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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis
The table below presents the carrying values of assets and liabilities measured at fair value on a recurring basis at December 31, 2023 and 2022. There were no transfers among levels during these years.

Fair Value Measurements Using
(In thousands)
Total Fair Value
Quoted Prices in Active Markets for Identical Assets
(Level 1)
Significant Other Observable Inputs (Level 2)
Significant Unobservable Inputs
 (Level 3)
December 31, 2023
Assets:
Residential mortgage loans held for sale$1,585 $— $1,585 $— 
Available for sale debt securities:
U.S. government and federal agency obligations816,514 816,514 — — 
Government-sponsored enterprise obligations43,962 — 43,962 — 
State and municipal obligations1,197,419 — 1,196,472 947 
Agency mortgage-backed securities3,901,346 — 3,901,346 — 
Non-agency mortgage-backed securities1,157,898 — 1,157,898 — 
Asset-backed securities2,107,485 — 2,107,485 — 
Other debt securities460,136 — 460,136 — 
Trading debt securities28,830 — 28,830 — 
Equity securities5,723 5,723 — — 
Private equity investments176,667 — — 176,667 
Derivatives *116,876 — 116,710 166 
Assets held in trust for deferred compensation plan20,538 20,538 — — 
Total assets10,034,979 842,775 9,014,424 177,780 
Liabilities:
Derivatives *37,899 — 37,704 195
Liabilities held in trust for deferred compensation plan20,538 20,538 — — 
Total liabilities$58,437 $20,538 $37,704 $195 
December 31, 2022
Assets:
Residential mortgage loans held for sale$— $— $— $— 
Available for sale debt securities:
U.S. government and federal agency obligations1,035,406 1,035,406 — — 
Government-sponsored enterprise obligations43,108 — 43,108 — 
State and municipal obligations1,767,109 — 1,765,268 1,841 
Agency mortgage-backed securities4,308,427 — 4,308,427 — 
Non-agency mortgage-backed securities1,211,607 — 1,211,607 — 
Asset-backed securities3,397,801 — 3,397,801 — 
Other debt securities474,858 — 474,858 — 
Trading debt securities43,523 — 43,523 — 
Equity securities6,210 6,210 — — 
Private equity investments178,127 — — 178,127 
Derivatives *60,492 — 60,458 34 
Assets held in trust for deferred compensation plan17,856 17,856 — — 
Total assets12,544,524 1,059,472 11,305,050 180,002 
Liabilities:
Derivatives *54,984 — 54,865 119 
Liabilities held in trust for deferred compensation plan17,856 17,856 — — 
Total liabilities$72,840 $17,856 $54,865 $119 
*The fair value of each class of derivative is shown in Note 19.
Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis
The changes in Level 3 assets and liabilities measured at fair value on a recurring basis are summarized as follows:


Fair Value Measurements Using Significant Unobservable Inputs
(Level 3)
(In thousands)
State and Municipal Obligations
Private Equity
Investments
Total
Year ended December 31, 2023:
Balance at January 1, 2023
$1,841 $178,127 $179,968 
Total gains or losses (realized/unrealized):
Included in earnings— 24,299 24,299 
Included in other comprehensive income *57 — 57 
Investment securities called
(1,000)— (1,000)
Discount accretion
49 — 49 
Purchases of private equity securities
— 15,220 15,220 
Sale / pay down of private equity securities
— (41,341)(41,341)
Capitalized interest/dividends
— 362 362 
Balance at December 31, 2023
$947 $176,667 $177,614 
Total gains or losses for the year included in earnings attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2023
$— $24,799 $24,799 
Total gains or losses for the year included in other comprehensive income attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2023
$35 $— $35 
Year ended December 31, 2022:
Balance at January 1, 2022
$1,984 $147,406 $149,390 
Total gains or losses (realized/unrealized):
Included in earnings— 43,833 43,833 
Included in other comprehensive income *(148)— (148)
Discount accretion5 — 5 
Purchases of private equity securities— 12,281 12,281 
Sale / pay down of private equity securities— (25,437)(25,437)
Capitalized interest/dividends— 44 44 
Balance at December 31, 2022
$1,841 $178,127 $179,968 
Total gains or losses for the year included in earnings attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2022
$— $35,333 35,333 
Total gains or losses for the year included in other comprehensive income attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2022
$(148)$— (148)
* Included in "net unrealized gains (losses) on securities" in the consolidated statements of comprehensive income.
Summary Of Gains And Losses On Level 3 Assets And Liabilities
Gains and losses on the Level 3 assets and liabilities in the table above are reported in the following income categories:

(In thousands)
Investment Securities Gains (Losses), Net
Year ended December 31, 2023:
Total gains or losses included in earnings$24,299 
Change in unrealized gains or losses relating to assets still held at December 31, 2023
$24,799 
Year ended December 31, 2022:
Total gains or losses included in earnings$43,833 
Change in unrealized gains or losses relating to assets still held at December 31, 2022
$35,333 
Summary Of Quantitative Information About Level 3 Fair Value Measurements
Level 3 Inputs
The Company's significant Level 3 measurements, which employ unobservable inputs that are readily quantifiable, pertain to investments in portfolio concerns held by the Company's private equity subsidiaries. Information about these inputs as of December 31, 2023 is presented in the table below.

Quantitative Information about Level 3 Fair Value MeasurementsWeighted
Valuation TechniqueUnobservable InputRangeAverage*
Private equity investmentsMarket comparable companiesEBITDA multiple4.0-6.05.2
* Unobservable inputs were weighted by the relative fair value of the instruments.
Schedule Of Fair Value Disclosures Measured On Nonrecurring Basis [Table Text Block]
Instruments Measured at Fair Value on a Nonrecurring Basis
For assets measured at fair value on a nonrecurring basis during 2023 and 2022, and still held as of December 31, 2023 and 2022, the following table provides the adjustments to fair value recognized during the respective periods, the level of valuation assumptions used to determine each adjustment, and the carrying value of the related individual assets or portfolios at December 31, 2023 and 2022.

Fair Value Measurements Using
(In thousands)
Fair Value
Quoted Prices in Active Markets for Identical Assets
 (Level 1)
Significant Other Observable Inputs (Level 2)
Significant Unobservable Inputs
 (Level 3)
Total Gains (Losses)
Balance at December 31, 2023
Collateral dependent loans
$1,517 $— $— $1,517 $(1,662)
Long-lived assets
2,662 — — 2,662 (193)
Balance at December 31, 2022
Collateral dependent loans
$1,988 $— $— $1,988 $(2,090)
Mortgage servicing rights
10,929 — — 10,929 304 
Long-lived assets
480 — — 480 (965)