| Intangible Asset and Goodwill [Table Text Block] |
The following table shows the activity in goodwill and other intangible assets for three-month and the six-month periods ended June 30, 2026 and 2025.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | (in thousands) | | Goodwill | | Core deposit intangible asset | | Other
intangible assets | | Total | | April 1, 2025 | | $ | 159,595 | | | $ | 3,163 | | | $ | — | | | $ | 162,758 | | | Amortization | | — | | | 273 | | | — | | | 273 | | | June 30, 2025 | | $ | 159,595 | | | $ | 2,890 | | | $ | — | | | $ | 162,485 | | | | | | | | | | | | April 1, 2026 | | $ | 263,424 | | | $ | 35,556 | | | $ | 3,585 | | | $ | 302,565 | | | Acquired goodwill and other intangible assets | | 493 | | | — | | | — | | | 493 | | | Amortization | | — | | | 1,800 | | | 272 | | | 2,072 | | | June 30, 2026 | | $ | 263,917 | | | $ | 33,756 | | | $ | 3,313 | | | $ | 300,986 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | (in thousands) | | Goodwill | | Core deposit intangible asset | | Other
intangible assets | | Total | | December 31, 2024 | | $ | 159,595 | | | $ | 3,437 | | | $ | — | | | $ | 163,032 | | | Amortization | | — | | | 547 | | | — | | | 547 | | | June 30, 2025 | | $ | 159,595 | | | $ | 2,890 | | | $ | — | | | $ | 162,485 | | | | | | | | | | | | December 31, 2025 | | $ | 159,595 | | | $ | 2,395 | | | $ | — | | | $ | 161,990 | | | Acquired goodwill and other intangible assets | | 104,322 | | | 34,440 | | | 3,585 | | | 142,347 | | | Amortization | | — | | | 3,079 | | | 272 | | | 3,351 | | | June 30, 2026 | | $ | 263,917 | | | $ | 33,756 | | | $ | 3,313 | | | $ | 300,986 | |
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| Intangible Asset [Text Block] |
The following table shows the balance of acquired intangible assets at June 30, 2026 and at December 31, 2025:
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | June 30, 2026 | | December 31, 2025 | | (in thousands) | | Gross Carrying Amount | | Accumulated Amortization | | Gross Carrying Amount | | Accumulated Amortization | | Other intangible assets: | | | | | | | | | | Core deposit intangible asset | | $ | 48,896 | | | $ | 15,140 | | | $ | 14,456 | | | $ | 12,061 | | | Customer relationship intangible asset | | 3,585 | | | 272 | | | — | | | — | | | Total | | $ | 52,481 | | | $ | 15,412 | | | $ | 14,456 | | | $ | 12,061 | |
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| Intangible Asset, Finite-Lived, and Capitalized Cost, Software to be Sold, Leased, or Marketed, Estimated Amortization Expense [Table Text Block] |
Estimated amortization expense related to core deposit intangible asset and the customer relationship intangible asset for the remainder of 2026 and the next four years follows:
| | | | | | | | | | | | | | | | (in thousands) | | Core deposit intangible asset | | Customer relationship intangible asset | | Six months ending December 31, 2026 | | $ | 3,549 | | | $ | 326 | | | 2027 | | 6,442 | | | 592 | | 2028 | | 5,679 | | | 527 | | 2029 | | 4,572 | | | 462 | | 2030 | | 3,809 | | | 396 |
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