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Loans and Allowance for Credit Losses - Allowance for Credit Losses and Balances in Loan Portfolio (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | $ 7,619,000 | $ 7,688,000 |
Charge-offs | (140,000) | (143,000) |
Recoveries | 112,000 | 56,000 |
Provision | 309,000 | 0 |
Ending balance | 15,065,000 | 7,601,000 |
Individually evaluated for impairment |  | 548,000 | $ 153,000
Collectively evaluated for impairment |  | 7,053,000 | 7,466,000
Individually evaluated for credit loss | 52,000 |  |
Collectively evaluated for credit loss | 15,013,000 |  |
Individually evaluated for impairment |  | 4,940,000 | 2,846,000
Collectively evaluated for impairment |  | 1,006,826,000 | 1,172,662,000
Individually evaluated for credit loss | 2,151,000 |  |
Collectively evaluated for credit loss | 1,208,432,000 |  |
Acquired with deteriorated credit quality |  | 15,640,000 | 14,274,000
Loans | 1,210,583,000 | 1,027,406,000 | 1,189,782,000
Cumulative Effect of Change in Accounting Principle [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 7,165,000 |  |
Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 144,000 | 448,000 |
Charge-offs | 0 | 0 |
Recoveries | 0 | 0 |
Provision | (23,000) | (61,000) |
Ending balance | 135,000 | 387,000 |
Individually evaluated for impairment |  | 253,000 | 2,000
Collectively evaluated for impairment |  | 134,000 | 142,000
Individually evaluated for credit loss | 1,000 |  |
Collectively evaluated for credit loss | 134,000 |  |
Individually evaluated for impairment |  | 2,542,000 | 23,000
Collectively evaluated for impairment |  | 59,076,000 | 64,136,000
Individually evaluated for credit loss | 18,000 |  |
Collectively evaluated for credit loss | 55,977,000 |  |
Acquired with deteriorated credit quality |  | 0 | 0
Loans | 55,995,000 | 61,618,000 | 64,159,000
Agricultural [Member] | Cumulative Effect of Change in Accounting Principle [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 14,000 |  |
Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 1,361,000 | 1,454,000 |
Charge-offs | 0 | (31,000) |
Recoveries | 27,000 | 2,000 |
Provision | 45,000 | 327,000 |
Ending balance | 3,020,000 | 1,752,000 |
Individually evaluated for impairment |  | 116,000 | 14,000
Collectively evaluated for impairment |  | 1,636,000 | 1,347,000
Individually evaluated for credit loss | 7,000 |  |
Collectively evaluated for credit loss | 3,013,000 |  |
Individually evaluated for impairment |  | 356,000 | 177,000
Collectively evaluated for impairment |  | 194,024,000 | 206,074,000
Individually evaluated for credit loss | 180,000 |  |
Collectively evaluated for credit loss | 216,883,000 |  |
Acquired with deteriorated credit quality |  | 4,534,000 | 3,959,000
Loans | 217,063,000 | 198,914,000 | 210,210,000
Commercial and Industrial [Member] | Cumulative Effect of Change in Accounting Principle [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 1,587,000 |  |
Consumer Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 310,000 | 290,000 |
Charge-offs | (140,000) | (112,000) |
Recoveries | 69,000 | 52,000 |
Provision | 133,000 | 74,000 |
Ending balance | 913,000 | 304,000 |
Individually evaluated for impairment |  | 3,000 | 1,000
Collectively evaluated for impairment |  | 301,000 | 309,000
Individually evaluated for credit loss | 1,000 |  |
Collectively evaluated for credit loss | 912,000 |  |
Individually evaluated for impairment |  | 32,000 | 7,000
Collectively evaluated for impairment |  | 36,108,000 | 39,793,000
Individually evaluated for credit loss | 27,000 |  |
Collectively evaluated for credit loss | 38,864,000 |  |
Acquired with deteriorated credit quality |  | 11,000 | 8,000
Loans | 38,891,000 | 36,151,000 | 39,808,000
Consumer Portfolio Segment [Member] | Cumulative Effect of Change in Accounting Principle [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 541,000 |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 4,822,000 | 3,705,000 |
Charge-offs | 0 | 0 |
Recoveries | 13,000 | 1,000 |
Provision | (4,000) | (16,000) |
Ending balance | 7,837,000 | 3,690,000 |
Individually evaluated for impairment |  | 9,000 | 5,000
Collectively evaluated for impairment |  | 3,681,000 | 4,817,000
Individually evaluated for credit loss | 1,000 |  |
Collectively evaluated for credit loss | 7,836,000 |  |
Individually evaluated for impairment |  | 157,000 | 165,000
Collectively evaluated for impairment |  | 527,743,000 | 622,131,000
Individually evaluated for credit loss | 32,000 |  |
Collectively evaluated for credit loss | 648,170,000 |  |
Acquired with deteriorated credit quality |  | 9,352,000 | 8,657,000
Loans | 648,202,000 | 537,252,000 | 630,953,000
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect of Change in Accounting Principle [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 3,006,000 |  |
Construction Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 63,000 | 110,000 |
Charge-offs | 0 | 0 |
Recoveries | 0 | 0 |
Provision | (10,000) | (73,000) |
Ending balance | 73,000 | 37,000 |
Individually evaluated for impairment |  | 0 | 0
Collectively evaluated for impairment |  | 37,000 | 63,000
Individually evaluated for credit loss | 0 |  |
Collectively evaluated for credit loss | 73,000 |  |
Individually evaluated for impairment |  | 0 | 0
Collectively evaluated for impairment |  | 15,669,000 | 14,736,000
Individually evaluated for credit loss | 0 |  |
Collectively evaluated for credit loss | 13,939,000 |  |
Acquired with deteriorated credit quality |  | 0 | 0
Loans | 13,939,000 | 15,669,000 | 14,736,000
Construction Real Estate [Member] | Cumulative Effect of Change in Accounting Principle [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 20,000 |  |
Residential Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 906,000 | 671,000 |
Charge-offs | 0 | 0 |
Recoveries | 3,000 | 1,000 |
Provision | 168,000 | (83,000) |
Ending balance | 3,087,000 | 589,000 |
Individually evaluated for impairment |  | 167,000 | 131,000
Collectively evaluated for impairment |  | 422,000 | 775,000
Individually evaluated for credit loss | 42,000 |  |
Collectively evaluated for credit loss | 3,045,000 |  |
Individually evaluated for impairment |  | 1,853,000 | 2,474,000
Collectively evaluated for impairment |  | 174,206,000 | 225,792,000
Individually evaluated for credit loss | 1,894,000 |  |
Collectively evaluated for credit loss | 234,599,000 |  |
Acquired with deteriorated credit quality |  | 1,743,000 | 1,650,000
Loans | 236,493,000 | 177,802,000 | 229,916,000
Residential Portfolio Segment [Member] | Cumulative Effect of Change in Accounting Principle [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 2,010,000 |  |
Unallocated Financing Receivables [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | 13,000 | 1,010,000 |
Charge-offs | 0 | 0 |
Recoveries | 0 | 0 |
Provision | 0 | (168,000) |
Ending balance | 0 | 842,000 |
Individually evaluated for impairment |  | 0 | 0
Collectively evaluated for impairment |  | $ 842,000 | $ 13,000
Individually evaluated for credit loss | 0 |  |
Collectively evaluated for credit loss | 0 |  |
Unallocated Financing Receivables [Member] | Cumulative Effect of Change in Accounting Principle [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Beginning balance | $ (13,000) |  |

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