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Short and Long-Term Funding (Tables) | 9 Months Ended
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Sep. 30, 2025
Debt Disclosure [Abstract] |
Schedule of Debt [Table Text Block] | The following table presents the components of short-term funding (funding with original contractual maturities of one year or less), and long-term funding (funding with original contractual maturities greater than one year):
(in thousands) | Sep 30, 2025 | Dec 31, 2024
Short-term funding |  |
Federal funds purchased | $ | 335,095 |  | $ | 370,325 |
Securities sold under agreements to repurchase | 64,570 |  | 100,044 |
Federal funds purchased and securities sold under agreements to repurchase | $ | 399,665 |  | $ | 470,369 |
Long-term funding |  |
Corporation senior notes, at par | $ | 300,000 |  | $ | 300,000 |
Corporation subordinated notes, at par | 300,000 |  | 550,000 |
Discount and capitalized costs | (7,779) |  | (8,664) |
Subordinated debt fair value hedge(a) | 1,626 |  | (3,996) |
Finance leases | 228 |  | 295 |
Total long-term funding | $ | 594,074 |  | $ | 837,635 |
Total short and long-term funding, excluding FHLB advances | $ | 993,739 |  | $ | 1,308,004 |
FHLB advances |  |
Short-term FHLB advances | $ | 2,810,000 |  | $ | 1,250,000 |
Long-term FHLB advances | 412,251 |  | 611,551 |
FHLB advances fair value hedge(a) | (1,573) |  | (7,744) |
Total FHLB advances | $ | 3,220,679 |  | $ | 1,853,807 |
Total short and long-term funding | $ | 4,214,418 |  | $ | 3,161,811 |
(a) For additional information on the fair value hedges, see Note 9.
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Table Text Block] | The remaining contractual maturity of the securities sold under agreements to repurchase on the consolidated balance sheets is presented in the following table:
| Overnight and Continuous |  |  |  |
(in thousands) | Sep 30, 2025 | Dec 31, 2024 |  |  |  |
Repurchase agreements |  |  |  |  |  |
Agency mortgage-related securities | $ | 64,570 |  | $ | 100,044 |  |  |  |  |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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- Definition Tabular disclosure of the nature and risks of short-term collateralized financing obtained through repurchase agreements, securities lending transactions and repurchase-to-maturity transactions, accounted for as secured borrowings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481420/860-30-50-7 + Details
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