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Fair Value of Assets and Liabilities (Tables)
 12 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
Schedule of Balances of Assets and Liabilities Measured at Fair Value on a Recurring Basis
The following tables present the balances of assets and liabilities measured at fair value on a recurring basis for the periods presented:

 December 31, 2023
(In thousands)TotalLevel 1Level 2Level 3
Available-for-sale securities
U.S. Treasury$6,968 $6,968 $— $— 
U.S. government agencies45,124 — 45,124 — 
Municipal140,958 — 54,721 86,237 
Corporate notes76,531 — 76,531 — 
Mortgage-backed3,233,334 — 3,233,334 — 
Trading account securities4,707 — 4,707 — 
Equity securities with readily determinable fair value139,268 131,202 8,066 — 
Mortgage loans held-for-sale292,722 — 265,887 26,835 
Loans held-for-investment155,261 — 94,591 60,670 
MSRs192,456 — — 192,456 
Nonqualified deferred compensations assets15,238 — 15,238 — 
Derivative assets275,726 — 271,216 4,510 
Total$4,578,293 $138,170 $4,069,415 $370,708 
Derivative liabilities$267,255 $— $267,255 $— 
 December 31, 2022
(In thousands)TotalLevel 1Level 2Level 3
Available-for-sale securities
U.S. Treasury$14,948 $14,948 $— $— 
U.S. government agencies74,222 — 74,222 — 
Municipal168,655 — 51,118 117,537 
Corporate notes85,705 — 85,705 — 
Mortgage-backed2,899,487 — 2,899,487 — 
Trading account securities1,127 — 1,127 — 
Equity securities with readily determinable fair value110,365 102,299 8,066 — 
Mortgage loans held-for-sale299,935 — 251,280 48,655 
Loans held-for-investment179,932 — 95,767 84,165 
MSRs230,225 — — 230,225 
Nonqualified deferred compensations assets13,899 — 13,899 — 
Derivative assets296,848 — 295,137 1,711 
Total$4,375,348 $117,247 $3,775,808 $482,293 
Derivative liabilities$338,078 $— $338,078 $— 
Schedule of Changes In Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis
The changes in Level 3 assets measured at fair value on a recurring basis during the years ended December 31, 2023 and 2022 are summarized as follows:
(In thousands)MunicipalMortgage loans held-for-saleLoans held-for-investmentMSRsDerivative assets
Balance at January 1, 2023
$117,537 $48,655 $84,165 $230,225 $1,711 
Total net gains (losses) included in:
Net income (1)
— 1,960 (103)(7,599)2,799 
Other comprehensive income or loss(7,152)— — — — 
Purchases36,688 — — — — 
Issuances— — — — — 
Sales— — — (30,170)— 
Settlements(60,836)(75,342)(69,218)— — 
Net transfers into Level 3— 51,562 45,826 — — 
Balance at December 31, 2023
$86,237 $26,835 $60,670 $192,456 $4,510 

(In thousands)MunicipalMortgage loans held-for-saleLoans held-for-investmentMSRsDerivative assets
Balance at January 1, 2022
$105,687 $— $15,891 $147,571 $10,560 
Total net (losses) gains included in:
Net income (1)
— (2,749)(4,177)82,654 (8,849)
Other comprehensive income or loss(8,766)— — — — 
Purchases60,546 — — — — 
Issuances— — — — — 
Sales— — — — — 
Settlements(39,930)(43,434)(38,319)— — 
Net transfers into Level 3— 94,838 110,770 — — 
Balance at December 31, 2022
$117,537 $48,655 $84,165 $230,225 $1,711 
(1)Changes in the balance of mortgage loans held-for-sale, MSRs and derivative assets related to fair value adjustments are recorded as components of mortgage banking revenue. Changes in the balance of loans held-for-investment related to fair value adjustments are recorded as other non-interest income.
Schedule of Assets Measured at Fair Value on a Nonrecurring Basis For assets measured at fair value on a non-recurring basis that were still held in the balance sheet at the end of the period, the following table provides the carrying value of the related individual assets or portfolios at December 31, 2023.
 
 December 31, 2023
Year Ended
December 31, 2023
Fair Value Losses
Recognized, net
(In thousands)TotalLevel 1Level 2Level 3
Individually assessed loans - foreclosure probable and collateral-dependent$91,153 $— $— $91,153 $29,194 
Other real estate owned (1)
13,309 — — 13,309 104 
Total$104,462 $— $— $104,462 $29,298 
(1)Net fair value losses recognized on other real estate owned include valuation adjustments and charge-offs during the respective period.
Schedule of Valuation Techniques and Significant Unobservable Inputs Used to Measure Both Recurring and Non Recurring
The valuation techniques and significant unobservable inputs used to measure both recurring and non-recurring Level 3 fair value measurements at December 31, 2023 were as follows:
(Dollars in thousands)Fair ValueValuation MethodologySignificant Unobservable InputRange
of Inputs		Weighted
Average
of Inputs		Impact to valuation from an increased 
or higher input value
Measured at fair value on a recurring basis:
Municipal securities$86,237 Bond pricingEquivalent ratingBBB-AA+N/AIncrease
Mortgage loans held-for-sale26,835 Discounted cash flowsDiscount rate6.11 %6.11 %Decrease
Credit discount
0% - 11%
0.40 %Decrease
Loans held-for-investment60,670 Discounted cash flowsDiscount rate
6.11% - 7.00%
6.18 %Decrease
Credit discount
0% - 29%
0.96 %Decrease
Constant prepayment rate (CPR) - current loans7.91 %7.91 %Decrease
Average life - delinquent loans (in years)
1.1 years - 10.6 years
6.0 yearsDecrease
MSRs192,456 Discounted cash flowsDiscount rate
6% - 25%
11.00 %Decrease
Constant prepayment rate (CPR)
0% - 90%
7.91 %Decrease
Cost of servicing
$70 - $200
$77 Decrease
Cost of servicing - delinquent
$200 - $1,000
$393 Decrease
Derivatives4,510 Discounted cash flowsPull-through rate
6% - 100%
73.96 %Increase
Measured at fair value on a non-recurring basis:
Individually assessed loans - foreclosure probable and collateral-dependent91,153 Appraisal valueAppraisal adjustment - cost of sale10 %10.00 %Decrease
Other real estate owned13,309 Appraisal valueAppraisal adjustment - cost of sale10 %10.00 %Decrease
Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments The table below presents the carrying amounts and estimated fair values of the Company’s financial instruments as of the dates shown:
 December 31, 2023December 31, 2022
(In thousands)Carrying
Value		Fair
Value		Carrying
Value		Fair
Value
Financial Assets:
Cash and cash equivalents$423,464 $423,464 $490,966 $490,966 
Interest-bearing deposits with banks2,084,323 2,084,323 1,988,719 1,988,719 
Available-for-sale securities3,502,915 3,502,915 3,243,017 3,243,017 
Held-to-maturity securities3,856,916 3,215,468 3,640,567 2,949,821 
Trading account securities4,707 4,707 1,127 1,127 
Equity securities with readily determinable fair value139,268 139,268 110,365 110,365 
FHLB and FRB stock, at cost205,003 205,003 224,759 224,759 
Brokerage customer receivables10,592 10,592 16,387 16,387 
Mortgage loans held-for-sale, at fair value292,722 292,722 299,935 299,935 
Loans held-for-investment, at fair value155,261 155,261 179,932 179,932 
Loans held-for-investment, at amortized cost41,976,570 41,090,010 39,016,553 38,018,678 
Nonqualified deferred compensation assets15,238 15,238 13,899 13,899 
Derivative assets275,726 275,726 296,848 296,848 
Accrued interest receivable and other477,832 477,832 379,719 379,719 
Total financial assets$53,420,537 $51,892,529 $49,902,793 $48,214,172 
Financial Liabilities:
Non-maturity deposits$38,772,098 $38,772,098 $38,167,409 $38,167,409 
Deposits with stated maturities6,625,072 6,603,746 4,735,135 4,085,058 
FHLB advances2,326,071 2,367,107 2,316,071 2,219,983 
Other borrowings645,813 643,755 596,614 569,342 
Subordinated notes437,866 413,501 437,392 409,395 
Junior subordinated debentures253,566 253,579 253,566 253,405 
Derivative liabilities267,255 267,255 338,078 338,078 
Accrued interest payable51,116 51,116 22,176 22,176 
Total financial liabilities$49,378,857 $49,372,157 $46,866,441 $46,064,846