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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2025
Fair Value Measurements [Abstract]  
Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis
The table below presents the September 30, 2025 and December 31, 2024 carrying values of assets and liabilities measured at fair value on a recurring basis. There were no transfers among levels during the first nine months of 2025 or the year ended December 31, 2024.

Fair Value Measurements Using
(In thousands)Total Fair ValueQuoted Prices in Active Markets for Identical Assets
(Level 1)		Significant Other Observable Inputs
(Level 2)		Significant Unobservable Inputs
(Level 3)
September 30, 2025
Assets:
  Residential mortgage loans held for sale$2,163 $— $2,163 $— 
  Available for sale debt securities:
     U.S. government and federal agency obligations2,925,238 2,925,238 — — 
     Government-sponsored enterprise obligations44,746 — 44,746 — 
     State and municipal obligations695,698 — 694,738 960 
     Agency mortgage-backed securities3,291,338 — 3,291,338 — 
     Non-agency mortgage-backed securities452,424 — 452,424 — 
     Asset-backed securities1,395,349 — 1,395,349 — 
     Other debt securities193,793 — 193,793 — 
  Trading debt securities56,282 13,082 43,200 — 
  Equity securities43,365 43,365 — — 
  Private equity investments181,505 — — 181,505 
  Derivatives *61,760 — 61,566 194 
  Assets held in trust for deferred compensation plan22,789 22,789 — — 
  Total assets9,366,450 3,004,474 6,179,317 182,659 
Liabilities:
  Derivatives *
21,248 — 21,143 105 
Liabilities held in trust for deferred compensation plan
22,789 22,789 — — 
  Total liabilities$44,037 $22,789 $21,143 $105 
December 31, 2024
Assets:
  Residential mortgage loans held for sale$2,981 $— $2,981 $— 
  Available for sale debt securities:
     U.S. government and federal agency obligations2,555,252 2,555,252 — — 
     Government-sponsored enterprise obligations42,849 — 42,849 — 
     State and municipal obligations742,891 — 741,927 964 
     Agency mortgage-backed securities3,444,891 — 3,444,891 — 
     Non-agency mortgage-backed securities568,689 — 568,689 — 
     Asset-backed securities1,557,015 — 1,557,015 — 
     Other debt securities225,266 — 225,266 — 
  Trading debt securities38,034 10,219 27,815 — 
  Equity securities48,359 48,359 — — 
  Private equity investments184,386 — — 184,386 
  Derivatives *62,648 — 62,555 93 
  Assets held in trust for deferred compensation plan21,849 21,849 — — 
  Total assets9,495,110 2,635,679 6,673,988 185,443 
Liabilities:
  Derivatives *
26,963 — 26,905 58 
Liabilities held in trust for deferred compensation plan
21,849 21,849 — — 
  Total liabilities$48,812 $21,849 $26,905 $58 
* The fair value of each class of derivative is shown in Note 11.
Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis
The changes in the Company's 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
For the three months ended September 30, 2025
Balance June 30, 2025
$950 $174,070 $175,020 
Total gains (losses) realized/unrealized:
Included in earnings— 7,953 7,953 
Included in other comprehensive income *10 — 10 
Purchases of private equity investments— 560 560 
Sale/pay down of private equity investments— (1,096)(1,096)
Capitalized interest/dividends— 18 18 
Balance September 30, 2025$960 $181,505 $182,465 
Total gains (losses) for the three months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2025
$— $7,953 $7,953 
*Total gains (losses) for the three months included in other comprehensive income attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2025
$10 $— $10 
For the nine months ended September 30, 2025
Balance January 1, 2025
$964 $184,386 $185,350 
Total gains (losses) realized/unrealized:
Included in earnings— 3,842 3,842 
Included in other comprehensive income *(6)— (6)
Discount accretion2 — 2 
Purchases of private equity investments— 6,986 6,986 
Sale/pay down of private equity investments— (13,761)(13,761)
Capitalized interest/dividends— 52 52 
Balance September 30, 2025$960 $181,505 $182,465 
Total gains (losses) for the nine months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2025
$— $4,641 $4,641 
*Total gains (losses) for the nine months included in other comprehensive income attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2025
$(6)$— $(6)
Fair Value Measurements Using
Significant Unobservable Inputs
(Level 3)


(In thousands)
State and Municipal Obligations
Private Equity
Investments
Total
For the three months ended September 30, 2024
Balance June 30, 2024
$953 $178,321 $179,274 
Total gains (losses) realized/unrealized:
Included in earnings— 7,428 7,428 
Included in other comprehensive income *(2)— (2)
Purchases of private equity investments— 375 375 
Sale/pay down of private equity investments— (15,139)(15,139)
Capitalized interest/dividends— (12)(12)
Balance at September 30, 2024$951 $170,973 $171,924 
Total gains (losses) for the three months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2024
$— $7,428 $7,428 
*Total gains (losses) for the three months included in other comprehensive income attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2024
$(2)$— $(2)
For the nine months ended September 30, 2024
Balance January 1, 2024
$947 $176,667 $177,614 
Total gains (losses) realized/unrealized:
Included in earnings— 20,205 20,205 
Included in other comprehensive income *3 — 3 
Discount accretion1 — 1 
Purchases of private equity investments— 11,322 11,322 
Sale/pay down of private equity investments— (37,103)(37,103)
Capitalized interest/dividends— (118)(118)
Balance at September 30, 2024$951 $170,973 $171,924 
Total gains (losses) for the nine months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2024
$— $10,480 $10,480 
*Total gains (losses) for the nine months included in other comprehensive income attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2024
$3 $— $3 
* Included in "net unrealized gains (losses) on available for sale debt securities" in the consolidated statements of comprehensive income.
Summary Of Gains And Losses On Level 3 Assets And Liabilities
Gains and losses included in earnings for the Company's Level 3 assets and liabilities in the previous table are reported in the following line items in the consolidated statements of income:

(In thousands)Investment Securities Gains (Losses), Net
For the three months ended September 30, 2025
Total gains or losses included in earnings$7,953 
Change in unrealized gains or losses relating to assets still held at September 30, 2025
$7,953 
For the nine months ended September 30, 2025
Total gains or losses included in earnings $3,842 
Change in unrealized gains or losses relating to assets still held at September 30, 2025
$4,641 
For the three months ended September 30, 2024
Total gains or losses included in earnings $7,428 
Change in unrealized gains or losses relating to assets still held at September 30, 2024
$7,428 
For the nine months ended September 30, 2024
Total gains or losses included in earnings$20,205 
Change in unrealized gains or losses relating to assets still held at September 30, 2024
$10,480 
Summary Of Quantitative Information About Level 3 Fair Value Measurements
The Company's Level 3 measurements at September 30, 2025, 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 is presented in the table below.

Quantitative Information about Level 3 Fair Value MeasurementsWeighted
Valuation TechniqueUnobservable InputRangeAverage*
Private equity investmentsMarket comparable companiesEBITDA multiple3.8-6.05.0
* Unobservable inputs were weighted by the relative fair value of the instruments.
Schedule Of Fair Value Disclosures Measured On Nonrecurring Basis [Table Text Block]
For assets measured at fair value on a nonrecurring basis during the first nine months of 2025 and 2024, and still held as of September 30, 2025 and 2024, the following table provides the adjustments to fair value recognized during the respective periods, the level of valuation inputs used to determine each adjustment, and the carrying value of the related individual assets or portfolios at September 30, 2025 and 2024.

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) Recognized During the Nine Months Ended September 30
September 30, 2025
Collateral dependent loans$249 $— $— $249 $(435)
 Long-lived assets301 — — 301 (99)
September 30, 2024
Collateral dependent loans$14,872 $— $— $14,872 $(2,646)