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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2023
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 March 31, 2023 and December 31, 2022: 
March 31, 2023
 (in thousands) Amortized CostUnrealized GainsUnrealized LossesFair Value
Available for sale:    
U.S. Treasury and agencies$1,584,480 $3,940 $(86,058)$1,502,362 
Obligations of states and political subdivisions1,086,982 21,327 (22,124)1,086,185 
Mortgage-backed securities and collateralized mortgage obligations
6,974,815 68,832 (382,594)6,661,053 
Total available for sale securities$9,646,277 $94,099 $(490,776)$9,249,600 
Held to maturity:    
Mortgage-backed securities and collateralized mortgage obligations
$2,432 $743 $— $3,175 
Total held to maturity securities$2,432 $743 $— $3,175 


December 31, 2022
 (in thousands) 
Amortized CostUnrealized GainsUnrealized LossesFair Value
Available for sale:    
U.S. Treasury and agencies$1,035,532 $— $(99,358)$936,174 
Obligations of states and political subdivisions297,610 231 (28,041)269,800 
Mortgage-backed securities and collateralized mortgage obligations
2,405,139 3 (414,950)1,990,192 
Total available for sale securities$3,738,281 $234 $(542,349)$3,196,166 
Held to maturity:    
Mortgage-backed securities and collateralized mortgage obligations
$2,476 $721 $— $3,197 
Total held to maturity securities$2,476 $721 $— $3,197 
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value
Debt securities that were in an unrealized loss position as of March 31, 2023 and December 31, 2022 are presented in the following tables, based on the length of time individual securities have been in an unrealized loss position.

March 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$78,917 $3,513 $770,126 $82,545 $849,043 $86,058 
Obligations of states and political subdivisions
59,926 425 129,513 21,699 189,439 22,124 
Mortgage-backed securities and collateralized mortgage obligations
174,883 3,083 1,912,276 379,511 2,087,159 382,594 
Total temporarily impaired securities$313,726 $7,021 $2,811,915 $483,755 $3,125,641 $490,776 


December 31, 2022
Less than 12 Months12 Months or LongerTotal
  (in thousands)
Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
Available for sale:      
U.S. Treasury and agencies$734,473 $71,967 $201,701 $27,391 $936,174 $99,358 
Obligations of states and political subdivisions
160,078 10,037 60,381 18,004 220,459 28,041 
Mortgage-backed securities and collateralized mortgage obligations
592,032 61,813 1,398,061 353,137 1,990,093 414,950 
Total temporarily impaired securities$1,486,583 $143,817 $1,660,143 $398,532 $3,146,726 $542,349 
Schedule Of Maturities Of Investment Securities
The following table presents the contractual maturities of debt securities at March 31, 2023:  

Available For SaleHeld To Maturity
  (in thousands) 
Amortized CostFair ValueAmortized CostFair Value
Due within one year$46,775 $46,157 $— $— 
Due after one year through five years1,654,173 1,646,542 4 4 
Due after five years through ten years2,924,904 2,870,751 2 2 
Due after ten years5,020,425 4,686,150 2,426 3,169 
Total securities$9,646,277 $9,249,600 $2,432 $3,175 
Investment Securities Pledged To Secure Borrowings And Public Deposits
The following table presents, as of March 31, 2023, 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$1,659,206 $1,529,789 
To secure repurchase agreements635,851 577,667 
Other securities pledged 2,564,019 2,375,610 
Total pledged securities$4,859,076 $4,483,066