81,217
Allowance for Credit Losses | (483) | (460) | (490) | (492) | (496) |  | (434)
Consumer Loans | December 31, 2019 After Reclassification |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  |  |  |  | 69,264
Consumer Loans | Impact of ASC 326 Adoption |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  |  |  | 0 | (11,953)
Credit Cards |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans | 13,856 |  | 11,637 |  |  | 11,953 |
Allowance for Credit Losses | (192) | (181) | (150) | (137) | (125) |  | 0
Credit Cards | December 31, 2019 After Reclassification |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  |  |  |  | 11,953
Credit Cards | Impact of ASC 326 Adoption |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  |  |  | 0 | 11,953
Residential Mortgage Loans |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans | 269,406 |  | 256,276 |  |  | 305,002 | 304,855
Allowance for Credit Losses | $ (1,762) | $ (2,095) | $ (1,944) | $ (2,141) | $ (2,360) |  | (333)
Residential Mortgage Loans | December 31, 2019 After Reclassification |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  |  |  |  | $ 304,855
Residential Mortgage Loans | Impact of ASC 326 Adoption |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  |  |  | $ 147 |

X
- 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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