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v3.25.3

Investment Securities - Additional Information (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2025 USD ($) security | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) security | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Carrying value of investment securities | $ 2,660,000,000 |  | $ 2,660,000,000 |  | $ 2,610,000,000 |
Investment securities pledged as collateral | 146,000,000.0 |  | 146,000,000.0 |  | 162,400,000 |
Available for sale securities sold | 0 | $ 0 | 0 | $ 0 |  |
Allowance for credit losses | 0 | 2,195,000 | 0 | 2,195,000 | 2,195,000 | $ 2,525,000
Allowance for credit losses | 2,005,000 | $ 2,005,000 | 2,005,000 | $ 2,005,000 | 2,005,000 | $ 2,005,000
Debt securities available for sale unrealized loss position | (245,006,000) |  | (245,006,000) |  | (338,604,000) |
Fair value of unrealized losses | $ 243,930,000 |  | $ 243,930,000 |  | 334,860,000 |
Percentage of Company's investment portfolio |  |  | 43.50% |  |  |
Maturity description of investment portfolio |  |  | five years or less |  |  |
Number of investment securities available for sale | security | 1,494 |  | 1,494 |  |  |
Number of investment in debt securities available-for-sale unrealized loss position | security | 1,206 |  | 1,206 |  |  |
Number of investment securities held to maturity | security | 514 |  | 514 |  |  |
Number of investments in debt securities held-to-maturity unrealized loss position | security | 494 |  | 494 |  |  |
Unrealized losses | $ (107,525,000) |  | $ (107,525,000) |  | (132,303,000) |
U.S. government-sponsored enterprises |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Allowance for credit losses | 0 |  | 0 |  | 0 |
Allowance for credit losses | 0 |  | 0 |  | 0 |
Debt securities available for sale unrealized loss position | (8,394,000) |  | (8,394,000) |  | (14,072,000) |
Fair value of unrealized losses | $ 8,330,000 |  | $ 8,330,000 |  | 13,746,000 |
Number of investment in debt securities available-for-sale unrealized loss position | security | 61 |  | 61 |  |  |
Number of investments in debt securities held-to-maturity unrealized loss position | security | 5 |  | 5 |  |  |
Unrealized losses | $ (1,523,000) |  | $ (1,523,000) |  | (3,021,000) |
U.S. government-sponsored mortgage-backed securities |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Allowance for credit losses | 0 |  | 0 |  | 0 |
Allowance for credit losses | 0 |  | 0 |  | 0 |
Debt securities available for sale unrealized loss position | (138,541,000) |  | (138,541,000) |  | (203,539,000) |
Fair value of unrealized losses | $ 138,519,000 |  | $ 138,519,000 |  | 202,451,000 |
Number of investment in debt securities available-for-sale unrealized loss position | security | 616 |  | 616 |  |  |
Number of investments in debt securities held-to-maturity unrealized loss position | security | 14 |  | 14 |  |  |
Unrealized losses | $ (3,366,000) |  | $ (3,366,000) |  | (6,695,000) |
Private mortgage-backed securities |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Allowance for credit losses | 0 |  | 0 |  | 0 |
Debt securities available for sale unrealized loss position | (7,417,000) |  | (7,417,000) |  | (13,249,000) |
Fair value of unrealized losses | $ 7,417,000 |  | $ 7,417,000 |  | 13,120,000 |
Number of investment in debt securities available-for-sale unrealized loss position | security | 29 |  | 29 |  |  |
Non-government-sponsored asset backed securities |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Allowance for credit losses | $ 0 |  | $ 0 |  |  |
Debt securities available for sale unrealized loss position | (1,067,000) |  | (1,067,000) |  | (3,434,000) |
Fair value of unrealized losses | $ 1,066,000 |  | $ 1,066,000 |  | 3,374,000 |
Number of investment in debt securities available-for-sale unrealized loss position | security | 15 |  | 15 |  |  |
State and political subdivisions |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Allowance for credit losses | $ 0 |  | $ 0 |  | 0 |
Allowance for credit losses | 2,005,000 |  | 2,005,000 |  | 2,005,000 |
Debt securities available for sale unrealized loss position | (78,219,000) |  | (78,219,000) |  | (86,029,000) |
Fair value of unrealized losses | $ 77,308,000 |  | $ 77,308,000 |  | 84,799,000 |
Number of investment in debt securities available-for-sale unrealized loss position | security | 426 |  | 426 |  |  |
Number of investments in debt securities held-to-maturity unrealized loss position | security | 475 |  | 475 |  |  |
Unrealized losses | $ (102,636,000) |  | $ (102,636,000) |  | (122,587,000) |
Other securities |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Allowance for credit losses | 0 |  | 0 |  | 2,195,000 |
Debt securities available for sale unrealized loss position | (11,368,000) |  | (11,368,000) |  | (18,281,000) |
Fair value of unrealized losses | $ 11,290,000 |  | $ 11,290,000 |  | $ 17,370,000 |
Number of investment in debt securities available-for-sale unrealized loss position | security | 59 |  | 59 |  |  |

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