Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands |
9 Months Ended | |
|---|---|---|
Sep. 30, 2026 |
Dec. 31, 2025 |
|
| Unadvanced Commitment on Impaired Loan | ||
| Schedule of Commitments [Line Items] | ||
| Estimated losses attributable to unadvanced commitments on impaired loans | $ 9,000 | $ 6,000 |
| Commitments to extend credit | ||
| Schedule of Commitments [Line Items] | ||
| Off-balance sheet financial instruments, contractual amounts | 3,136,114 | 2,866,028 |
| Commitments to extend credit | Fixed Rate Loan Commitment | ||
| Schedule of Commitments [Line Items] | ||
| Off-balance sheet financial instruments, contractual amounts | 104,500 | 124,900 |
| Letters of credit | ||
| Schedule of Commitments [Line Items] | ||
| Off-balance sheet financial instruments, contractual amounts | $ 106,549 | $ 102,884 |
| Letters of credit | Maximum | ||
| Schedule of Commitments [Line Items] | ||
| Remaining term | 3 years 9 months | |
| Letters of credit | Minimum | ||
| Schedule of Commitments [Line Items] | ||
| Remaining term | 1 month |