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SECURITIES AVAILABLE FOR SALE, HELD TO MATURITY, AND EQUITY SECURITIES
9 Months Ended
Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
SECURITIES AVAILABLE FOR SALE, HELD TO MATURITY, AND EQUITY SECURITIES SECURITIES AVAILABLE FOR SALE, HELD TO MATURITY, AND
        EQUITY SECURITIES

The following is a summary of securities available for sale, held to maturity, and marketable equity securities:
(In thousands)Amortized  CostGross
Unrealized
Gains
Gross
Unrealized
Losses
Fair ValueAllowance
September 30, 2024    
Securities available for sale    
U.S. Treasuries
$6,896 $11 $— $6,907 
Municipal bonds and obligations
64,050 289 (1,408)62,931 — 
Agency collateralized mortgage obligations 308,857 340 (56,765)252,432 — 
Agency mortgage-backed securities
276,077 (43,155)232,931 — 
Agency commercial mortgage-backed securities
86,714 — (16,148)70,566 — 
Corporate bonds
38,697 23 (3,403)35,317 — 
Other bonds and obligations
655 67 (66)656 — 
Total securities available for sale781,946 739 (120,945)661,740 — 
Securities held to maturity    
Municipal bonds and obligations
236,707 421 (17,087)220,041 45 
Agency collateralized mortgage obligations 103,272 — (15,332)87,940 — 
Agency mortgage-backed securities
44,465 — (7,048)37,417 — 
Agency commercial mortgage-backed securities
126,312 — (22,001)104,311 — 
Tax advantaged economic development bonds
1,244 — (36)1,208 20 
Other bonds and obligations
277 — — 277 — 
Total securities held to maturity512,277 421 (61,504)451,194 65 
Equity securities15,035 — (1,757)13,278 — 
Total$1,309,258 $1,160 $(184,206)$1,126,212 $65 
(In thousands)Amortized  CostGross
Unrealized
Gains
Gross
Unrealized
Losses
Fair ValueAllowance
December 31, 2023    
Securities available for sale    
U.S. Treasuries
$7,980 $$— $7,981 $— 
Municipal bonds and obligations
64,788 494 (1,429)63,853 — 
Agency collateralized mortgage obligations 426,986 — (79,112)347,874 — 
Agency mortgage-backed securities
492,633 (75,155)417,480 — 
Agency commercial mortgage-backed securities
174,879 — (29,553)145,326 — 
Corporate bonds
43,291 34 (4,210)39,115 — 
Other bonds and obligations
655 67 (66)656 — 
Total securities available for sale1,211,212 598 (189,525)1,022,285 — 
Securities held to maturity    
Municipal bonds and obligations
251,046 698 (16,987)234,757 48 
Agency collateralized mortgage obligations 112,929 — (18,360)94,569 — 
Agency mortgage-backed securities
47,379 — (8,052)39,327 — 
Agency commercial mortgage-backed securities
130,169 — (24,368)105,801 — 
Tax advantaged economic development bonds
1,540 (60)1,486 20 
Other bonds and obligations
288 — — 288 — 
Total securities held to maturity543,351 704 (67,827)476,228 68 
Equity securities15,035 — (2,006)13,029 — 
Total$1,769,598 $1,302 $(259,358)$1,511,542 $68 
The following table summarizes the activity in the allowance for credit losses for debt securities held to maturity by security type for the three and nine months ended September 30, 2024 and 2023:
(In thousands)Municipal bonds and obligationsTax advantaged economic development bondsTotal
Balance at June 30, 2024$45 $20 $65 
Provision for credit losses— — — 
Balance at September 30, 2024$45 $20 $65 
(In thousands)Municipal bonds and obligationsTax advantaged economic development bondsTotal
Balance at June 30, 2023$49 $22 $71 
(Benefit) for credit losses(1)(1)(2)
Balance at September 30, 2023$48 $21 $69 
(In thousands)Municipal bonds and obligationsTax advantaged economic development bondsTotal
Balance at December 31, 2023$48 $20 $68 
(Benefit) for credit losses(3)— (3)
Balance at September 30, 2024$45 $20 $65 
(In thousands)Municipal bonds and obligationsTax advantaged economic development bondsTotal
Balance at December 31, 2022$66 $25 $91 
(Benefit) for credit losses(18)(4)(22)
Balance at September 30, 2023$48 $21 $69 

Credit Quality Information
The Company monitors the credit quality of held to maturity securities through credit ratings from various rating agencies. Credit ratings express opinions about the credit quality of a security and are utilized by the Company to make informed decisions. Investment grade securities are rated BBB-/Baa3 or higher and generally considered by the rating agencies and market participants to be of low credit risk. Conversely, securities rated below investment grade are considered to have distinctively higher credit risk than investment grade securities. For securities without credit ratings, the Company utilizes other financial information indicating the financial health of the underlying municipality, agency, or organization.

As of September 30, 2024, none of the Company's investment securities were delinquent or in non-accrual status.

The amortized cost and estimated fair value of available for sale (“AFS”) and held to maturity (“HTM”) securities segregated by contractual maturity at September 30, 2024 are presented below. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations. Mortgage-backed securities are shown in total, as their maturities are highly variable.
 Available for saleHeld to maturity
 AmortizedFairAmortizedFair
(In thousands)CostValueCostValue
Within 1 year$7,271 $7,281 $646 $646 
Over 1 year to 5 years19,220 18,903 1,910 1,904 
Over 5 years to 10 years48,936 45,939 48,372 48,226 
Over 10 years34,871 33,688 187,300 170,750 
Total bonds and obligations110,298 105,811 238,228 221,526 
Mortgage-backed securities671,648 555,929 274,049 229,668 
Total$781,946 $661,740 $512,277 $451,194 

During the three and nine months ended September 30, 2024, purchases of AFS securities totaled $46.4 million and $54.2 million, respectively. During the three months ended September 30, 2024, there were no sales of AFS securities. During the nine months ended September 30, 2024, proceeds from sales of AFS securities totaled $361.9 million. During the three and nine months ended September 30, 2023, purchases of AFS securities totaled $7.8 million and $44.6 million, respectively. During the three and nine months ended September 30, 2023, there were no sales of AFS securities. During the three months ended September 30, 2024, there were no gross gains or losses. During the nine months ended September 30, 2024, gross gains totaled $5.1 million and gross losses totaled $54.9 million. During the three and nine months ended September 30, 2023 there were no gross gains or losses.
Securities available for sale and held to maturity with unrealized losses, segregated by the duration of their continuous unrealized loss positions, are summarized as follows:
 Less Than Twelve MonthsOver Twelve MonthsTotal
 Gross Gross Gross 
 UnrealizedFairUnrealizedFairUnrealizedFair
(In thousands)LossesValueLossesValueLossesValue
September 30, 2024      
Securities available for sale      
U.S. Treasuries
$— $— $— $— $— $— 
Municipal bonds and obligations
61 10,885 1,347 26,465 1,408 37,350 
Agency collateralized mortgage obligations
— — 56,765 212,953 56,765 212,953 
Agency mortgage-backed securities
— — 43,155 232,132 43,155 232,132 
Agency commercial mortgage-backed securities— — 16,148 70,566 16,148 70,566 
Corporate bonds
— — 3,403 34,501 3,403 34,501 
Other bonds and obligations
— — 66 295 66 295 
Total securities available for sale$61 $10,885 $120,884 $576,912 $120,945 $587,797 
Securities held to maturity      
Municipal bonds and obligations$107 $34,770 $16,980 $115,023 $17,087 $149,793 
Agency collateralized mortgage obligations— — 15,332 87,940 15,332 87,940 
Agency mortgage-backed securities— — 7,048 37,417 7,048 37,417 
Agency commercial mortgage-backed securities— — 22,001 104,311 22,001 104,311 
Tax advantaged economic development bonds
370 31 838 36 1,208 
Total securities held to maturity112 35,140 61,392 345,529 61,504 380,669 
Total$173 $46,025 $182,276 $922,441 $182,449 $968,466 
December 31, 2023      
Securities available for sale      
Municipal bonds and obligations
$76 $9,326 $1,353 $22,739 $1,429 $32,065 
Agency collateralized mortgage obligations
— — 79,112 347,874 79,112 347,874 
Agency mortgage-backed securities
22 75,154 417,151 75,155 417,173 
Agency commercial mortgage-backed securities— — 29,553 145,326 29,553 145,326 
Corporate bonds
457 6,543 3,753 31,690 4,210 38,233 
Other bonds and obligations
— — 66 295 66 295 
Total securities available for sale$534 $15,891 $188,991 $965,075 $189,525 $980,966 
Securities held to maturity      
Municipal bonds and obligations
$229 $28,895 $16,758 $92,063 $16,987 $120,958 
Agency collateralized mortgage obligations
21 18,359 94,548 18,360 94,569 
Agency mortgage-backed securities
— — 8,052 39,327 8,052 39,327 
Agency commercial mortgage-backed securities
— — 24,368 105,801 24,368 105,801 
Tax advantaged economic development bonds
— — 60 922 60 922 
Total securities held to maturity230 28,916 67,597 332,661 67,827 361,577 
Total$764 $44,807 $256,588 $1,297,736 $257,352 $1,342,543 
Debt Securities
The Company expects to recover its amortized cost basis on all debt securities in its AFS and HTM portfolios. Furthermore, the Company does not intend to sell nor does it anticipate that it will be required to sell any of its securities in an unrealized loss position as of September 30, 2024, prior to this recovery. The Company’s ability and intent to hold these securities until recovery is supported by the Company’s strong capital and liquidity positions as well as its historically low portfolio turnover.

The following summarizes, by investment security type, the basis for the conclusion that the debt securities in an unrealized loss position within the Company’s AFS and HTM portfolios were not other-than-temporarily impaired at September 30, 2024:

AFS municipal bonds and obligations
At September 30, 2024, 40 of the 91 securities in the Company’s portfolio of AFS municipal bonds and obligations were in unrealized loss positions. Aggregate unrealized losses represented 3.6% of the amortized cost of securities in unrealized loss positions. The Company continually monitors the municipal bond sector of the market carefully and periodically evaluates the appropriate level of exposure to the market. At this time, the Company has determined that the bonds in this portfolio carry minimal risk of default and the Company is appropriately compensated for that risk. There were no material underlying credit downgrades during the quarter. All securities are performing.

AFS collateralized mortgage obligations
At September 30, 2024, 37 of the 40 securities in the Company’s portfolio of AFS collateralized mortgage obligations were in unrealized loss positions. Aggregate unrealized losses represented 21.1% of the amortized cost of securities in unrealized loss positions. The Federal National Mortgage Association (“FNMA”), Federal Home Loan Mortgage Corporation (“FHLMC”), and Government National Mortgage Association (“GNMA”) guarantee the contractual cash flows of all of the Company’s collateralized mortgage obligations. The securities are investment grade rated and there were no material underlying credit downgrades during the quarter. All securities are performing.

AFS commercial and residential mortgage-backed securities
At September 30, 2024, 28 of the 28 securities in the Company’s portfolio of AFS mortgage-backed securities were in unrealized loss positions. Aggregate unrealized losses represented 16.4% of the amortized cost of securities in unrealized loss positions. The FNMA, FHLMC, and GNMA guarantee the contractual cash flows of all of the Company’s mortgage-backed securities. The securities are investment grade rated and there were no material underlying credit downgrades during the quarter. All securities are performing.

AFS corporate bonds
At September 30, 2024, 13 of the 14 securities in the Company’s portfolio of AFS corporate bonds were in unrealized loss positions. Aggregate unrealized losses represents 9.0% of the amortized cost of the bonds in unrealized loss positions. The Company reviews the financial strength of all of these bonds and has concluded that the amortized cost remains supported by the expected future cash flows of these securities. All securities are performing.

AFS other bonds and obligations
At September 30, 2024, 2 of the 3 securities in the Company’s portfolio of AFS other bonds and obligations were in unrealized loss positions. Aggregate unrealized losses represents 18.3% of the amortized cost of the bonds in unrealized loss positions. The Company reviews the financial strength of all of these bonds and has concluded that the amortized cost remains supported by the expected future cash flows of these securities. All securities are performing.
HTM municipal bonds and obligations
At September 30, 2024, 111 of the 161 securities in the Company’s portfolio of HTM municipal bonds and obligations were in unrealized loss positions. Aggregate unrealized losses represented 10.2% of the amortized cost of securities in unrealized loss positions. The Company continually monitors the municipal bond sector of the market carefully and periodically evaluates the appropriate level of exposure to the market. At this time, the Company has determined that the bonds in this portfolio carry minimal risk of default and the Company is appropriately compensated for that risk. There were no material underlying credit downgrades during the quarter. All securities are performing.

HTM collateralized mortgage obligations
At September 30, 2024, 12 of the 12 securities in the Company’s portfolio of HTM collateralized mortgage obligations were in unrealized loss positions. Aggregate unrealized losses represented 14.9% of the amortized cost of the securities in unrealized loss positions. The FNMA, FHLMC, and GNMA guarantee the contractual cash flows of all of the Company's collateralized residential mortgage obligations. The securities are investment grade rated, and there were no material underlying credit downgrades during the quarter. All securities are performing.

HTM commercial and residential mortgage-backed securities
At September 30, 2024, 17 of the 17 securities in the Company’s portfolio of HTM mortgage-backed securities were in unrealized loss positions. Aggregate unrealized losses represented 17.0% of the amortized cost of securities in unrealized loss positions. The FNMA, FHLMC, and GNMA guarantee the contractual cash flows of the Company’s mortgage-backed securities. The securities are investment grade rated and there were no material underlying credit downgrades during the quarter. All securities are performing.

HTM tax-advantaged economic development bonds
At September 30, 2024, 2 of the 2 securities in the Company’s portfolio of tax-advantaged economic development bonds were in unrealized loss positions. Aggregate unrealized losses represented 2.9% of the amortized cost of securities in unrealized loss positions. The Company believes that more likely than not all the principal outstanding will be collected. All securities are performing.