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Fair Value Measurement (Tables)
 9 Months Ended
Sep. 30, 2023
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 in the Condensed Consolidated Balance Sheets:  
September 30, 2023December 31, 2022
 (in thousands)LevelCarrying ValueFair ValueCarrying ValueFair Value
Financial assets:    
Cash and cash equivalents1$2,403,695 $2,403,695 $1,294,643 $1,294,643 
Equity and other investment securities1,273,638 73,638 72,959 72,959 
Investment securities available for sale1,28,503,986 8,503,986 3,196,166 3,196,166 
Investment securities held to maturity32,344 3,058 2,476 3,197 
Loans held for sale260,313 60,313 71,647 71,647 
Loans and leases, net
2,336,754,038 35,285,963 25,854,846 24,399,370 
Restricted equity securities1168,524 168,524 47,144 47,144 
Residential mortgage servicing rights3117,640 117,640 185,017 185,017 
Bank owned life insurance1648,232 648,232 331,759 331,759 
Derivatives2,3769 769 15,444 15,444 
Financial liabilities:    
Demand, money market, and savings deposits1$35,799,702 $35,799,702 $24,355,381 $24,355,381 
Time deposits25,824,666 5,783,410 2,710,231 2,667,535 
Securities sold under agreements to repurchase2258,383 258,383 308,769 308,769 
Borrowings23,985,000 3,984,939 906,175 905,591 
Junior subordinated debentures, at fair value3331,545 331,545 323,639 323,639 
Junior and other subordinated debentures, at amortized cost3107,952 91,864 87,813 80,922 
Derivatives2,3403,821 403,821 271,205 271,205 
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) 
September 30, 2023
DescriptionTotalLevel 1Level 2Level 3
Financial assets:
Equity and other investment securities    
Investments in mutual funds and other securities$60,705 $42,246 $18,459 $— 
Equity securities held in rabbi trusts12,933 12,933 — — 
Investment securities available for sale    
U.S. Treasury and agencies1,436,552 366,216 1,070,336 — 
Obligations of states and political subdivisions998,798 — 998,798 — 
Mortgage-backed securities and collateralized mortgage obligations6,068,636 — 6,068,636 — 
Loans held for sale, at fair value60,313 — 60,313 — 
Loans and leases, at fair value257,911 — 257,911 — 
Residential mortgage servicing rights, at fair value117,640 — — 117,640 
Derivatives    
Interest rate forward sales commitments441 — 441 — 
Foreign currency derivatives328 — 328 — 
Total assets measured at fair value$9,014,257 $421,395 $8,475,222 $117,640 
Financial liabilities:
Junior subordinated debentures, at fair value$331,545 $— $— $331,545 
Derivatives    
Interest rate lock commitments427 — — 427 
Interest rate futures1,630 — 1,630 — 
Interest rate forward sales commitments13 — 13 — 
Interest rate swaps401,515 — 401,515 — 
Foreign currency derivatives236 — 236 — 
Total liabilities measured at fair value$735,366 $— $403,394 $331,972 
(in thousands) December 31, 2022
DescriptionTotalLevel 1Level 2Level 3
Financial assets:
Equity and other investment securities    
Investments in mutual funds and other securities$61,593 $44,256 $17,337 $— 
Equity securities held in rabbi trusts
11,366 11,366 — — 
Investment securities available for sale
U.S. Treasury and agencies936,174 225,853 710,321 — 
Obligations of states and political subdivisions269,800 — 269,800 — 
Mortgage-backed securities and collateralized mortgage obligations1,990,192 — 1,990,192 — 
Loans held for sale, at fair value71,647 — 71,647 — 
Loans and leases, at fair value285,581 — 285,581 — 
Residential mortgage servicing rights, at fair value185,017 — — 185,017 
Derivatives    
Interest rate lock commitments50 — — 50 
Interest rate forward sales commitments512 — 512 — 
Interest rate swaps14,657 — 14,657 — 
Foreign currency derivatives225 — 225 — 
Total assets measured at fair value$3,826,814 $281,475 $3,360,272 $185,067 
Financial liabilities:
Junior subordinated debentures, at fair value$323,639 $— $— $323,639 
Derivatives    
Interest rate lock commitments18 — — 18 
Interest rate futures392 — 392 — 
Interest rate forward sales commitments601 — 601 — 
Interest rate swaps270,009 — 270,009 — 
Foreign currency derivatives185 — 185 — 
Total liabilities measured at fair value$594,844 $— $271,187 $323,657 
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 at September 30, 2023: 
Financial InstrumentFair Value
(in thousands)		Valuation TechniqueUnobservable InputRange of InputsWeighted Average
Assets:
Residential mortgage servicing rights$117,640 Discounted cash flow  
  Constant prepayment rate
6.07% - 26.05%
6.49%
  Discount rate
9.50% - 16.04%
10.23%
Liabilities:
Interest rate lock commitments, net$427 Internal pricing model
Pull-through rate
73.20% - 100.00%
89.53%
Junior subordinated debentures$331,545 Discounted cash flow  
  Credit spread
1.59% - 4.94%
3.18%
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
September 30, 2023September 30, 2022
(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$172,929 $(51)$(312,872)$179,558 $(117)$(321,268)
Change included in earnings507 (122)(7,603)11,425 (1,072)(4,348)
Change in fair values included in comprehensive income/loss— — (19,677)— — (4,043)
Purchases and issuances1,658 (685)— 5,194 1,376 — 
Sales and settlements(57,454)431 8,607 — (2,453)3,915 
Ending balance$117,640 $(427)$(331,545)$196,177 $(2,266)$(325,744)
Change in unrealized gains or losses for the period included in earnings for assets and liabilities held at end of period$5,308 $(427)$(7,603)$16,403 $(2,266)$(4,348)
Change in unrealized gains or losses for the period included in other comprehensive income for assets and liabilities held at end of period$— $— $(19,677)$— $— $(4,043)
Nine Months EndedNine Months Ended
September 30, 2023September 30, 2022
(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$185,017 $32 $(323,639)$123,615 $4,641 $(293,081)
Change included in earnings(14,350)(288)(21,331)52,165 (7,779)(9,941)
Change in fair values included in comprehensive income/loss— — (8,503)— — (31,810)
Purchases and issuances4,427 (663)— 20,397 9,074 — 
Sales and settlements(57,454)492 21,928 — (8,202)9,088 
Ending balance$117,640 $(427)$(331,545)$196,177 $(2,266)$(325,744)
Change in unrealized gains or losses for the period included in earnings for assets held at end of period$129 $(427)$(21,331)$67,451 $(2,266)$(9,941)
Change in unrealized gains or losses for the period included in other comprehensive income for assets held at end of period$— $— $(8,503)$— $— $(31,810)
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. 
September 30, 2023
 (in thousands) 
TotalLevel 1Level 2Level 3
Loans and leases$2,159 $— $— $2,159 
Total assets measured at fair value on a nonrecurring basis$2,159 $— $— $2,159 

December 31, 2022
 (in thousands) 
TotalLevel 1Level 2Level 3
Loans and leases$3,216 $— $— $3,216 
Total assets measured at fair value on a nonrecurring basis$3,216 $— $— $3,216 
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 EndedNine Months Ended
  (in thousands) 
September 30, 2023September 30, 2022September 30, 2023September 30, 2022
Loans and leases$25,729 $8,621 $74,010 $25,153 
Total losses from nonrecurring measurements$25,729 $8,621 $74,010 $25,153 
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:
September 30, 2023December 31, 2022
(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$30,982 $30,673 $309 $71,647 $70,219 $1,428 
  Loans $257,911 $322,523 $(64,612)$285,581 $333,469 $(47,888)