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Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Jan. 01, 2023 | Dec. 31, 2022
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses | $ 39,919 | $ 35,149 | $ 39,919 | $ 35,149 | $ 38,849 | $ 37,160 | $ 34,196 |  | $ 28,511
Increase in allowance for credit losses |  |  | 4,300 |  |  |  |  |  |
Unfunded loan commitments | 3,400 |  | 3,400 |  |  |  |  | $ 3,400 |
Increase in deferred tax assets |  |  | 1,600 |  |  |  |  |  |
Interest income | 50,593 | 44,609 | 100,721 | 87,534 |  |  |  |  |
Interest expense | 22,842 | 13,270 | 44,598 | 23,594 |  |  |  |  |
Discount from loans to allowance for credit losses |  |  |  |  |  |  |  | 1,700 |
Decrease to Retained Earnings | (192,186) |  | (192,186) |  |  | $ (183,788) |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Decrease to Retained Earnings | $ 6,100 |  | $ 6,100 |  |  |  |  | 6,100 |
Consumer Loan [Member] |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Period past due for accrued interest receivable |  |  | 90 days |  |  |  |  |  |
Revisions |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Interest income |  | 1,270 |  | 2,656 |  |  |  |  |
Interest expense |  | $ 1,270 |  | $ 2,656 |  |  |  |  |
ASU 2016-13 [Member] |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true |  | true |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Jan. 01, 2023 |  | Jan. 01, 2023 |  |  |  |  |  |
Allowance for credit losses |  |  |  |  |  |  |  |  | $ 897
Unfunded loan commitments |  |  |  |  |  |  |  | 3,386 |
ASU 2016-13 [Member] | PCD Loans [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses |  |  |  |  |  |  |  | $ 1,700 |
ASU 2017-04 [Member] |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true |  | true |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Jan. 01, 2023 |  | Jan. 01, 2023 |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | true |  | true |  |  |  |  |  |
ASU 2022-02 [Member] |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true |  | true |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Jan. 01, 2023 |  | Jan. 01, 2023 |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | true |  | true |  |  |  |  |  |

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