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v3.25.3

Investment Securities (Narrative) (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 USD ($) security | Sep. 30, 2024 USD ($) security | Sep. 30, 2025 USD ($) security | Sep. 30, 2024 USD ($) security | Dec. 31, 2024 USD ($) security
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Number of trading securities held | security | 0 |  | 0 |  | 0
Number of securities held classified as held-to-maturity securities | security | 0 |  | 0 |  | 0
Net unrealized gain on available-for-sale investment securities, net of tax |  |  | $ (492,000) |  | $ (51,300,000)
Net unrealized gain on available-for-sale investment securities, tax |  |  | 198,000 |  | 21,300,000
Number of sales of available-for-sale investment securities during period | security |  | 0 |  | 0 |
Number of calls of available-for-sale investment securities during period | security |  | 0 |  | 0 |
Proceeds from sales of available-for-sale investment securities | $ 274,700,000 |  | 274,708,000 |  |
Realized gains or losses | (62,391,000) | $ 0 | (62,391,000) | $ 0 |
Purchase of available-for-sale investment securities |  |  | 163,169,000 | 5,266,000 |
Transfers between investment categories | $ 0 | 0 | $ 0 | 0 |
Average purchase yield |  |  | 4.54% |  |
Debt securities term | 2 years 9 months 18 days |  | 2 years 9 months 18 days |  |
Credit impairment on securities in unrealized loss position | $ 0 | $ 0 | $ 0 | $ 0 |
Investment securities with fair value pledged at letters of credit | $ 8,900,000 |  | $ 8,900,000 |  | $ 15,500,000
Number of investment securities were pledged to Federal Reserve or Federal Home Loan Bank | security | 0 |  | 0 |  |
Number of investment securities were pledged to secure public deposits | security | 0 |  | 0 |  | 0
Allowance for credit losses on available-for-sale securities | $ 0 |  | $ 0 |  | $ 0
Residential Mortgage-Backed Securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Number of securities which were in a loss position for greater than 12 months | security | 3 |  | 3 |  |

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