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Investment Securities (Tables)
 3 Months Ended
Mar. 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:
March 31, 2024
 (in thousands) Amortized CostUnrealized GainsUnrealized LossesFair Value
Available for sale:    
U.S. Treasury and agencies$1,552,240 $1,132 $(85,979)$1,467,393 
Obligations of states and political subdivisions1,068,290 8,788 (25,149)1,051,929 
Mortgage-backed securities and collateralized mortgage obligations
6,551,596 2,386 (456,759)6,097,223 
Total available for sale securities$9,172,126 $12,306 $(567,887)$8,616,545 
Held to maturity:    
Mortgage-backed securities and collateralized mortgage obligations
$2,247 $692 $— $2,939 
Total held to maturity securities$2,247 $692 $— $2,939 

December 31, 2023
 (in thousands) 
Amortized CostUnrealized GainsUnrealized LossesFair Value
Available for sale:    
U.S. Treasury and agencies$1,551,074 $6,192 $(78,874)$1,478,392 
Obligations of states and political subdivisions1,073,264 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.

March 31, 2024
Less than 12 Months12 Months or LongerTotal
  (in thousands) 
Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
Available for sale:      
U.S. Treasury and agencies$338,230 $(3,305)$816,265 $(82,674)$1,154,495 $(85,979)
Obligations of states and political subdivisions
297,204 (2,464)182,355 (22,685)479,559 (25,149)
Mortgage-backed securities and collateralized mortgage obligations
3,860,007 (51,572)1,756,986 (405,187)5,616,993 (456,759)
Total temporarily impaired securities$4,495,441 $(57,341)$2,755,606 $(510,546)$7,251,047 $(567,887)


December 31, 2023
Less than 12 Months12 Months or LongerTotal
  (in thousands)
Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized 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 March 31, 2024:  

Available For SaleHeld To Maturity
  (in thousands) 
Amortized CostFair ValueAmortized CostFair Value
Due within one year$141,688 $139,856 $— $— 
Due after one year through five years2,259,829 2,213,929 2 2 
Due after five years through ten years2,187,571 2,103,386 3 64 
Due after ten years4,583,038 4,159,374 2,242 2,873 
Total debt securities$9,172,126 $8,616,545 $2,247 $2,939 
Investment Securities Pledged To Secure Borrowings And Public Deposits
The following table presents, as of March 31, 2024, investment securities which were pledged to secure borrowings, public deposits, and repurchase agreements as permitted or required by law: 
 (in thousands)Amortized CostFair Value
To state and local governments to secure public deposits$1,800,912 $1,638,230 
To secure repurchase agreements326,111 297,673 
Other securities pledged 3,407,623 3,139,037 
Total pledged securities$5,534,646 $5,074,940