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Goodwill and Other Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets [Table Text Block] | Changes in the gross carrying amount, accumulated amortization, and net book value for CDIs were as follows:
(in thousands) | Six Months Ended Jun 30, 2025 | Year Ended Dec 31, 2024
Core deposit intangibles |  |
Gross carrying amount at the beginning of period | $ | 88,109 |  | $ | 88,109 |
Accumulated amortization | (60,854) |  | (56,449) |
Net book value | $ | 27,255 |  | $ | 31,660 |
Amortization during the period | $ | 4,405 |  | $ | 8,811 |
Schedule of Servicing Assets at Fair Value [Table Text Block] | A summary of changes in the balance of the MSRs asset under the fair value measurement method is as follows:
(in thousands) | Six Months Ended Jun 30, 2025 | Year Ended Dec 31, 2024 |
Mortgage servicing rights |  |  |
Mortgage servicing rights at beginning of period | $ | 87,683 |  | $ | 84,390 |  |
Additions | 3,256 |  | 6,707 |  |
Decay | (4,062) |  | (8,060) |  |
Valuation: |  |  |
Changes in fair value of asset | (1,632) |  | 4,646 |  |
Mortgage servicing rights at end of period | $ | 85,245 |  | $ | 87,683 |  |
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) | $ | 6,185,631 |  | $ | 6,285,018 |  |
Mortgage servicing rights to servicing portfolio | 1.38 | % | 1.40 | % |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | The following table shows the estimated future yearly amortization expense for CDIs and decay for MSRs:
(in thousands) | Core Deposit Intangibles |  | Mortgage Servicing Rights
Six months ended December 31, 2025 | $ | 4,405 |  |  | $ | 4,695 |
2026 | 8,811 |  |  | 10,817 |
2027 | 8,811 |  |  | 11,309 |
2028 | 3,485 |  |  | 10,955 |
2029 | 1,681 |  |  | 9,945 |
2030 | 61 |  |  | 8,840 |
Beyond 2030 | — |  |  | 28,684 |
Total estimated amortization expense and MSRs decay(a) | $ | 27,255 |  |  | $ | 85,245 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 + Details
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- Definition Tabular disclosure of the activity in the balance of servicing assets (including a description of where changes in fair value are reported in the statement of income for each period for which results of operations are presented), including but not limited to, the following: beginning and ending balances, additions (for instance, through purchases of servicing assets), disposals, changes in fair value during the period resulting from changes in inputs or assumptions used in the valuation model, other changes in fair value along with a description of those changes, and other changes that affect the balance along with a description of those changes. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481229/860-50-50-3 + Details
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