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v3.24.0.1

Allowance for Loan Losses - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) SecurityLoan | Dec. 31, 2021 USD ($) SecurityLoan | Dec. 31, 2020 USD ($) | Jan. 01, 2023 USD ($)
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses |  | $ 37,160,000 | $ 28,511,000 |  |  |
Allowance for credit losses |  | 37,160,000 | 28,511,000 |  |  |
Provision for loan losses |  | $ 4,435,000 | 1,752,000 | $ 830,000 | $ 10,112,000 |
Number of days reaching where loans are considered for nonaccrual status |  | 90 days |  |  |  |
Conditions where loans are considered for nonaccrual status |  | A loan may be returned to accruing status only if one of three conditions are met: the loan is well-secured and none of the principal and interest has been past due for a minimum of 90 days; the loan is a TDR and the borrower has made a minimum of six months payments; or the principal and interest payments are reasonably assured and a sustained period of performance has occurred, generally six months. |  |  |  |
Gross interest income recorded on nonaccrual loans |  | $ 446,000 | 384,000 | 307,000 |  |
Interest income on nonaccrual loans recognized on cash basis |  | 343,000 | $ 451,000 | $ 716,000 |  |
Defaulted loans | SecurityLoan |  |  | 0 | 0 |  |
Foreclosed assets |  | 0 | $ 0 |  |  |
Residential mortgages in process of foreclosure |  | 1,018,000 | 399,000 |  |  |
Allowance for loan losses recorded for acquired loans |  | $ 0 | 0 |  |  |
Individually evaluated loans |  | greater than $350 |  |  |  |
Loans modified as troubled debt restructuring |  | $ 0 |  |  |  |
ASU 2016-13 [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  | $ 37,861,000
Allowance for credit losses |  |  | 897,000 |  |  |
CECL Loans [Member] | ASU 2016-13 [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  | $ 7,682,000
Allowance for credit losses |  |  | 4,296,000 |  |  |
Adjustment [Member] | ASU 2016-13 [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Increase allowance of credit loss | $ 897,000 |  |  |  |  |
Adjustment [Member] | CECL Loans [Member] | ASU 2016-13 [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Increase allowance of credit loss | $ 4,296,000 |  |  |  |  |
Civista Leasing And Finance [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Provision for loan losses |  | $ 452,000 |  |  |  |
TDRs [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses |  |  | $ 7,000 | $ 18,000 |  |

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