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Fair Value Measurement (Tables)
 3 Months Ended
Mar. 31, 2024
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping
The following table presents estimated fair values of the Company's financial instruments as of the dates presented, whether or not recognized or recorded at fair value on a recurring basis in the Condensed Consolidated Balance Sheets:  
March 31, 2024December 31, 2023
 (in thousands)LevelCarrying ValueFair ValueCarrying ValueFair Value
Financial assets:    
Cash and cash equivalents1$2,201,117 $2,201,117 $2,162,534 $2,162,534 
Equity and other investment securities1,277,203 77,203 76,995 76,995 
Investment securities available for sale1,28,616,545 8,616,545 8,829,870 8,829,870 
Investment securities held to maturity32,247 2,939 2,300 3,025 
Loans held for sale247,201 47,201 30,715 30,715 
Loans and leases, net
2,337,228,069 35,740,658 37,001,080 35,810,989 
Restricted equity securities1116,274 116,274 179,274 179,274 
Residential mortgage servicing rights3110,444 110,444 109,243 109,243 
Bank-owned life insurance1682,293 682,293 680,948 680,948 
Derivatives2,3114,763 114,763 38,085 38,085 
Financial liabilities:    
Demand, money market, and savings deposits1$35,366,323 $35,366,323 $35,379,451 $35,379,451 
Time deposits26,339,837 6,314,381 6,227,569 6,201,519 
Securities sold under agreements to repurchase2213,573 213,573 252,119 252,119 
Borrowings23,900,000 3,893,589 3,950,000 3,950,037 
Junior subordinated debentures, at fair value3309,544 309,544 316,440 316,440 
Junior and other subordinated debentures, at amortized cost3107,838 98,867 107,895 97,695 
Derivatives2,3312,489 312,489 261,091 261,091 
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
The following tables present information about the Company's assets and liabilities measured at fair value on a recurring basis as of the periods presented: 
(in thousands) 
March 31, 2024
DescriptionTotalLevel 1Level 2Level 3
Financial assets:
Equity and other investment securities    
Investments in mutual funds and other securities$62,497 $44,038 $18,459 $— 
Equity securities held in rabbi trusts14,706 14,706 — — 
Investment securities available for sale    
U.S. Treasury and agencies1,467,393 372,865 1,094,528 — 
Obligations of states and political subdivisions1,051,929 — 1,051,929 — 
Mortgage-backed securities and collateralized mortgage obligations6,097,223 — 6,097,223 — 
Loans held for sale, at fair value47,201 — 47,201 — 
Loans and leases, at fair value267,806 — 267,806 — 
Residential mortgage servicing rights, at fair value110,444 — — 110,444 
Derivatives    
Interest rate lock commitments16 — — 16 
Interest rate forward sales commitments74 — 74 — 
Interest rate swaps114,347 — 114,347 — 
Foreign currency derivatives326 — 326 — 
Total assets measured at fair value$9,233,962 $431,609 $8,691,893 $110,460 
Financial liabilities:
Junior subordinated debentures, at fair value$309,544 $— $— $309,544 
Derivatives    
Interest rate futures1,134 — 1,134 — 
Interest rate forward sales commitments188 — 188 — 
Interest rate swaps310,985 — 310,985 — 
Foreign currency derivatives182 — 182 — 
Total liabilities measured at fair value$622,033 $— $312,489 $309,544 
(in thousands) December 31, 2023
DescriptionTotalLevel 1Level 2Level 3
Financial assets:
Equity and other investment securities    
Investments in mutual funds and other securities$63,298 $44,839 $18,459 $— 
Equity securities held in rabbi trusts
13,697 13,697 — — 
Investment securities available for sale
U.S. Treasury and agencies1,478,392 373,664 1,104,728 — 
Obligations of states and political subdivisions1,072,105 — 1,072,105 — 
Mortgage-backed securities and collateralized mortgage obligations6,279,373 — 6,279,373 — 
Loans held for sale, at fair value30,715 — 30,715 — 
Loans and leases, at fair value275,140 — 275,140 — 
Residential mortgage servicing rights, at fair value109,243 — — 109,243 
Derivatives    
Interest rate futures3,745 — 3,745 — 
Interest rate forward sales commitments9 — 9 — 
Interest rate swaps33,874 — 33,874 — 
Foreign currency derivatives457 — 457 — 
Total assets measured at fair value$9,360,048 $432,200 $8,818,605 $109,243 
Financial liabilities:
Junior subordinated debentures, at fair value$316,440 $— $— $316,440 
Derivatives    
Interest rate lock commitments137 — — 137 
Interest rate forward sales commitments535 — 535 — 
Interest rate swaps260,064 — 260,064 — 
Foreign currency derivatives355 — 355 — 
Total liabilities measured at fair value$577,531 $— $260,954 $316,577 
Fair Value Measurement Inputs and Valuation Techniques
The following table provides a description of the valuation technique, significant unobservable inputs, and qualitative information about the unobservable inputs for the Company's assets and liabilities classified as Level 3 and measured at fair value on a recurring basis as of March 31, 2024: 
Financial InstrumentFair Value
(in thousands)		Valuation TechniqueUnobservable InputRange of InputsWeighted Average
Assets:
Residential mortgage servicing rights$110,444 Discounted cash flowConstant prepayment rate
6.07% - 27.52%
6.74%
  Discount rate
9.50% - 16.08%
10.24%
  
Interest rate lock commitments, net$16 Internal pricing modelPull-through rate
64.27% - 100.00%
85.71%
Liabilities:  
Junior subordinated debentures$309,544 Discounted cash flowCredit spread
2.11% - 6.13%
3.79%
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
The following table provides a reconciliation of assets and liabilities measured at fair value using significant unobservable inputs (Level 3) on a recurring basis during the periods indicated: 
Three Months EndedThree Months Ended
March 31, 2024March 31, 2023
(in thousands)Residential mortgage servicing rightsInterest rate lock commitments, netJunior subordinated debentures, at fair valueResidential mortgage servicing rightsInterest rate lock commitments, netJunior subordinated debentures, at fair value
Beginning balance$109,243 $(137)$(316,440)$185,017 $32 $(323,639)
Change included in earnings(36)(16)(7,583)(7,818)(32)(6,679)
Change in fair values included in comprehensive income/loss— — 6,453 — — 25,812 
Purchases and issuances1,237 47 — 1,601 338 — 
Sales and settlements— 122 8,026 — (201)6,785 
Ending balance$110,444 $16 $(309,544)$178,800 $137 $(297,721)
Change in unrealized gains or losses for the period included in earnings for assets and liabilities held at end of period$3,117 $16 $(7,583)$(2,937)$137 $(6,679)
Change in unrealized gains or losses for the period included in other comprehensive income for assets and liabilities held at end of period$— $— $6,453 $— $— $25,812 
Fair Value Measurements, Nonrecurring The following tables present information about the Company's assets and liabilities measured at fair value on a nonrecurring basis for which a nonrecurring change in fair value has been recorded during the reporting period. The amounts disclosed below represent the fair values at the time the nonrecurring fair value measurements were made, and not necessarily the fair value as of the dates reported upon. 
March 31, 2024
 (in thousands) 
TotalLevel 1Level 2Level 3
Loans and leases$1,059 $— $— $1,059 
Total assets measured at fair value on a nonrecurring basis$1,059 $— $— $1,059 

December 31, 2023
 (in thousands) 
TotalLevel 1Level 2Level 3
Loans and leases$5,036 $— $— $5,036 
Total assets measured at fair value on a nonrecurring basis$5,036 $— $— $5,036 
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings
The following table presents the losses resulting from nonrecurring fair value adjustments for the periods indicated:  

Three Months Ended
  (in thousands) 
March 31, 2024March 31, 2023
Loans and leases$28,174 $18,734 
Total losses from nonrecurring measurements$28,174 $18,734 
Fair Value Option, Disclosures
The following table presents the difference between the aggregate fair value and the aggregate unpaid principal balance of loans held for sale and loans held for investment accounted for under the fair value option as of the dates presented:
March 31, 2024December 31, 2023
(in thousands)Fair Value Aggregate Unpaid Principal BalanceFair Value Less Aggregate Unpaid Principal BalanceFair ValueAggregate Unpaid Principal BalanceFair Value Less Aggregate Unpaid Principal Balance
  Loans held for sale$47,201 $45,926 $1,275 $30,715 $29,629 $1,086 
  Loans $267,806 $315,435 $(47,629)$275,140 $320,397 $(45,257)