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Fair Value Measurement (Tables)
 9 Months Ended
Sep. 30, 2022
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 September 30, 2022 and December 31, 2021, whether or not recognized or recorded at fair value in the Condensed Consolidated Balance Sheets:  
September 30, 2022December 31, 2021
 (in thousands)LevelCarrying ValueFair ValueCarrying ValueFair Value
Financial assets:    
Cash and cash equivalents1$1,553,859 $1,553,859 $2,761,621 $2,761,621 
Equity and other investment securities1,272,277 72,277 81,214 81,214 
Investment securities available for sale1,23,136,391 3,136,391 3,870,435 3,870,435 
Investment securities held to maturity32,547 3,287 2,744 3,514 
Loans held for sale2148,275 148,275 353,105 353,105 
Loans and leases, net
2,325,224,886 24,201,550 22,304,768 22,356,321 
Restricted equity securities140,993 40,993 10,916 10,916 
Residential mortgage servicing rights3196,177 196,177 123,615 123,615 
Bank owned life insurance1329,699 329,699 327,745 327,745 
Derivatives2,314,829 14,829 177,423 177,423 
Financial liabilities:    
Deposits1,2$26,817,107 $26,780,203 $26,594,685 $26,593,521 
Securities sold under agreements to repurchase2383,569 383,569 492,247 492,247 
Borrowings2756,214 755,820 6,329 7,073 
Junior subordinated debentures, at fair value3325,744 325,744 293,081 293,081 
Junior subordinated debentures, at amortized cost387,870 80,337 88,041 75,199 
Derivatives2,3295,222 295,222 9,675 9,675 
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 September 30, 2022 and December 31, 2021: 
(in thousands) 
September 30, 2022
DescriptionTotalLevel 1Level 2Level 3
Financial assets:
Equity and other investment securities    
Investments in mutual funds and other securities$61,309 $43,972 $17,337 $— 
Equity securities held in rabbi trusts10,968 10,968 — — 
Investment securities available for sale    
U.S. Treasury and agencies830,813 125,510 705,303 — 
Obligations of states and political subdivisions269,904 — 269,904 — 
Mortgage-backed securities and collateralized mortgage obligations2,035,674 — 2,035,674 — 
Loans held for sale, at fair value148,275 — 148,275 — 
Loans and leases, at fair value284,900 — 284,900 — 
Residential mortgage servicing rights, at fair value 196,177 — — 196,177 
Derivatives    
Interest rate lock commitments24 — — 24 
Interest rate forward sales commitments9,740 — 9,740 — 
Interest rate swaps4,479 — 4,479 — 
Foreign currency derivatives586 — 586 — 
Total assets measured at fair value$3,852,849 $180,450 $3,476,198 $196,201 
Financial liabilities:
Junior subordinated debentures, at fair value$325,744 $— $— $325,744 
Derivatives    
Interest rate lock commitments2,290 — — 2,290 
Interest rate futures10,359 — 10,359 — 
Interest rate forward sales commitments5 — 5 — 
Interest rate swaps282,087 — 282,087 — 
Foreign currency derivatives481 — 481 — 
Total liabilities measured at fair value$620,966 $— $292,932 $328,034 
(in thousands) December 31, 2021
DescriptionTotalLevel 1Level 2Level 3
Financial assets:
Equity and other investment securities    
Investments in mutual funds and other securities$68,692 $51,355 $17,337 $— 
Equity securities held in rabbi trusts
12,522 12,522 — — 
Investment securities available for sale
U.S. Treasury and agencies918,053 89,038 829,015 — 
Obligations of states and political subdivisions330,784 — 330,784 — 
Mortgage-backed securities and collateralized mortgage obligations2,621,598 — 2,621,598 — 
Loans held for sale, at fair value353,105 — 353,105 — 
Loans and leases, at fair value345,634 — 345,634 — 
Residential mortgage servicing rights, at fair value123,615 — — 123,615 
Derivatives    
Interest rate lock commitments4,641 — — 4,641 
Interest rate forward sales commitments615 — 615 — 
Interest rate swaps171,827 — 171,827 — 
Foreign currency derivatives340 — 340 — 
Total assets measured at fair value$4,951,426 $152,915 $4,670,255 $128,256 
Financial liabilities:
Junior subordinated debentures, at fair value$293,081 $— $— $293,081 
Derivatives    
Interest rate forward sales commitments699 — 699 — 
Interest rate swaps8,671 — 8,671 — 
Foreign currency derivatives305 — 305 — 
Total liabilities measured at fair value$302,756 $— $9,675 $293,081 
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, 2022: 
Financial InstrumentFair Value
(in thousands)		Valuation TechniqueUnobservable InputRange of InputsWeighted Average
Assets:
Residential mortgage servicing rights$196,177 Discounted cash flow  
  Constant prepayment rate
6.06% - 20.75%
6.34%
  Discount rate
9.50% - 15.94%
10.05%
Liabilities:
Interest rate lock commitments, net$2,266 Internal pricing model
Pull-through rate
12.53% - 100.00%
91.86%
Junior subordinated debentures$325,744 Discounted cash flow  
  Credit spread
1.93% - 3.77%
2.93%
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 three and nine months ended September 30, 2022 and 2021: 
Three Months EndedThree Months Ended
September 30, 2022September 30, 2021
(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$179,558 $(117)$(321,268)$102,699 $13,210 $(287,723)
Change included in earnings11,425 (1,072)(4,348)(5,315)1,301 (2,344)
Change in fair values included in comprehensive income/loss— — (4,043)— — (11,946)
Purchases and issuances5,194 1,376 — 8,450 16,007 — 
Sales and settlements— (2,453)3,915 — (22,260)2,505 
Ending balance$196,177 $(2,266)$(325,744)$105,834 $8,258 $(299,508)
Change in unrealized gains or losses for the period included in earnings for assets and liabilities held at end of period$16,403 $(2,266)$(4,348)$(634)$8,258 $(2,344)
Change in unrealized gains or losses for the period included in other comprehensive income for assets and liabilities held at end of period$— $— $(4,043)$— $— $(11,946)
Nine Months EndedNine Months Ended
September 30, 2022September 30, 2021
(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$123,615 $4,641 $(293,081)$92,907 $28,144 $(255,217)
Change included in earnings52,165 (7,779)(9,941)(17,918)199 (7,087)
Change in fair values included in comprehensive income/loss— — (31,810)— — (44,504)
Purchases and issuances20,397 9,074 — 30,845 67,730 — 
Sales and settlements— (8,202)9,088 — (87,815)7,300 
Ending balance$196,177 $(2,266)$(325,744)$105,834 $8,258 $(299,508)
Change in unrealized gains or losses for the period included in earnings for assets held at end of period$67,451 $(2,266)$(9,941)$(4,326)$8,258 $(7,087)
Change in unrealized gains or losses for the period included in other comprehensive income for assets held at end of period$— $— $(31,810)$— $— $(44,504)
Fair Value Measurements, Nonrecurring The following table presents 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, 2022
 (in thousands)TotalLevel 1Level 2Level 3
Loans and leases$1,845 $— $— $1,845 
Total assets measured at fair value on a nonrecurring basis$1,845 $— $— $1,845 
December 31, 2021
 (in thousands) 
TotalLevel 1Level 2Level 3
Loans and leases$4,129 $— $— $4,129 
Total assets measured at fair value on a nonrecurring basis$4,129 $— $— $4,129 
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 three and nine months ended September 30, 2022 and 2021:  

Three Months EndedNine Months Ended
  (in thousands) 
September 30, 2022September 30, 2021September 30, 2022September 30, 2021
Loans and leases$8,621 $8,470 $25,153 $43,480 
Total losses from nonrecurring measurements$8,621 $8,470 $25,153 $43,480 
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 September 30, 2022 and December 31, 2021:
September 30, 2022December 31, 2021
(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$148,275 $150,794 $(2,519)$353,105 $341,008 $12,097 
  Loans $284,900 $336,980 $(52,080)$345,634 $335,058 $10,576