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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2020
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 June 30, 2020 and December 31, 2019: 
June 30, 2020
 (in thousands) Amortized CostUnrealized GainsUnrealized LossesFair Value
Available for sale:    
U.S. Treasury and agencies$690,207  $64,097  $—  $754,304  
Obligations of states and political subdivisions250,015  14,712  (66) 264,661  
Residential mortgage-backed securities and collateralized mortgage obligations
1,788,893  57,950  (118) 1,846,725  
Total available for sale securities$2,729,115  $136,759  $(184) $2,865,690  
Held to maturity:    
Residential mortgage-backed securities and collateralized mortgage obligations
$3,143  $826  $—  $3,969  
Total held to maturity securities$3,143  $826  $—  $3,969  


December 31, 2019
 (in thousands) 
Amortized CostUnrealized GainsUnrealized LossesFair Value
Available for sale:    
U.S. Treasury and agencies$642,009  $5,919  $(4,324) $643,604  
Obligations of states and political subdivisions251,531  9,600  (37) 261,094  
Residential mortgage-backed securities and collateralized mortgage obligations
1,896,708  18,962  (5,686) 1,909,984  
Total available for sale securities$2,790,248  $34,481  $(10,047) $2,814,682  
Held to maturity:    
Residential mortgage-backed securities and collateralized mortgage obligations
$3,260  $1,003  $—  $4,263  
Total held to maturity securities$3,260  $1,003  $—  $4,263  
Schedule Of Fair Value And Unrealized Losses Of Securities
Debt securities that were in an unrealized loss position as of June 30, 2020 and December 31, 2019 are presented in the following tables, based on the length of time individual securities have been in an unrealized loss position.

June 30, 2020
Less than 12 Months12 Months or LongerTotal
  (in thousands) 
Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
Available for sale:      
Obligations of states and political subdivisions
$16,729  $66  $—  $—  $16,729  $66  
Residential mortgage-backed securities and collateralized mortgage obligations
124,090  118  —  —  124,090  118  
Total $140,819  $184  $—  $—  $140,819  $184  

December 31, 2019
Less than 12 Months12 Months or LongerTotal
  (in thousands)
Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
Available for sale:      
U.S. Treasury and agencies$313,169  $4,324  $—  $—  $313,169  $4,324  
Obligations of states and political subdivisions
4,611  30  1,906  7  6,517  37  
Residential mortgage-backed securities and collateralized mortgage obligations
288,866  1,628  402,802  4,058  691,668  5,686  
Total$606,646  $5,982  $404,708  $4,065  $1,011,354  $10,047  
Schedule Of Maturities Of Investment Securities
The following table presents the contractual maturities of debt securities at June 30, 2020:  

Available For SaleHeld To Maturity
  (in thousands) 
Amortized CostFair ValueAmortized CostFair Value
Due within one year$21,769  $21,844  $—  $—  
Due after one year through five years74,546  76,542  3  3  
Due after five years through ten years864,633  932,715  11  11  
Due after ten years1,768,167  1,834,589  3,129  3,955  
Total securities$2,729,115  $2,865,690  $3,143  $3,969  
Investment Securities Pledged To Secure Borrowings And Public Deposits
The following table presents, as of June 30, 2020, 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$296,883  $307,204  
Other securities pledged principally to secure repurchase agreements630,343  669,759  
Total pledged securities$927,226  $976,963