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Securities
 9 Months Ended
Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Securities Securities
(In Thousands, Except Number of Securities)

The amortized cost and fair value of securities available for sale were as follows as of the dates presented in the tables below.

There was no allowance for credit losses allocated to any of the Company’s available for sale securities as of September 30, 2024 or December 31, 2023.
 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
September 30, 2024
Obligations of states and political subdivisions$20,310 $130 $(1,878)$18,562 
Residential mortgage backed securities:
Government agency mortgage backed securities191,650 374 (19,177)172,847 
Government agency collateralized mortgage obligations408,364 — (71,481)336,883 
Commercial mortgage backed securities:
Government agency mortgage backed securities6,010 — (466)5,544 
Government agency collateralized mortgage obligations137,474 192 (19,224)118,442 
Other debt securities114,637 605 (2,676)112,566 
$878,445 $1,301 $(114,902)$764,844 
 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
December 31, 2023
Obligations of states and political subdivisions$36,374 $119 $(1,883)$34,610 
Residential mortgage backed securities:
Government agency mortgage backed securities301,400 172 (24,968)276,604 
Government agency collateralized mortgage obligations485,164 — (85,883)399,281 
Commercial mortgage backed securities:
Government agency mortgage backed securities6,029 — (637)5,392 
Government agency collateralized mortgage obligations161,299 24 (21,965)139,358 
Other debt securities72,383 109 (4,458)68,034 
$1,062,649 $424 $(139,794)$923,279 
The amortized cost and fair value of securities held to maturity were as follows as of the dates presented:
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
September 30, 2024
Obligations of states and political subdivisions$285,450 $38 $(34,861)$250,627 
Residential mortgage backed securities
Government agency mortgage backed securities386,654 14 (11,742)374,926 
Government agency collateralized mortgage obligations363,095 — (23,736)339,359 
Commercial mortgage backed securities:
Government agency mortgage backed securities16,966 — (2,404)14,562 
Government agency collateralized mortgage obligations43,966 — (6,326)37,640 
Other debt securities54,432 — (2,578)51,854 
$1,150,563 $52 $(81,647)$1,068,968 
Allowance for credit losses - held to maturity securities(32)
Held to maturity securities, net of allowance for credit losses$1,150,531 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
December 31, 2023
Obligations of states and political subdivisions$288,154 $74 $(33,688)$254,540 
Residential mortgage backed securities
Government agency mortgage backed securities426,264 — (20,314)405,950 
Government agency collateralized mortgage obligations387,208 — (31,670)355,538 
Commercial mortgage backed securities:
Government agency mortgage backed securities16,983 — (2,972)14,011 
Government agency collateralized mortgage obligations44,514 — (6,977)37,537 
Other debt securities58,373 — (4,119)54,254 
$1,221,496 $74 $(99,740)$1,121,830 
Allowance for credit losses - held to maturity securities(32)
Held to maturity securities, net of allowance for credit losses$1,221,464 

Securities sold during the nine months ended September 30, 2024 and 2023 are presented in the tables below. With respect to the securities sold during the first nine months ended September 30, 2024, the Company intended to sell these securities as of December 31, 2023, and completed the sale in January 2024. Therefore, the Company impaired the securities and recognized the loss in net income as of December 31, 2023. There were no securities sold during the third quarters of 2024 or 2023.
Carrying Value Immediately Prior to SaleNet ProceedsImpairment (Recognized in December 2023)
Nine months ended September 30, 2024
Obligations of states and political subdivisions$12,301 $11,360 $(941)
Residential mortgage backed securities:
Government agency mortgage backed securities107,389 95,922 (11,467)
Government agency collateralized mortgage obligations48,300 43,990 (4,310)
Commercial mortgage backed securities:
Government agency collateralized mortgage obligations28,547 25,913 (2,634)
$196,537 $177,185 $(19,352)
Carrying Value Immediately Prior to SaleNet ProceedsImpairment
Nine months ended September 30, 2023
Obligations of other U.S. Government agencies and corporations$170,000 $164,915 $(5,085)
Obligations of states and political subdivisions104,950 99,439 (5,511)
Residential mortgage backed securities:
Government agency mortgage backed securities137,196 130,602 (6,594)
Government agency collateralized mortgage obligations54,028 51,101 (2,927)
Commercial mortgage backed securities:
Government agency mortgage backed securities5,048 4,825 (223)
Government agency collateralized mortgage obligations40,197 38,099 (2,098)
$511,419 $488,981 $(22,438)
At September 30, 2024 and December 31, 2023, securities with a carrying value of $796,621 and $880,715, respectively, were pledged to secure government, public and trust deposits. Securities with a carrying value of $27,542 and $14,329 were pledged as collateral for short-term borrowings and derivative instruments at September 30, 2024 and December 31, 2023, respectively.
The amortized cost and fair value of securities at September 30, 2024 by contractual maturity are shown below. Expected maturities will differ from contractual maturities because issuers may call or prepay obligations with or without call or prepayment penalties.
 
 Held to MaturityAvailable for Sale
 Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due within one year$1,308 $1,293 $998 $1,046 
Due after one year through five years6,268 5,963 42,107 42,171 
Due after five years through ten years139,202 125,714 35,012 32,414 
Due after ten years193,104 169,511 50,312 49,462 
Residential mortgage backed securities:
Government agency mortgage backed securities386,654 374,926 191,650 172,847 
Government agency collateralized mortgage obligations363,095 339,359 408,364 336,883 
Commercial mortgage backed securities:
Government agency mortgage backed securities16,966 14,562 6,010 5,544 
Government agency collateralized mortgage obligations43,966 37,640 137,474 118,442 
Other debt securities— — 6,518 6,035 
$1,150,563 $1,068,968 $878,445 $764,844 
The following tables present the age of gross unrealized losses and fair value by investment category for which an allowance for credit losses has not been recorded as of the dates presented:
 
 Less than 12 Months12 Months or MoreTotal
 #Fair
Value		Unrealized
Losses		#Fair
Value		Unrealized
Losses		#Fair
Value		Unrealized
Losses
Available for Sale:
September 30, 2024
Obligations of states and political subdivisions— $— $— 7$13,278 $(1,878)7$13,278 $(1,878)
Residential mortgage backed securities:
Government agency mortgage backed securities2 3,914 (61)34152,229 (19,116)36156,143 (19,177)
Government agency collateralized mortgage obligations— — — 37336,883 (71,481)37336,883 (71,481)
Commercial mortgage backed securities:
Government agency mortgage backed securities—— — 25,543 (466)25,543 (466)
Government agency collateralized mortgage obligations—— — 25107,597 (19,224)25107,597 (19,224)
Other debt securities— — — 1834,337 (2,676)1834,337 (2,676)
Total2$3,914 $(61)123$649,867 $(114,841)125$653,781 $(114,902)
December 31, 2023
Obligations of states and political subdivisions3$2,914 $(2)9$15,198 $(1,881)12$18,112 $(1,883)
Residential mortgage backed securities:
Government agency mortgage backed securities1806 (25)35166,963 (24,943)36167,769 (24,968)
Government agency collateralized mortgage obligations— — — 37354,574 (85,883)37354,574 (85,883)
Commercial mortgage backed securities:
Government agency mortgage backed securities— — — 25,392 (637)25,392 (637)
Government agency collateralized mortgage obligations— — — 25108,575 (21,965)25108,575 (21,965)
Other debt securities23,099 (195)1935,072 (4,263)2138,171 (4,458)
Total6$6,819 $(222)127$685,774 $(139,572)133$692,593 $(139,794)
 Less than 12 Months12 Months or MoreTotal
 #Fair
Value		Unrealized
Losses		#Fair
Value		Unrealized
Losses		#Fair
Value		Unrealized
Losses
Held to Maturity:
September 30, 2024
Obligations of states and political subdivisions1$2,370 $(10)127$246,559 $(34,851)128$248,929 $(34,861)
Residential mortgage backed securities:
Government agency mortgage backed securities—— — 69357,350 (11,742)69357,350 (11,742)
Government agency collateralized mortgage obligations—— — 18339,359 (23,736)18339,359 (23,736)
Commercial mortgage backed securities:
Government agency mortgage backed securities—— — 114,562 (2,404)114,562 (2,404)
Government agency collateralized mortgage obligations—— — 937,640 (6,326)937,640 (6,326)
Other debt securities—— — 1051,854 (2,578)1051,854 (2,578)
Total1$2,370 $(10)234$1,047,324 $(81,637)235$1,049,694 $(81,647)
December 31, 2023
Obligations of states and political subdivisions2$2,807 $(25)126$249,995 $(33,663)128$252,802 $(33,688)
Residential mortgage backed securities:
Government agency mortgage backed securities—— — 70405,950 (20,314)70405,950 (20,314)
Government agency collateralized mortgage obligations—— — 18355,538 (31,670)18355,538 (31,670)
Commercial mortgage backed securities:
Government agency mortgage backed securities—— — 114,011 (2,972)114,011 (2,972)
Government agency collateralized mortgage obligations—— — 937,537 (6,977)937,537 (6,977)
Other debt securities—— — 1054,254 (4,119)1054,254 (4,119)
Total2$2,807 $(25)234$1,117,285 $(99,715)236$1,120,092 $(99,740)
 
The Company evaluates its available for sale investment securities in an unrealized loss position on a quarterly basis. If the Company intends to sell the security or it is more likely than not that it will be required to sell before recovery, the entire unrealized loss is recorded as a loss within noninterest income in the Consolidated Statements of Income along with a corresponding adjustment to the amortized cost basis of the security. If the Company does not intend to sell the security and it is not more likely than not that it will be required to sell the security before recovery of its amortized cost basis, the Company evaluates if any of the unrealized loss is related to a potential credit loss. The amount related to credit loss, if any, is recognized in earnings as a provision for credit loss and a corresponding allowance for credit losses is established; each is calculated as the difference between the estimate of the discounted future contractual cash flows and the amortized cost basis of the security. A number of qualitative and quantitative factors are considered by management in the estimate of the discounted future contractual cash flows, including the financial condition of the underlying issuer, current and projected deferrals or defaults and credit ratings by nationally recognized statistical rating agencies. The remaining difference between the fair value and the amortized cost basis of the security is considered the amount related to other market factors and is recognized in other comprehensive income, net of tax.

As of September 30, 2024, the Company does not intend to sell any of the securities in an unrealized loss position, and it is not more likely than not that the Company will be required to sell any such security prior to the recovery of its amortized cost basis, which may be maturity. Furthermore, more than 90% of available for sale securities have the explicit or implicit backing of the federal government. Performance of these securities has been in line with broader market price performance, indicating that increases in market-based, risk-free rates, and not credit-related factors, are driving losses. When determining the fair value of
the contractual cash flows for municipal and corporate securities, the Company considers historical experience with credit sensitive securities, current market conditions, the financial condition of the underlying issuer, current credit ratings, ratings changes and outlook, explicit and implicit guarantees, or insurance programs. Based upon its review of these factors as of September 30, 2024, the Company determined that all such losses resulted from factors not deemed credit-related. As a result, no credit-related impairment was recognized in current earnings, and all unrealized losses for available for sale securities were recorded in other comprehensive income (loss). See Note 12, “Other Comprehensive Income” for more information on the Company’s unrealized losses on securities.

The allowance for credit losses on held to maturity securities was $32 at September 30, 2024 and December 31, 2023. The Company monitors the credit quality of debt securities held to maturity using bond investment grades assigned by nationally recognized statistical ratings agencies. Updated investment grades are obtained as they become available from agencies. As of September 30, 2024, all of the amortized cost of debt securities held to maturity were rated A or higher by the ratings agencies.