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Allowance for Credit Losses - Summary of Allowances for Loan Losses by Loan Class (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Beginning balance | $ 3,443 | $ 4,666 | $ 3,152
Charge-offs | (2) |  | (2)
Recoveries | 54 |  | 65
Provision for credit losses | 395 | (200) | 675
Ending balance | 3,890 | 10,228 | 3,890
Agriculture Loans [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Beginning balance | 20 | 33 | 23
Charge-offs | 0 |  | 0
Recoveries | 0 |  | 0
Provision for credit losses | (3) |  | (6)
Ending balance | 17 |  | 17
Commercial and PPP Loans [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Beginning balance | 585 | 583 | 582
Charge-offs | (1) |  | (1)
Recoveries | 5 |  | 7
Provision for credit losses | (83) |  | (82)
Ending balance | 506 |  | 506
Commercial Real Estate Loans [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Beginning balance | 1,070 | 2,462 | 799
Charge-offs | (1) |  | (1)
Recoveries | 0 |  | 0
Provision for credit losses | 717 |  | 988
Ending balance | 1,786 |  | 1,786
Residential Real Estate Loans [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Beginning balance | 1,728 | 1,536 | 1,634
Charge-offs | 0 |  | 0
Recoveries | 49 |  | 56
Provision for credit losses | (230) |  | (143)
Ending balance | 1,547 |  | 1,547
Consumer Loans [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Beginning balance | 13 | 40 | 22
Charge-offs | 0 |  | 0
Recoveries | 0 |  | 2
Provision for credit losses | 8 |  | (3)
Ending balance | 21 |  | 21
Municipal Loans [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Beginning balance | 15 | 12 | 15
Charge-offs | 0 |  | 0
Recoveries | 0 |  | 0
Provision for credit losses | (2) |  | (2)
Ending balance | 13 |  | 13
Unallocated [Member] |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Beginning balance | 12 | $ 0 | 77
Charge-offs | 0 |  | 0
Recoveries | 0 |  | 0
Provision for credit losses | (12) |  | (77)
Ending balance | $ 0 |  | $ 0

X
- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(4) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(3) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481696/310-30-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(1) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (g) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480418/310-10-S99-4 + Details
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