
(Dollars in thousands)
December 31, 2023	Amortized Cost	Unrealized Gains	Unrealized Losses	ACL	Fair Value
Available for Sale Debt Securities:
Obligations of U.S. government-sponsored enterprises	$250,450	$15	($24,723)	$—	$225,742
Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises	879,597	246	(125,887)	—	753,956

Individual name issuer trust preferred debt securities	9,400	—	(607)	—	8,793
Corporate bonds	13,182	—	(1,293)	—	11,889
Total available for sale debt securities	$1,152,629	$261	($152,510)	$—	$1,000,380


(Dollars in thousands)
December 31, 2022	Amortized Cost	Unrealized Gains	Unrealized Losses	ACL	Fair Value
Available for Sale Debt Securities:
Obligations of U.S. government-sponsored enterprises	$231,203	$1	($31,622)	$—	$199,582
Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises	912,581	269	(138,748)	—	774,102

Individual name issuer trust preferred debt securities	9,387	—	(627)	—	8,760
Corporate bonds	13,169	—	(1,685)	—	11,484
Total available for sale debt securities	$1,166,340	$270	($172,682)	$—	$993,928

At December 31, 2023 and 2022, securities with a fair value of $311.9 million and $294.8 million, respectively, were pledged as collateral for FHLB borrowings, potential borrowings with the FRBB, certain public deposits and for other purposes. See Note 13 for additional discussion of FHLB borrowings.

The schedule of maturities of available for sale debt securities is presented below. Mortgage-backed securities are included based on weighted average maturities, adjusted for anticipated prepayments. All other debt securities are included based on contractual maturities. Actual maturities may differ from amounts presented because certain issuers have the right to call or prepay obligations with or without call or prepayment penalties.


(Dollars in thousands)
December 31, 2023	Amortized Cost	Fair Value
Due in one year or less	$86,534	$74,195
Due after one year to five years	475,831	416,771
Due after five years to ten years	308,465	267,513
Due after ten years	281,799	241,901
Total securities	$1,152,629	$1,000,380

Included in the above table are debt securities with an amortized cost balance of $253.0 million and a fair value of $226.5 million at December 31, 2023 that are callable at the discretion of the issuers. Final maturities of the callable securities range from 6 months to 13 years, with call features ranging from 1 month to 7 months.

Management assesses the decline in fair value of investment securities on a regular basis. Unrealized losses on debt securities may occur from current market conditions, increases in interest rates since the time of purchase, a structural change in an investment, volatility of earnings of a specific issuer, or deterioration in credit quality of the issuer. Management evaluates both qualitative and quantitative factors to assess whether an impairment exists.

The following tables summarize available for sale debt securities in an unrealized loss position, for which an ACL on securities has not been recorded, segregated by length of time that the securities have been in a continuous unrealized loss position:


(Dollars in thousands)	Less than 12 Months			12 Months or Longer			Total
December 31, 2023	#	Fair Value	Unrealized Losses	#	Fair Value	Unrealized Losses	#	Fair Value	Unrealized Losses
Obligations of U.S. government-sponsored enterprises	1	$19,824	($176)	20	$195,903	($24,547)	21	$215,727	($24,723)
Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises	8	43,887	(262)	154	698,115	(125,625)	162	742,002	(125,887)
Individual name issuer trust preferred debt securities	—	—	—	3	8,793	(607)	3	8,793	(607)
Corporate bonds	—	—	—	4	11,889	(1,293)	4	11,889	(1,293)
Total temporarily impaired securities	9	$63,711	($438)	181	$914,700	($152,072)	190	$978,411	($152,510)


(Dollars in thousands)	Less than 12 Months			12 Months or Longer			Total
December 31, 2022	#	Fair Value	Unrealized Losses	#	Fair Value	Unrealized Losses	#	Fair Value	Unrealized Losses
Obligations of U.S. government-sponsored enterprises	4	$20,115	($638)	18	$169,466	($30,984)	22	$189,581	($31,622)
Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises	95	288,777	(24,960)	66	471,355	(113,788)	161	760,132	(138,748)
Individual name issuer trust preferred debt securities	—	—	—	3	8,760	(627)	3	8,760	(627)
Corporate bonds	—	—	—	4	11,484	(1,685)	4	11,484	(1,685)
Total temporarily impaired securities	99	$308,892	($25,598)	91	$661,065	($147,084)	190	$969,957	($172,682)

As of December 31, 2023, the Corporation does not intend to sell the debt securities in an unrealized loss position and has determined that it is more-likely-than-not that the Corporation will not be required to sell each security before the recovery of its amortized cost basis. In addition, management does not believe that any of the securities are impaired due to reasons of credit quality. As further described below, management believes the unrealized losses on these debt securities are primarily attributable to changes in the investment spreads and interest rates. Therefore, no ACL was recorded at both December 31, 2023 and 2022.

The contractual cash flows for these securities are either explicitly or implicitly guaranteed by the U.S. government, are highly rated by major credit rating agencies and have a long history of no credit losses. The issuers of these securities continue to make timely principal and interest payments and none of these securities were past due at December 31, 2023. As disclosed in Note 1, the Corporation utilizes a zero credit loss estimate for these securities.

These securities in an unrealized loss position at December 31, 2023 included three trust preferred securities issued by three individual companies in the banking sector. Management reviewed the collectability of these securities taking into consideration such factors as the financial condition of the issuers, reported regulatory capital ratios of the issuers, credit ratings, including ratings in effect as of the reporting period date, as well as credit rating changes between the reporting period date and the filing date of this report, and other information. As of December 31, 2023, there was one individual name issuer trust preferred debt security with an amortized cost of $2.0 million and unrealized losses of $228 thousand that was rated below investment grade by S&P. We noted no downgrades to below investment grade between December 31, 2023 and

the filing date of this report. Based on the information available through the filing date of this report, all individual name issuer trust preferred debt securities continue to accrue interest and make payments as expected with no payment deferrals or defaults on the part of the issuers.

These securities in an unrealized loss position at December 31, 2023 included four corporate bond holdings issued by three individual companies in the financial services industry. Management reviewed the collectability of these securities taking into consideration such factors as the financial condition of the issuers, reported regulatory capital ratios of the issuers, credit ratings, including ratings in effect as of the reporting period date, as well as credit rating changes between the reporting period date and the filing date of this report, and other information. As of December 31, 2023, there was one corporate bond debt security with an amortized cost of $2.0 million and unrealized losses of $102 thousand that was rated below investment grade by S&P. We noted no downgrades to below investment grade between December 31, 2023 and the filing date of this report. Based on the information available through the filing date of this report, all corporate bond debt securities continue to accrue interest and make payments as expected with no payment deferrals or defaults on the part of the issuers.