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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2019
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 at December 31, 2021 and 2020: 

December 31, 2021
(in thousands)Amortized CostUnrealized GainsUnrealized LossesFair Value
Available for sale:    
U.S. Treasury and agencies$894,969 $27,279 $(4,195)$918,053 
Obligations of states and political subdivisions320,338 11,734 (1,288)330,784 
Residential mortgage-backed securities and collateralized mortgage obligations2,649,048 19,093 (46,543)2,621,598 
Total available for sale securities$3,864,355 $58,106 $(52,026)$3,870,435 
Held to maturity:    
Residential mortgage-backed securities and collateralized mortgage obligations$2,744 $770 $— $3,514 
Total held to maturity securities$2,744 $770 $— $3,514 

December 31, 2020
(in thousands)Amortized CostUnrealized GainsUnrealized LossesFair Value
Available for sale:
U.S. Treasury and agencies$698,243 $64,271 $(312)$762,202 
Obligations of states and political subdivisions263,546 15,996 (31)279,511 
Residential mortgage-backed securities and collateralized mortgage obligations1,839,711 51,583 (449)1,890,845 
Total available for sale securities$2,801,500 $131,850 $(792)$2,932,558 
Held to maturity:    
Residential mortgage-backed securities and collateralized mortgage obligations$3,034 $849 $— $3,883 
Total held to maturity securities$3,034 $849 $— $3,883 
  
Schedule Of Fair Value And Unrealized Losses Of Securities
December 31, 2021
Less than 12 Months12 Months or LongerTotal
(in thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
Available for sale:      
U.S. Treasury and agencies$197,529 $2,749 $28,378 $1,446 $225,907 $4,195 
Obligations of states and political subdivisions75,200 1,153 2,162 135 77,362 1,288 
Residential mortgage-backed securities and collateralized mortgage obligations1,777,288 40,579 129,943 5,964 1,907,231 46,543 
Total temporarily impaired securities$2,050,017 $44,481 $160,483 $7,545 $2,210,500 $52,026 

December 31, 2020
Less than 12 Months12 Months or LongerTotal
(in thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
Available for sale:      
U.S. Treasury and agencies$29,493 $312 $— $— $29,493 $312 
Obligations of states and political subdivisions4,357 31 — — 4,357 31 
Residential mortgage-backed securities and collateralized mortgage obligations215,165 449 — — 215,165 449 
Total temporarily impaired securities$249,015 $792 $— $— $249,015 $792 
  
Schedule Of Maturities Of Investment Securities  
The following table presents the contractual maturities of debt securities at December 31, 2021:
Available For SaleHeld To Maturity
(in thousands)Amortized CostFair ValueAmortized CostFair Value
Due within one year$11,608 $11,749 $— $— 
Due after one year through five years250,556 256,279 2 2 
Due after five years through ten years979,600 1,004,824 7 7 
Due after ten years2,622,591 2,597,583 2,735 3,505 
Total securities$3,864,355 $3,870,435 $2,744 $3,514 
Investment Securities Pledged To Secure Borrowings And Public Deposits
The following table presents, as of December 31, 2021, 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$271,285 $276,094 
To secure repurchase agreements610,093 625,543 
Other securities pledged 244,520 245,794 
Total pledged securities$1,125,898 $1,147,431