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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 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 costs, unrealized gains, unrealized losses and approximate fair values of debt securities at September 30, 2019 and December 31, 2018: 
 (in thousands)September 30, 2019
Amortized CostUnrealized GainsUnrealized LossesFair Value
AVAILABLE FOR SALE:            
U.S. Treasury and agencies$576,089  $11,379  $(268) $587,200  
Obligations of states and political subdivisions258,853  10,212  (35) 269,030  
Residential mortgage-backed securities and collateralized mortgage obligations
1,968,346  22,424  (4,924) 1,985,846  
 $2,803,288  $44,015  $(5,227) $2,842,076  
HELD TO MATURITY:    
Residential mortgage-backed securities and collateralized mortgage obligations
$3,320  $1,018  $—  $4,338  
 $3,320  $1,018  $—  $4,338  

 (in thousands)
December 31, 2018
Amortized CostUnrealized GainsUnrealized LossesFair Value
AVAILABLE FOR SALE:    
U.S. Treasury and agencies$40,002  $—  $(346) $39,656  
Obligations of states and political subdivisions308,972  2,785  (2,586) 309,171  
Residential mortgage-backed securities and collateralized mortgage obligations
2,696,913  3,590  (72,222) 2,628,281  
 $3,045,887  $6,375  $(75,154) $2,977,108  
HELD TO MATURITY:    
Residential mortgage-backed securities and collateralized mortgage obligations
$3,606  $1,038  $—  $4,644  
 $3,606  $1,038  $—  $4,644  
Schedule Of Fair Value And Unrealized Losses Of Securities
Debt securities that were in an unrealized loss position as of September 30, 2019 and December 31, 2018 are presented in the following tables, based on the length of time individual securities have been in an unrealized loss position.
 (in thousands)
September 30, 2019
Less than 12 Months12 Months or LongerTotal
 Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
AVAILABLE FOR SALE:      
U.S. Treasury and agencies$47,566  $226  $19,956  $42  $67,522  $268  
Obligations of states and political subdivisions
5,764  21  1,911  14  7,675  35  
Residential mortgage-backed securities and collateralized mortgage obligations
104,014  160  522,391  4,764  626,405  4,924  
Total temporarily impaired securities$157,344  $407  $544,258  $4,820  $701,602  $5,227  
 (in thousands)
December 31, 2018
Less than 12 Months12 Months or LongerTotal
 Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
AVAILABLE FOR SALE:      
U.S. Treasury and agencies$—  $—  $39,656  $346  $39,656  $346  
Obligations of states and political subdivisions
59,963  800  38,691  1,786  98,654  2,586  
Residential mortgage-backed securities and collateralized mortgage obligations
332,103  5,432  1,992,546  66,790  2,324,649  72,222  
Total temporarily impaired securities$392,066  $6,232  $2,070,893  $68,922  $2,462,959  $75,154  
Schedule Of Maturities Of Investment Securities
The following table presents the contractual maturities of debt securities at September 30, 2019:  
 (in thousands)
Available For SaleHeld To Maturity
 Amortized CostFair ValueAmortized CostFair Value
Due within one year$24,236  $24,228  $—  $—  
Due after one year through five years52,813  53,341  —  —  
Due after five years through ten years796,964  811,297  16  16  
Due after ten years1,929,275  1,953,210  3,304  4,322  
 $2,803,288  $2,842,076  $3,320  $4,338  
Debt Securities, Available-for-sale
The following table presents the gross realized gains and losses on the sale of debt securities available for sale for the nine months ended September 30, 2019 and 2018. There were no realized gains or losses on the sale of debt securities available for sale for the three months ended September 30, 2019 and 2018.
 (in thousands)
Nine Months Ended
September 30, 2019September 30, 2018
Gain  Loss  Gain  Loss  
Obligations of states and political subdivisions$16  $—  $—  $—  
Residential mortgage-backed securities and collateralized mortgage obligations143  (7,345) 14  —  
$159  $(7,345) $14  $—  

The following table presents the gains and losses on equity securities for the three and nine months ended September 30, 2019 and 2018:

 (in thousands)
Three Months EndedNine Months Ended
September 30, 2019September 30, 2018September 30, 2019September 30, 2018
Unrealized gain (loss) recognized on equity securities held at the end of the period$295  $(462) $1,744  $(1,894) 
Net gain (loss) recognized on equity securities sold during the period(38) —  81,815  —  
Total gain (loss) recognized on equity securities$257  $(462) $83,559  $(1,894) 
Investment Securities Pledged To Secure Borrowings And Public Deposits
The following table presents, as of September 30, 2019, 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$922,449  $934,186  
Other securities pledged principally to secure repurchase agreements490,393  498,739  
Total pledged securities$1,412,842  $1,432,925