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Fair Value of Assets and Liabilities (Tables)
 12 Months Ended
Dec. 31, 2022
Fair Value Disclosures [Abstract]  
Summary 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, 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 $— 
 December 31, 2021
(In thousands)TotalLevel 1Level 2Level 3
Available-for-sale securities
U.S. Treasury$— $— $— $— 
U.S. government agencies52,507 — 52,507 — 
Municipal165,594 — 59,907 105,687 
Corporate notes95,704 — 95,704 — 
Mortgage-backed2,013,988 — 2,013,988 — 
Trading account securities1,061 — 1,061 — 
Equity securities with readily determinable fair value90,511 82,445 8,066 — 
Mortgage loans held-for-sale817,912 — 817,912 — 
Loans held-for-investment38,598 — 22,707 15,891 
MSRs147,571 — — 147,571 
Nonqualified deferred compensations assets16,240 — 16,240 — 
Derivative assets165,008 — 154,448 10,560 
Total$3,604,694 $82,445 $3,242,540 $279,709 
Derivative liabilities$123,000 $— $123,000 $— 
Summary of Changes in Level Three 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, 2022 and 2021 are summarized as follows:
(In thousands)MunicipalMortgage loans held-for-saleU.S. government agenciesLoans held-for-investmentMSRsDerivative assets
Balance at January 1, 2022
$105,687 $— $— $15,891 $147,571 $10,560 
Total net gains (losses) 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/(out of) Level 3— 94,838 — 110,770 — — 
Balance at December 31, 2022
$117,537 $48,655 $— $84,165 $230,225 $1,711 

(In thousands)MunicipalMortgage loans held-for-saleU.S. government agenciesLoans held-for-investmentMSRsDerivative assets
Balance at January 1, 2021
$109,876 $— $1,966 $10,280 $92,081 $48,091 
Total net gains (losses) included in:
Net income (1)
— — (4)(293)55,490 (37,531)
Other comprehensive income or loss(4,830)(24)— — — 
Purchases38,727 — — — — — 
Issuances— — — — — — 
Sales— — — — — — 
Settlements(38,086)— (1,938)(4,653)— — 
Net transfers into/(out of) Level 3— — — 10,557 — — 
Balance at December 31, 2021
$105,687 $— $— $15,891 $147,571 $10,560 
(1)Changes in the balance of mortgage loans held-for-sale, MSRs and derivative assets related to fair value adjustments are recorded as a component 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.
Summary 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, 2022.
 
 December 31, 2022
Year Ended
December 31, 2022
Fair Value Losses
Recognized, net
(In thousands)TotalLevel 1Level 2Level 3
Individually assessed loans - foreclosure probable and collateral-dependent$69,019 $— $— $69,019 $16,595 
Other real estate owned (1)
9,900 — — 9,900 435 
Total$78,919 $— $— $78,919 $17,030 
(1)Fair value losses recognized, net 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 Nonrecurring
The valuation techniques and significant unobservable inputs used to measure both recurring and non-recurring Level 3 fair value measurements at December 31, 2022 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$117,537 Bond pricingEquivalent ratingBBB-AA+N/AIncrease
Mortgage loans held-for-sale48,655 Discounted cash flowsDiscount rate6.21 %6.21 %Decrease
Credit discount
0% - 12%
0.33 %Decrease
Loans held-for-investment84,165 Discounted cash flowsDiscount rate
6.21% - 6.75%
6.26 %Decrease
Credit discount
0% - 12%
0.77 %Decrease
Constant prepayment rate (CPR) - current loans6.62 %6.62 %Decrease
Average life - delinquent loans (in years)
1.4 years - 10.0 years
5.8 yearsDecrease
MSRs230,225 Discounted cash flowsDiscount rate
7% - 24%
10.30 %Decrease
Constant prepayment rate (CPR)
0% - 100%
6.62 %Decrease
Cost of servicing
$70 - $200
$75 Decrease
Cost of servicing - delinquent
$200 - $1,000
$343 Decrease
Derivatives1,711 Discounted cash flowsPull-through rate
35% - 100%
86.12 %Increase
Measured at fair value on a non-recurring basis:
Individually assessed loans - foreclosure probable and collateral-dependent69,019 Appraisal valueAppraisal adjustment - cost of sale10 %10.00 %Decrease
Other real estate owned9,900 Appraisal valueAppraisal adjustment - cost of sale10 %10.00 %Decrease
Summary 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, 2022December 31, 2021
(In thousands)Carrying
Value		Fair
Value		Carrying
Value		Fair
Value
Financial Assets:
Cash and cash equivalents$490,966 $490,966 $411,205 $411,205 
Securities sold under agreements to repurchase with original maturities exceeding three months— — 700,000 700,000 
Interest-bearing deposits with banks1,988,719 1,988,719 5,372,603 5,372,603 
Available-for-sale securities3,243,017 3,243,017 2,327,793 2,327,793 
Held-to-maturity securities3,640,567 2,949,821 2,942,285 2,900,694 
Trading account securities1,127 1,127 1,061 1,061 
Equity securities with readily determinable fair value110,365 110,365 90,511 90,511 
FHLB and FRB stock, at cost224,759 224,759 135,378 135,378 
Brokerage customer receivables16,387 16,387 26,068 26,068 
Mortgage loans held-for-sale, at fair value299,935 299,935 817,912 817,912 
Loans held-for-investment, at fair value179,932 179,932 38,598 38,598 
Loans held-for-investment, at amortized cost39,016,553 38,018,678 34,750,506 35,297,878 
Nonqualified deferred compensation assets13,899 13,899 16,240 16,240 
Derivative assets296,848 296,848 165,008 165,008 
Accrued interest receivable and other379,719 379,719 268,921 268,921 
Total financial assets$49,902,793 $48,214,172 $48,064,089 $48,569,870 
Financial Liabilities:
Non-maturity deposits$38,167,409 $38,167,409 $38,126,796 $38,126,796 
Deposits with stated maturities4,735,135 4,085,058 3,968,789 3,965,372 
FHLB advances2,316,071 2,219,983 1,241,071 1,186,280 
Other borrowings596,614 569,342 494,136 494,670 
Subordinated notes437,392 409,395 436,938 472,684 
Junior subordinated debentures253,566 253,405 253,566 212,226 
Derivative liabilities338,078 338,078 123,000 123,000 
Accrued interest payable22,176 22,176 9,304 9,304 
Total financial liabilities$46,866,441 $46,064,846 $44,653,600 $44,590,332