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Goodwill and Other Intangibles | 3 Months Ended
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Mar. 31, 2026
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangibles | 6. Goodwill and Other Intangibles Changes in the carrying amount of goodwill for the periods ended March 31, 2026 and December 31, 2025 by reportable segment are as follows (in thousands):
|  | Commercial Banking |  |  | Institutional Banking |  |  | Personal Banking |  |  | Total |
Balances as of January 1, 2026 |  | $ | 1,042,577 |  |  | $ | 76,492 |  |  | $ | 720,756 |  |  | $ | 1,839,825 |
Acquisition of HTLF |  |  | (1,339 | ) |  |  | — |  |  |  | (892 | ) |  |  | (2,231 | )
Balances as of March 31, 2026 |  | $ | 1,041,238 |  |  | $ | 76,492 |  |  | $ | 719,864 |  |  | $ | 1,837,594 |
Balances as of January 1, 2025 |  | $ | 63,113 |  |  | $ | 76,492 |  |  | $ | 67,780 |  |  | $ | 207,385 |
Acquisition of HTLF |  |  | 979,464 |  |  |  | — |  |  |  | 652,976 |  |  |  | 1,632,440 |
Balances as of December 31, 2025 |  | $ | 1,042,577 |  |  | $ | 76,492 |  |  | $ | 720,756 |  |  | $ | 1,839,825 |
The following table lists the finite-lived intangible assets that continue to be subject to amortization as of March 31, 2026 and December 31, 2025 (in thousands):
|  | As of March 31, 2026 |
|  | Core Deposit Intangible Assets |  |  | Customer Relationships |  |  | Total |
Gross carrying amount |  | $ | 481,294 |  |  | $ | 124,085 |  |  | $ | 605,379 |
Accumulated amortization |  |  | 101,011 |  |  |  | 40,959 |  |  |  | 141,970 |
Net carrying amount |  | $ | 380,283 |  |  | $ | 83,126 |  |  | $ | 463,409 |
|  | As of December 31, 2025 |
|  | Core Deposit Intangible Assets |  |  | Customer Relationships |  |  | Total |
Gross carrying amount |  | $ | 481,294 |  |  | $ | 124,085 |  |  | $ | 605,379 |
Accumulated amortization |  |  | 81,203 |  |  |  | 37,307 |  |  |  | 118,510 |
Net carrying amount |  | $ | 400,091 |  |  | $ | 86,778 |  |  | $ | 486,869 |
Related to the acquisition of HTLF, the Company recognized an adjustment of $2.2 million to goodwill during the period ended March 31, 2026. During 2025, the Company recognized $1.6 billion of goodwill, a $474.1 million core deposit intangible asset, wealth customer list of $26.0 million, and purchased credit card relationships of $10.9 million. See Note 13, “Acquisition” for additional information. On September 2, 2025, the Company acquired a healthcare savings account business, which included $32.5 million of deposits. The purchase resulted in recognition of a $4.8 million core deposit intangible asset. The following table has the aggregate amortization expense recognized in each period (in thousands):
|  | Three Months Ended March 31, |
|  | 2026 |  |  | 2025 |
Aggregate amortization expense |  | $ | 23,460 |  |  | $ | 17,482 |
The following table discloses the estimated amortization expense of intangible assets in future periods (in thousands):
For the nine months ending December 31, 2026 |  | $ | 69,660 |
For the year ending December 31, 2027 |  |  | 82,528 |
For the year ending December 31, 2028 |  |  | 70,461 |
For the year ending December 31, 2029 |  |  | 61,515 |
For the year ending December 31, 2030 |  |  | 52,901 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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