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Investment Securities (Tables)

12 Months Ended

Dec. 31, 2024

Investments, Debt and Equity Securities [Abstract]

Amortized Cost, Unrealized Gains And Losses, And Fair Value Of Investment Securities

The following tables present the amortized cost, unrealized gains, unrealized losses, and approximate fair values of debt securities as of the dates presented:

			December 31, 2024
(in thousands)			Amortized Cost						Unrealized Gains						Unrealized Losses						Fair Value
Available for sale:
U.S. Treasury and agencies			$	1,495,542					$	1,092					$	(73,847)					$	1,422,787
Obligations of states and political subdivisions			1,055,535						2,779						(32,261)						1,026,053
Mortgage-backed securities and collateralized mortgage obligations			6,307,252						3,937						(485,414)						5,825,775
Total available for sale securities			$	8,858,329					$	7,808					$	(591,522)					$	8,274,615
Held to maturity:
Mortgage-backed securities and collateralized mortgage obligations			$	2,101					$	602					$	—					$	2,703
Total held to maturity securities			$	2,101					$	602					$	—					$	2,703

			December 31, 2023
(in thousands)			Amortized Cost						Unrealized Gains						Unrealized Losses						Fair Value
Available for sale:
U.S. Treasury and agencies			$	1,551,074					$	6,192					$	(78,874)					$	1,478,392
Obligations of states and political subdivisions			1,073,264						20,451						(21,610)						1,072,105
Mortgage-backed securities and collateralized mortgage obligations			6,638,439						28,558						(387,624)						6,279,373
Total available for sale securities			$	9,262,777					$	55,201					$	(488,108)					$	8,829,870
Held to maturity:
Mortgage-backed securities and collateralized mortgage obligations			$	2,300					$	725					$	—					$	3,025
Total held to maturity securities			$	2,300					$	725					$	—					$	3,025

Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value

The following tables present debt securities that were in an unrealized loss position as of the dates presented, based on the length of time individual securities have been in an unrealized loss position:

			December 31, 2024
			Less than 12 Months												12 Months or Longer												Total
(in thousands)			Fair Value						Unrealized Losses						Fair Value						Unrealized Losses						Fair Value						Unrealized Losses
Available for sale:
U.S. Treasury and agencies			$	185,042					$	(2,770)					$	794,521					$	(71,077)					$	979,563					$	(73,847)
Obligations of states and political subdivisions			539,440						(8,036)						224,973						(24,225)						764,413						(32,261)
Mortgage-backed securities and collateralized mortgage obligations			3,398,609						(78,817)						1,830,720						(406,597)						5,229,329						(485,414)
Total temporarily impaired securities			$	4,123,091					$	(89,623)					$	2,850,214					$	(501,899)					$	6,973,305					$	(591,522)

			December 31, 2023
			Less than 12 Months												12 Months or Longer												Total
(in thousands)			Fair Value						Unrealized Losses						Fair Value						Unrealized Losses						Fair Value						Unrealized Losses
Available for sale:
U.S. Treasury and agencies			$	99,898					$	(1,074)					$	822,245					$	(77,800)					$	922,143					$	(78,874)
Obligations of states and political subdivisions			103,256						(580)						169,231						(21,030)						272,487						(21,610)
Mortgage-backed securities and collateralized mortgage obligations			1,089,640						(10,355)						1,817,768						(377,269)						2,907,408						(387,624)
Total temporarily impaired securities			$	1,292,794					$	(12,009)					$	2,809,244					$	(476,099)					$	4,102,038					$	(488,108)

Schedule Of Maturities Of Investment Securities

The following table presents the contractual maturities of debt securities as of December 31, 2024:

			Available For Sale												Held To Maturity
(in thousands)			Amortized Cost						Fair Value						Amortized Cost						Fair Value
Due within one year			$	211,418					$	211,457					$	—					$	—
Due after one year through five years			2,732,275						2,670,145						3						3
Due after five years through ten years			1,664,293						1,587,143						1						559
Due after ten years			4,250,343						3,805,870						2,097						2,141
Total debt securities			$	8,858,329					$	8,274,615					$	2,101					$	2,703

Investment Securities Pledged To Secure Borrowings And Public Deposits

The following table presents, as of December 31, 2024, investment securities which were pledged to secure borrowings, public deposits, repurchase agreements, and for other purposes as permitted or required by law: 

(in thousands)			Amortized Cost						Fair Value
To state and local governments to secure public deposits			$	1,983,773					$	1,790,034
To secure repurchase agreements			269,985						251,540
Other securities pledged			3,482,213						3,204,788
Total pledged securities			$	5,735,971					$	5,246,362

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- Definition

Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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