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Loans Receivable - Summary of Allowance for Loan Losses On Loans Receivables (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Allowance for loan losses: |  |  |  |  |  |  |  |
Beginning balance | $ 21,014 |  | $ 18,464 |  | $ 23,657 |  | $ 18,492 |
Purchased non-credit deteriorated loans |  |  | 3,152 | [1] |  |  | 3,152 | [2]
Purchased credit deteriorated loans |  |  | 154 |  |  |  | 154 |
Provision (reversal) | (658) | [3] | 1,536 | [1] | 6,516 | [4] | 1,669 | [2]
Charge-offs | 0 |  | (278) |  | (10,033) |  | (645) |
Recoveries | 85 |  | 172 |  | 301 |  | 378 |
Total | 20,441 |  | 23,200 |  | 20,441 |  | 23,200 |
Commercial real estate [Member] |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |
Beginning balance | 18,050 |  | 16,623 |  | 20,821 |  | 16,047 |
Purchased non-credit deteriorated loans |  |  | 2,106 | [1] |  |  | 2,106 | [2]
Purchased credit deteriorated loans |  |  | 110 |  |  |  | 110 |
Provision (reversal) | (1,057) | [3] | 1,482 | [1] | 6,105 | [4] | 2,219 | [2]
Charge-offs | 0 |  | (1) |  | (9,950) |  | (236) |
Recoveries | 62 |  | 3 |  | 79 |  | 79 |
Total | 17,055 |  | 20,325 |  | 17,055 |  | 20,325 |
Commercial and industrial [Member] |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |
Beginning balance | 1,016 |  | 377 |  | 1,173 |  | 488 |
Purchased non-credit deteriorated loans |  |  | 15 | [1] |  |  | 15 | [2]
Purchased credit deteriorated loans |  |  | 4 |  |  |  | 4 |
Provision (reversal) | (62) | [3] | 867 | [1] | (335) | [4] | 756 | [2]
Charge-offs | 0 |  | (279) |  | (83) |  | (409) |
Recoveries | 23 |  | 134 |  | 222 |  | 264 |
Total | 977 |  | 1,118 |  | 977 |  | 1,118 |
Construction [Member] |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |
Beginning balance | 429 |  | 744 |  | 609 |  | 1,145 |
Purchased non-credit deteriorated loans |  |  | 546 | [1] |  |  | 546 | [2]
Purchased credit deteriorated loans |  |  | 11 |  |  |  | 11 |
Provision (reversal) | (65) | [3] | (699) | [1] | (245) | [4] | (1,100) | [2]
Charge-offs | 0 |  | 0 |  | 0 |  | 0 |
Recoveries | 0 |  | 35 |  | 0 |  | 35 |
Total | 364 |  | 637 |  | 364 |  | 637 |
Residential first-lien mortgage [Member] |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |
Beginning balance | 1,358 |  | 660 |  | 893 |  | 725 |
Purchased non-credit deteriorated loans |  |  | 271 | [1] |  |  | 271 | [2]
Purchased credit deteriorated loans |  |  | 13 |  |  |  | 13 |
Provision (reversal) | 514 | [3] | 8 | [1] | 979 | [4] | (57) | [2]
Charge-offs | 0 |  | 0 |  | 0 |  | 0 |
Recoveries | 0 |  | 0 |  | 0 |  | 0 |
Total | 1,872 |  | 952 |  | 1,872 |  | 952 |
Home equity/consumer [Member] |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |
Beginning balance | 161 |  | 60 |  | 161 |  | 87 |
Purchased non-credit deteriorated loans |  |  | 214 | [1] |  |  | 214 | [2]
Purchased credit deteriorated loans |  |  | 16 |  |  |  | 16 |
Provision (reversal) | 12 | [3] | (122) | [1] | 12 | [4] | (149) | [2]
Charge-offs | 0 |  | 0 |  | 0 |  | 0 |
Recoveries | 0 |  | 0 |  | 0 |  | 0 |
Total | $ 173 |  | $ 168 |  | $ 173 |  | $ 168 |
[1] | The provision for credit losses on the Consolidated Statement of Income is $4.6 million comprising of an increase of $3.2 million related to purchased non-credit deteriorated loans acquired, $1.5 million increase to the allowance for loan loss and a $87 thousand reduction to the reserve for unfunded liabilities.
[2] | The provision for credit losses on the Consolidated Statement of Income is $4.7 million comprising of an increase of $3.2 million related to purchased non-credit deteriorated loans acquired, $1.7 million increase to the allowance for loan loss and a $152 thousand reduction to the reserve for unfunded liabilities.
[3] | The reversal of credit losses on the Consolidated Statement of Income is $672 thousand comprising of a decrease of $658 thousand to the allowance for loan loss and a $14 thousand decrease to the reserve for unfunded liabilities.
[4] | The provision for credit losses on the Consolidated Statement of Income is $6.6 million comprising of an increase of $6.5 million increase to the allowance for loan loss and a $36 thousand increase to the reserve for unfunded liabilities.

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