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Investment Securities
 9 Months Ended
Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Investment Securities Investment Securities 
 
The following tables present the amortized cost, unrealized gains, unrealized losses and approximate fair values of debt securities as of September 30, 2022 and December 31, 2021: 
September 30, 2022
 (in thousands) Amortized CostUnrealized GainsUnrealized LossesFair Value
Available for sale:    
U.S. Treasury and agencies$935,469 $— $(104,656)$830,813 
Obligations of states and political subdivisions304,585 80 (34,761)269,904 
Mortgage-backed securities and collateralized mortgage obligations
2,466,040 1 (430,367)2,035,674 
Total available for sale securities$3,706,094 $81 $(569,784)$3,136,391 
Held to maturity:    
Mortgage-backed securities and collateralized mortgage obligations
$2,547 $740 $— $3,287 
Total held to maturity securities$2,547 $740 $— $3,287 

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 
Mortgage-backed securities and collateralized mortgage obligations
2,649,048 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:    
Mortgage-backed securities and collateralized mortgage obligations
$2,744 $770 $— $3,514 
Total held to maturity securities$2,744 $770 $— $3,514 

The Company elected to exclude accrued interest receivable from the amortized cost basis of debt securities disclosed throughout this note. Interest accrued on investment securities totaled $12.3 million and $10.4 million as of September 30, 2022 and December 31, 2021, respectively, and is included in Other Assets.

Debt securities that were in an unrealized loss position as of September 30, 2022 and December 31, 2021 are presented in the following tables, based on the length of time individual securities have been in an unrealized loss position.

September 30, 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$714,139 $81,728 $116,674 $22,928 $830,813 $104,656 
Obligations of states and political subdivisions
224,486 24,966 31,605 9,795 256,091 34,761 
Mortgage-backed securities and collateralized mortgage obligations
970,093 142,645 1,065,483 287,722 2,035,576 430,367 
Total temporarily impaired securities$1,908,718 $249,339 $1,213,762 $320,445 $3,122,480 $569,784 


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 subdivisions
75,200 1,153 2,162 135 77,362 1,288 
Mortgage-backed securities and collateralized mortgage obligations
1,777,288 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 

These unrealized losses on the debt securities held by the Company were caused by changes in market interest rates or the widening of market spreads subsequent to the initial purchase of these securities and are not due to the underlying credit of the issuers. Management monitors the published credit ratings of the issuers of the debt securities for material rating or outlook changes. Substantially all of the Company's obligations of states and political subdivisions are general obligation issuances. All of the available for sale mortgage-backed securities and collateralized mortgage obligations portfolio in an unrealized loss position at September 30, 2022 are issued or guaranteed by government sponsored enterprises. Because the decline in fair value of the debt securities is attributable to changes in interest rates or widening market spreads and not credit quality, these investments do not have an allowance for credit losses at September 30, 2022.
The following table presents the contractual maturities of debt securities at September 30, 2022:  

Available For SaleHeld To Maturity
  (in thousands) 
Amortized CostFair ValueAmortized CostFair Value
Due within one year$32,935 $31,768 $— $— 
Due after one year through five years381,941 355,163 4 4 
Due after five years through ten years879,699 769,002 3 3 
Due after ten years2,411,519 1,980,458 2,540 3,280 
Total securities$3,706,094 $3,136,391 $2,547 $3,287 

The following table presents, as of September 30, 2022, 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$492,344 $433,917 
To secure repurchase agreements479,063 416,031 
Other securities pledged 243,069 217,513 
Total pledged securities$1,214,476 $1,067,461