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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2024
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] | The tables below present the Corporation’s financial instruments measured at fair value on a recurring basis and carrying amounts and estimated fair values of certain financial instruments, aggregated by the level in the fair value hierarchy within which those measurements fall:
| December 31, 2024
($ in thousands) | Carrying Amount | Fair Value | Level 1 | Level 2 | Level 3
Assets |  |  |  |  |
Cash and due from banks | $ | 544,059 |  | $ | 544,059 |  | $ | 544,059 |  | $ | — |  | $ | — |
Interest-bearing deposits in other financial institutions | 453,590 |  | 453,590 |  | 453,590 |  | — |  | — |
Federal funds sold and securities purchased under agreements to resell | 21,955 |  | 21,955 |  | 21,955 |  | — |  | — |
AFS investment securities: |  |  |  |  |
Obligations of state and political subdivisions (municipal securities) | 3,005 |  | 3,005 |  | — |  | 3,005 |  | — |
Residential mortgage-related securities: |  |  |  |  |
FNMA / FHLMC | 110,928 |  | 110,928 |  | — |  | 110,928 |  | — |
GNMA | 4,227,727 |  | 4,227,727 |  | — |  | 4,227,727 |  | — |
Commercial mortgage-related securities: |  |  |  |  |
FNMA / FHLMC | 17,000 |  | 17,000 |  | — |  | 17,000 |  | — |
GNMA | 111,475 |  | 111,475 |  | — |  | 111,475 |  | — |
Asset backed securities: |  |  |  |  |
FFELP | 107,839 |  | 107,839 |  | — |  | 107,839 |  | — |
SBA | 471 |  | 471 |  | — |  | 471 |  | — |
Other debt securities | 2,989 |  | 2,989 |  | — |  | 2,989 |  | — |
Total AFS investment securities | 4,581,434 |  | 4,581,434 |  | — |  | 4,581,434 |  | — |
HTM investment securities: |  |  |  |  |
U.S. Treasury securities | 1,000 |  | 999 |  | 999 |  | — |  | — |
Obligations of state and political subdivisions (municipal securities), net | 1,659,662 |  | 1,486,582 |  | — |  | 1,486,582 |  | — |
Residential mortgage-related securities: |  |  |  |  |
FNMA / FHLMC | 885,476 |  | 721,946 |  | — |  | 721,946 |  | — |
GNMA | 43,693 |  | 39,927 |  | — |  | 39,927 |  | — |
Private-label | 324,182 |  | 266,353 |  | — |  | 266,353 |  | — |
Commercial mortgage-related securities: |  |  |  |  |
FNMA / FHLMC | 772,456 |  | 623,595 |  | — |  | 623,595 |  | — |
GNMA | 52,219 |  | 46,032 |  | — |  | 46,032 |  | — |
Total HTM investment securities, net | 3,738,687 |  | 3,185,434 |  | 999 |  | 3,184,435 |  | — |
Equity securities: |  |  |  |  |
Equity securities | 10,742 |  | 10,742 |  | 10,670 |  | — |  | 72 |
Equity securities at NAV | 12,500 |  | 12,500 |  |  |  |
Total equity securities | 23,242 |  | 23,242 |  |  |  |
FHLB and Federal Reserve Bank stocks | 179,665 |  | 179,665 |  | — |  | 179,665 |  | — |
Residential loans held for sale | 646,687 |  | 646,687 |  | — |  | 646,687 |  | — |
Commercial loans held for sale | 32,634 |  | 32,634 |  | — |  | 32,634 |  | — |
Loans, net | 29,373,557 |  | 28,327,115 |  | — |  | — |  | 28,327,115 |
Bank and corporate owned life insurance | 689,000 |  | 689,000 |  | — |  | 689,000 |  | — |
Mortgage servicing rights, net | 87,683 |  | 87,683 |  | — |  | — |  | 87,683 |
Interest rate-related instruments designated as hedging instruments(a) | 2,960 |  | 2,960 |  | — |  | 2,960 |  | — |
Foreign currency exchange forwards designated as hedging instruments(a) | 2,457 |  | 2,457 |  | — |  | 2,457 |  | — |
Interest rate-related and other instruments not designated as hedging instruments(a) | 88,541 |  | 88,541 |  | — |  | 88,541 |  | — |
Foreign currency exchange forwards not designated as hedging instruments(a) | 4,315 |  | 4,315 |  | — |  | 4,315 |  | — |
Interest rate lock commitments to originate residential mortgage loans held for sale | 327 |  | 327 |  | — |  | — |  | 327 |
Forward commitments to sell residential mortgage loans | 254 |  | 254 |  | — |  | — |  | 254 |
Total selected assets at fair value | $ | 40,471,048 |  | $ | 38,871,352 |  | $ | 1,031,273 |  | $ | 9,412,129 |  | $ | 28,415,450 |
(a) Figures are presented gross before netting. See Note 13 and Note 14 for information relating to the impact of offsetting derivative assets and liabilities and cash collateral with the same counterparty where there is a legally enforceable master netting agreement in place.
| December 31, 2024
($ in thousands) | Carrying Amount | Fair Value | Level 1 | Level 2 | Level 3
Liabilities |  |  |  |  |
Deposits: |  |  |  |  |
Noninterest-bearing demand | $ | 5,775,657 |  | $ | 5,775,657 |  | $ | — |  | $ | — |  | $ | 5,775,657 |
Savings | 5,133,295 |  | 5,133,295 |  | — |  | — |  | 5,133,295 |
Interest-bearing demand | 9,124,741 |  | 9,124,741 |  | — |  | — |  | 9,124,741 |
Money market | 6,637,915 |  | 6,637,915 |  | — |  | — |  | 6,637,915 |
Brokered CDs(a) | 4,276,309 |  | 4,276,309 |  | — |  | 4,276,309 |  | — |
Other time deposits(a) | 3,700,518 |  | 3,700,518 |  | — |  | 3,700,518 |  | — |
Total deposits | 34,648,434 |  | 34,648,434 |  | — |  | 7,976,827 |  | 26,671,607 |
Federal funds purchased and securities sold under agreements to repurchase | 470,369 |  | 470,370 |  | — |  | 470,370 |  | — |
FHLB advances | 1,853,807 |  | 1,852,685 |  | — |  | 1,852,685 |  | — |
Other long-term funding | 837,635 |  | 823,991 |  | — |  | 823,991 |  | — |
Standby letters of credit(b) | 2,546 |  | 2,546 |  | — |  | 2,546 |  | — |
Interest rate-related instruments designated as hedging instruments(c) | 2,976 |  | 2,976 |  | — |  | 2,976 |  | — |
Foreign currency exchange forwards designated as hedging instruments(c) | 563 |  | 563 |  | — |  | 563 |  | — |
Interest rate-related and other instruments not designated as hedging instruments(c) | 170,928 |  | 170,928 |  | — |  | 170,928 |  | — |
Foreign currency exchange forwards not designated as hedging instruments(c) | 4,106 |  | 4,106 |  | — |  | 4,106 |  | — |
Total selected liabilities at fair value | $ | 37,991,364 |  | $ | 37,976,599 |  | $ | — |  | $ | 11,304,992 |  | $ | 26,671,607 |
(a) When the estimated fair value is less than the carrying value, the carrying value is reported as the fair value. (b) The commitment on standby letters of credit was $254 million at December 31, 2024. See Note 15 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments. (c) Figures are presented gross before netting. See Note 13 and Note 14 for information relating to the impact of offsetting derivative assets and liabilities and cash collateral with the same counterparty where there is a legally enforceable master netting agreement in place.
| December 31, 2023
($ in thousands) | Carrying Amount | Fair Value | Level 1 | Level 2 | Level 3
Assets |  |  |  |  |
Cash and due from banks | $ | 484,384 |  | $ | 484,384 |  | $ | 484,384 |  | $ | — |  | $ | — |
Interest-bearing deposits in other financial institutions | 425,089 |  | 425,089 |  | 425,089 |  | — |  | — |
Federal funds sold and securities purchased under agreements to resell | 14,350 |  | 14,350 |  | 14,350 |  | — |  | — |
AFS investment securities: |  |  |  |  |
U.S. Treasury securities | 35,902 |  | 35,902 |  | 35,902 |  | — |  | — |
Obligations of state and political subdivisions (municipal securities) | 91,817 |  | 91,817 |  | — |  | 91,817 |  | — |
Residential mortgage-related securities: |  |  |  |  |
FNMA / FHLMC | 1,120,794 |  | 1,120,794 |  | — |  | 1,120,794 |  | — |
GNMA | 2,042,675 |  | 2,042,675 |  | — |  | 2,042,675 |  | — |
Commercial mortgage-related securities: |  |  |  |  |
FNMA / FHLMC | 16,937 |  | 16,937 |  | — |  | 16,937 |  | — |
GNMA | 154,793 |  | 154,793 |  | — |  | 154,793 |  | — |
Asset backed securities: |  |  |  |  |
FFELP | 133,975 |  | 133,975 |  | — |  | 133,975 |  | — |
SBA | 1,051 |  | 1,051 |  | — |  | 1,051 |  | — |
Other debt securities | 2,950 |  | 2,950 |  | — |  | 2,950 |  | — |
Total AFS investment securities | 3,600,892 |  | 3,600,892 |  | 35,902 |  | 3,564,990 |  | — |
HTM investment securities: |  |  |  |  |
U.S. Treasury securities | 999 |  | 963 |  | 963 |  | — |  | — |
Obligations of state and political subdivisions (municipal securities), net | 1,682,398 |  | 1,553,984 |  | — |  | 1,553,984 |  | — |
Residential mortgage-related securities: |  |  |  |  |
FNMA / FHLMC | 941,973 |  | 804,393 |  | — |  | 804,393 |  | — |
GNMA | 48,979 |  | 46,170 |  | — |  | 46,170 |  | — |
Private-label | 345,083 |  | 289,507 |  | — |  | 289,507 |  | — |
Commercial mortgage-related securities: |  |  |  |  |
FNMA / FHLMC | 780,995 |  | 632,914 |  | — |  | 632,914 |  | — |
GNMA | 59,733 |  | 52,619 |  | — |  | 52,619 |  | — |
Total HTM investment securities, net | 3,860,160 |  | 3,380,550 |  | 963 |  | 3,379,586 |  | — |
Equity securities: |  |  |  |  |
Equity securities | 31,651 |  | 31,651 |  | 6,883 |  | — |  | 24,769 |
Equity securities at NAV | 10,000 |  | 10,000 |  |  |  |
Total equity securities | 41,651 |  | 41,651 |  |  |  |
FHLB and Federal Reserve Bank stocks | 229,171 |  | 229,171 |  | — |  | 229,171 |  | — |
Residential loans held for sale | 33,011 |  | 33,011 |  | — |  | 33,011 |  | — |
Commercial loans held for sale | 90,303 |  | 90,303 |  | — |  | 90,303 |  | — |
Loans, net | 28,865,124 |  | 27,371,086 |  | — |  | — |  | 27,371,086 |
Bank and corporate owned life insurance | 682,649 |  | 682,649 |  | — |  | 682,649 |  | — |
Mortgage servicing rights, net | 84,390 |  | 84,390 |  | — |  | — |  | 84,390 |
Interest rate-related instruments designated as hedging instruments(a) | 8,075 |  | 8,075 |  | — |  | 8,075 |  | — |
Foreign currency exchange forwards designated as hedging instruments(a) | 632 |  | 632 |  | — |  | 632 |  | — |
Interest rate-related and other instruments not designated as hedging instruments(a) | 111,623 |  | 111,623 |  | — |  | 111,623 |  | — |
Foreign currency exchange forwards not designated as hedging instruments(a) | 2,954 |  | 2,954 |  | — |  | 2,954 |  | — |
Interest rate lock commitments to originate residential mortgage loans held for sale | 439 |  | 439 |  | — |  | — |  | 439 |
Total selected assets at fair value | $ | 38,534,897 |  | $ | 36,561,249 |  | $ | 967,570 |  | $ | 8,102,995 |  | $ | 27,480,684 |
(a) Figures are presented gross before netting. See Note 13 and Note 14 for information relating to the impact of offsetting derivative assets and liabilities and cash collateral with the same counterparty where there is a legally enforceable master netting agreement in place.
| December 31, 2023
($ in thousands) | Carrying Amount | Fair Value | Level 1 | Level 2 | Level 3
Liabilities |  |  |  |  |
Deposits: |  |  |  |  |
Noninterest-bearing demand | $ | 6,119,956 |  | $ | 6,119,956 |  | $ | — |  | $ | — |  | $ | 6,119,956 |
Savings | 4,835,701 |  | 4,835,701 |  | — |  | — |  | 4,835,701 |
Interest-bearing demand | 8,843,967 |  | 8,843,967 |  | — |  | — |  | 8,843,967 |
Money market | 6,330,453 |  | 6,330,453 |  | — |  | — |  | 6,330,453 |
Brokered CDs(a) | 4,447,479 |  | 4,447,479 |  | — |  | 4,447,479 |  | — |
Other time deposits(a) | 2,868,494 |  | 2,868,494 |  | — |  | 2,868,494 |  | — |
Total deposits | 33,446,049 |  | 33,446,049 |  | — |  | 7,315,973 |  | 26,130,076 |
Federal funds purchased and securities sold under agreements to repurchase | 326,780 |  | 326,757 |  | — |  | 326,757 |  | — |
FHLB advances | 1,940,194 |  | 1,944,600 |  | — |  | 1,944,600 |  | — |
Other long-term funding | 541,269 |  | 534,983 |  | — |  | 534,983 |  | — |
Standby letters of credit(b) | 2,157 |  | 2,157 |  | — |  | 2,157 |  | — |
Interest rate-related instruments designated as hedging instruments(c) | 930 |  | 930 |  | — |  | 930 |  | — |
Foreign currency exchange forwards designated as hedging instruments(c) | 2,946 |  | 2,946 |  | — |  | 2,946 |  | — |
Interest rate-related and other instruments not designated as hedging instruments(c) | 195,662 |  | 195,662 |  | — |  | 195,662 |  | — |
Foreign currency exchange forwards not designated as hedging instruments(c) | 2,746 |  | 2,746 |  | — |  | 2,746 |  | — |
Forward commitments to sell residential mortgage loans | 673 |  | 673 |  | — |  | — |  | 673 |
Total selected liabilities at fair value | $ | 36,459,407 |  | $ | 36,457,504 |  | $ | — |  | $ | 10,326,755 |  | $ | 26,130,749 |
(a) When the estimated fair value is less than the carrying value, the carrying value is reported as the fair value. (b) The commitment on standby letters of credit was $212 million at December 31, 2023. See Note 15 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments. (c) Figures are presented gross before netting. See Note 13 and Note 14 for information relating to the impact of offsetting derivative assets and liabilities and cash collateral with the same counterparty where there is a legally enforceable master netting agreement in place.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] | The table below presents a rollforward of the consolidated balance sheets amounts for the Corporation's mortgage derivatives measured on a recurring basis and classified within Level 3 of the fair value hierarchy:
($ in thousands) | Interest rate lock commitments to originate residential mortgage loans held for sale | Forward commitments to sell residential mortgage loans | Total
Balance December 31, 2022 | $ | 86 |  | $ | 46 |  | $ | 40 |
New production | 6,557 |  | (1,816) |  | 8,373 |
Closed loans / settlements | (4,171) |  | 2,494 |  | (6,665) |
Other | (2,033) |  | (51) |  | (1,982) |
Change in mortgage derivative | 352 |  | 627 |  | (274) |
Balance December 31, 2023 | $ | 439 |  | $ | 673 |  | $ | (234) |
New production | $ | 11,771 |  | $ | (4,000) |  | $ | 15,771 |
Closed loans / settlements | (8,816) |  | 3,512 |  | (12,328) |
Other | (3,068) |  | (438) |  | (2,630) |
Change in mortgage derivative | (113) |  | (927) |  | 814 |
Balance December 31, 2024 | $ | 327 |  | $ | (254) |  | $ | 580 |
Equity Securities without Readily Determinable Fair Value [Table Text Block] | The following table presents a rollforward of the fair value of Level 3 equity securities that are measured under the measurement alternative, and the related adjustments recorded during the periods presented for those securities with observable price changes:
($ in thousands) |
Fair value as of December 31, 2022 | $ | 19,225 |
Gains recognized in investment securities gains, net | 5,861 |
Purchases | 11 |
Sales | (329) |
Fair value as of December 31, 2023 | $ | 24,769 |
Gains recognized in investment securities gains, net | $ | 4,054 |
Purchases | 22 |
Sales | (28,772) |
Fair value as of December 31, 2024 | $ | 72 |
Fair Value Measurements, Nonrecurring [Table Text Block] | The table below presents the Corporation’s assets measured at fair value on a nonrecurring basis, aggregated by the level in the fair value hierarchy within which those measurements fall:
($ in thousands) | Fair Value Hierarchy | Fair Value | Consolidated Statements of Income Category of Adjustment Recognized in Income | Adjustment Recognized on the Consolidated Statements of Income(a)
December 31, 2024 |  |  |  |
Assets |  |  |
Individually evaluated loans | Level 3 | $ | 31,483 |  | Provision for credit losses | $ | 17,454 |
OREO(b) | Level 2 | 276 |  | Other noninterest expense / provision for credit losses(c) | 1,067 |
December 31, 2023 |  |  |  |
Assets |  |  |  |
Individually evaluated loans | Level 3 | $ | 47,221 |  | Provision for credit losses | $ | 45,709 |
OREO(b) | Level 2 | 3,139 |  | Other noninterest expense / provision for credit losses(c) | 2,532 |
Equity securities without readily determinable fair values | Level 3 | 24,671 |  | Investment securities gains (losses), net | 5,785 |
(a) Includes the full year impact on the consolidated statements of income. (b) If the fair value of the collateral exceeds the carrying amount of the asset, no charge off or adjustment is necessary, the asset is not considered to be carried at fair value, and is therefore not included in the table. (c) When a property's value is written down at the time it is transferred to OREO, the charge off is booked to the provision for credit losses. When a property is already in OREO and subsequently written down, the charge off is booked to other noninterest expense.
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] | The table below presents the unobservable inputs that are readily quantifiable pertaining to Level 3 measurements:
December 31, 2024 | Valuation Technique | Significant Unobservable Input | Range of Inputs | Weighted Average Input Applied
Mortgage servicing rights | Discounted cash flow | Option adjusted spread | 5% | - | 8% | 5%
Mortgage servicing rights | Discounted cash flow | Constant prepayment rate | —% | - | 100% | 4%
Individually evaluated loans | Appraisals / discounted cash flow | Collateral / discount factor | —% | - | 77% | 61%
Interest rate lock commitments to originate residential mortgage loans held for sale | Discounted cash flow | Closing ratio | 55% | - | 100% | 92%

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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