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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 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 as of September 30, 2024 and December 31, 2023, aggregated by the level in the fair value hierarchy within which those measurements fall:
Sep 30, 2024
($ in thousands)Carrying AmountFair ValueLevel 1Level 2Level 3
Assets
Cash and due from banks$554,631 $554,631 $554,631 $— $— 
Interest-bearing deposits in other financial institutions408,101 408,101 408,101 — — 
Federal funds sold and securities purchased under agreements to resell4,310 4,310 4,310 — — 
AFS investment securities:
U.S. Treasury securities36,948 36,948 36,948 — — 
Obligations of state and political subdivisions (municipal securities)81,089 81,089 — 81,089 — 
Residential mortgage-related securities:
FNMA / FHLMC1,085,414 1,085,414 — 1,085,414 — 
GNMA2,663,560 2,663,560 — 2,663,560 — 
Commercial mortgage-related securities:
FNMA / FHLMC18,035 18,035 — 18,035 — 
GNMA151,617 151,617 — 151,617 — 
Asset backed securities:
FFELP112,350 112,350 — 112,350 — 
SBA516 516 — 516 — 
Other debt securities2,997 2,997 — 2,997 — 
Total AFS investment securities4,152,527 4,152,527 36,948 4,115,578 — 
HTM investment securities:
U.S. Treasury securities1,000 990 990 — — 
Obligations of state and political subdivisions (municipal securities), net1,664,665 1,540,273 — 1,540,273 — 
Residential mortgage-related securities:
FNMA / FHLMC900,743 778,883 — 778,883 — 
GNMA45,180 42,979 — 42,979 — 
Private-label329,349 282,103 — 282,103 — 
Commercial mortgage-related securities:
FNMA / FHLMC775,209 659,852 — 659,852 — 
GNMA53,005 47,620 — 47,620 — 
Total HTM investment securities, net3,769,150 3,352,700 990 3,351,710 — 
Equity securities:
Equity securities10,658 10,658 10,587 — 71 
Equity securities at NAV12,500 12,500 
Total equity securities23,158 23,158 
FHLB and Federal Reserve Bank stocks178,168 178,168 — 178,168 — 
Residential loans held for sale67,219 67,219 — 67,219 — 
Commercial loans held for sale11,833 11,833 — 11,833 — 
Loans, net29,594,691 28,606,404 — — 28,606,404 
Bank and corporate owned life insurance686,704 686,704 — 686,704 — 
Mortgage servicing rights, net81,977 81,977 — — 81,977 
Interest rate-related instruments designated as hedging instruments(a)
20,010 20,010 — 20,010 — 
Foreign currency exchange forwards designated as hedging instruments(a)
275 275 — 275 — 
Interest rate-related and other instruments not designated as hedging instruments(a)
95,396 95,396 — 95,396 — 
Foreign currency exchange forwards not designated as hedging instruments(a)
4,865 4,865 — 4,865 — 
Interest rate lock commitments to originate residential mortgage loans held for sale822 822 — — 822 
Total selected assets at fair value$39,653,836 $38,249,099 $1,015,567 $8,531,759 $28,689,273 
(a) Figures are presented gross before netting. See Note 9 and Note 10 for information relating to the impact of offsetting derivative assets and liabilities and cash collateral with the same counterparty where there is a legally enforceable master netting agreement in place.
Sep 30, 2024
($ in thousands)Carrying AmountFair ValueLevel 1Level 2Level 3
Liabilities
Deposits:
Noninterest-bearing demand$5,857,421 $5,857,421 $— $— $5,857,421 
Savings5,072,508 5,072,508 — — 5,072,508 
Interest-bearing demand8,605,578 8,605,578 — — 8,605,578 
Money market6,095,206 6,095,206 — — 6,095,206 
Brokered CDs(a)
4,242,670 4,242,670 — 4,242,670 — 
Other time deposits(a)
3,680,914 3,680,914 — 3,680,914 — 
Total deposits33,554,298 33,554,298 — 7,923,584 25,630,714 
Short-term funding:
Federal funds purchased and securities sold under agreements to repurchase417,028 417,001 — 417,001 — 
BTFP funding500,000 499,960 — 499,960 — 
Total short-term funding917,028 916,961 — 916,961 — 
FHLB advances1,913,294 1,916,520 — 1,916,520 — 
Other long-term funding844,342 843,366 — 843,366 — 
Standby letters of credit(b)
2,386 2,386 — 2,386 — 
Interest rate-related instruments designated as hedging instruments(c)
91 91 — 91 — 
Foreign currency exchange forwards designated as hedging instruments(c)
689 689 — 689 — 
Interest rate-related and other instruments not designated as hedging instruments(c)
142,560 142,560 — 142,560 — 
Foreign currency exchange forwards not designated as hedging instruments(c)
4,579 4,579 — 4,579 — 
Forward commitments to sell residential mortgage loans485 485 — — 485 
Total selected liabilities at fair value$37,379,751 $37,381,935 $— $11,750,736 $25,631,199 

(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 $235 million at September 30, 2024. See Note 11 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments.
(c) Figures are presented gross before netting. See Note 9 and Note 10 for information relating to the impact of offsetting derivative assets and liabilities and cash collateral with the same counterparty where there is a legally enforceable master netting agreement in place.
Dec 31, 2023
($ in thousands)Carrying AmountFair ValueLevel 1Level 2Level 3
Assets
Cash and due from banks$484,384 $484,384 $484,384 $— $— 
Interest-bearing deposits in other financial institutions425,089 425,089 425,089 — — 
Federal funds sold and securities purchased under agreements to resell14,350 14,350 14,350 — — 
AFS investment securities:
U.S. Treasury securities35,902 35,902 35,902 — — 
Obligations of state and political subdivisions (municipal securities)91,817 91,817 — 91,817 — 
Residential mortgage-related securities:
FNMA / FHLMC1,120,794 1,120,794 — 1,120,794 — 
GNMA2,042,675 2,042,675 — 2,042,675 — 
Commercial mortgage-related securities:
FNMA / FHLMC16,937 16,937 — 16,937 — 
GNMA154,793 154,793 — 154,793 — 
Asset backed securities:
FFELP133,975 133,975 — 133,975 — 
SBA1,051 1,051 — 1,051 — 
Other debt securities2,950 2,950 — 2,950 — 
Total AFS investment securities3,600,892 3,600,892 35,902 3,564,990 — 
HTM investment securities:
U.S. Treasury securities999 963 963 — — 
Obligations of state and political subdivisions (municipal securities), net1,682,398 1,553,984 — 1,553,984 — 
Residential mortgage-related securities:
FNMA / FHLMC941,973 804,393 — 804,393 — 
GNMA48,979 46,170 — 46,170 — 
Private-label345,083 289,507 — 289,507 — 
Commercial mortgage-related securities:
FNMA / FHLMC780,995 632,914 — 632,914 — 
GNMA59,733 52,619 — 52,619 — 
Total HTM investment securities, net3,860,160 3,380,550 963 3,379,586 — 
Equity securities:
Equity securities31,651 31,651 6,883 — 24,769 
Equity securities at NAV10,000 10,000 
Total equity securities41,651 41,651 
FHLB and Federal Reserve Bank stocks229,171 229,171 — 229,171 — 
Residential loans held for sale33,011 33,011 — 33,011 — 
Commercial loans held for sale90,303 90,303 — 90,303 — 
Loans, net28,865,124 27,371,086 — — 27,371,086 
Bank and corporate owned life insurance682,649 682,649 — 682,649 — 
Mortgage servicing rights, net84,390 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 sale439 439 — — 439 
Total selected assets at fair value$38,534,897 $36,561,249 $967,570 $8,102,995 $27,480,684 
(a) Figures are presented gross before netting. See Note 9 and Note 10 for information relating to the impact of offsetting derivative assets and liabilities and cash collateral with the same counterparty where there is a legally enforceable master netting agreement in place.
Dec 31, 2023
($ in thousands)Carrying AmountFair ValueLevel 1Level 2Level 3
Liabilities
Deposits:
Noninterest-bearing demand$6,119,956 $6,119,956 $— $— $6,119,956 
Savings4,835,701 4,835,701 — — 4,835,701 
Interest-bearing demand8,843,967 8,843,967 — — 8,843,967 
Money market6,330,453 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 deposits33,446,049 33,446,049 — 7,315,973 26,130,076 
Federal funds purchased and securities sold under agreements to repurchase326,780 326,757 — 326,757 — 
FHLB advances1,940,194 1,944,600 — 1,944,600 — 
Other long-term funding541,269 534,983 — 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 loans673 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 $212 million at December 31, 2023. See Note 11 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments.
(c) Figures are presented gross before netting. See Note 9 and Note 10 for information relating to the impact of offsetting derivative assets and liabilities and cash collateral with the same counterparty where there is a legally enforceable master netting agreement in place.
Equity Securities without Readily Determinable Fair Value [Table Text Block]
The following table presents a rollforward of the fair value of Level 3 equity securities, for the nine months ended September 30, 2024 and the year ended December 31, 2023, that are measured under the measurement alternative and the related adjustments recorded during the periods presented for those securities with observable price changes:
 ($ in thousands)
Fair value as of December 31, 2022$19,225 
Gains recognized in investment securities gains, net5,861 
Purchases11 
Sales(329)
Fair value as of December 31, 2023
$24,769 
Gains recognized in investment securities gains, net$4,054 
Purchases21 
Sales(28,772)
Fair value as of September 30, 2024
$71 
Fair Value Measurements, Nonrecurring [Table Text Block]
The table below presents the Corporation’s assets measured at fair value on a nonrecurring basis, aggregated by the level in the fair value hierarchy within which those measurements fall:
($ in thousands)Fair Value HierarchyFair ValueConsolidated Statements of Income Category of Adjustment Recognized in Income
Adjustment Recognized on the Consolidated Statements of Income(a)
Sep 30, 2024
Assets
Individually evaluated loansLevel 3$34,440 Provision for credit losses$11,686 
OREO(b)
Level 2188 
Other noninterest expense / provision for credit losses(c)
267 
Dec 31, 2023
Assets
Individually evaluated loansLevel 3$47,221 Provision for credit losses$45,709 
OREO(b)
Level 23,139 
Other noninterest expense / provision for credit losses(c)
2,532 
Equity securities without readily determinable fair valuesLevel 324,671 Investment securities gains (losses), net5,785 
(a) Includes the YTD 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.
Schedule of Assumptions for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Table Text Block]
The table below presents the unobservable inputs that are readily quantifiable pertaining to Level 3 measurements:
Sep 30, 2024Valuation TechniqueSignificant Unobservable InputRange of InputsWeighted Average Input Applied
Mortgage servicing rightsDiscounted cash flowOption adjusted spread5%-8%5%
Mortgage servicing rightsDiscounted cash flowConstant prepayment rate1%-100%6%
Individually evaluated loansAppraisals / discounted cash flowCollateral / discount factor6%-73%57%
Interest rate lock commitments to originate residential mortgage loans held for saleDiscounted cash flowClosing ratio46%-100%90%