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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) Segment $ / shares | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jan. 01, 2023 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |
Allowance for credit losses | $ 37,160,000 | $ 28,511,000 |  |
Increase in allowance for credit losses | 4,300,000 |  |  |
Unfunded loan commitments | 3,400,000 |  |  |
Discount from loans to allowance for credit losses | 1,700,000 |  |  |
Increase in deferred tax assets | 1,600,000 |  |  |
Decrease to Retained Earnings | $ 183,788,000 | 156,492,000 |  |
Federal Home Loan Bank par value | $ / shares | $ 100 |  |  |
Reserve amount | $ 0 |  |  |
Number of operating segments | Segment | 1 |  |  |
Loans, net of allowance for loan losses | $ 2,824,568,000 | 2,619,770,000 |  |
Total loans | 13,158,000 | 9,253,000 |  |
Interest income | 182,734,000 | 126,155,000 | $ 105,054,000 |
Interest expense | 57,238,000 | 15,951,000 | 9,629,000 |
Other assets | 26,266,000 | 22,756,000 |  |
Subordinated debentures | 103,943,000 | 103,799,000 |  |
Revisions |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Loans, net of allowance for loan losses | $ 2,528,906,000 | 2,160,920,000 |  |
Interest income |  | 4,902,000 |  |
Interest expense |  |  | $ 3,312,000 |
Revisions | Loans and Secured Borrowings [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Total loans |  | 101,615,000 |  |
Consumer Loan [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Period past due for accrued interest receivable | 90 days |  |  |
CECL adoption adjustments [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Decrease to Retained Earnings | $ (6,100,000) |  |  |
ASU 2016-13 [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Jan. 01, 2023 |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true |  |  |
Allowance for credit losses |  | 897,000 |  |
Unfunded loan commitments |  |  |  | $ 3,386,000
ASU 2016-13 [Member] | CECL adoption adjustments [Member] | PCD Loans [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Allowance for credit losses |  |  |  | $ 1,668,000
ASU 2017-04 [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Jan. 01, 2023 |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true |  |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | true |  |  |
ASU 2022-02 [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Jan. 01, 2023 |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true |  |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | true |  |  |
ASU 2023-09 [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Minimum percentage of the amount computed by multiplying pretax income loss by the applicable statutory income tax rate | 5.00% |  |  |
Minimum percentage of total income taxes paid (net of refunds received) | 5.00% |  |  |
Cash and Cash Equivalents [Member] | Interest Rate Swap [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cash pledged as collateral | $ 0 | $ 0 |  |
Unsecured Debt [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Retail loans past due charge off period | 90 days |  |  |
Secured Debt [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Residential real estate loans past due assessment of value period | 180 days |  |  |
Other Debt [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Loans past due charged down to the net realizable value period | 90 days |  |  |
Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of insurance commission revenue of total revenue | 1.00% | 1.00% | 1.00% |
Original maturities for cash and cash equivalents | 90 days |  |  |
Estimated useful life of intangible assets | 12 years |  |  |
Lease term | 6 years |  |  |
Maximum [Member] | Furniture and Equipment [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful life of asset | 7 years |  |  |
Maximum [Member] | Buildings and Improvements [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful life of asset | 50 years |  |  |
Maximum [Member] | WSP [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of insurance commission revenue of total revenue | 1.00% | 1.00% | 1.00% |
Maximum [Member] | CIVB Risk Management, Inc. [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of insurance commission revenue of total revenue | 1.00% | 1.00% | 1.00% |
Minimum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful life of intangible assets | 5 years |  |  |
Lease term | 3 years |  |  |
Minimum [Member] | Furniture and Equipment [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful life of asset | 3 years |  |  |
Minimum [Member] | Buildings and Improvements [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful life of asset | 7 years |  |  |

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