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INVESTMENT SECURITIES (Tables)
9 Months Ended
Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Summary of available for sale and held to maturity investment securities
The amortized cost, gross unrecognized/unrealized gains and losses, fair value and related ACL on available-for-sale ("AFS") and held-to-maturity ("HTM") debt securities at September 30, 2024 and December 31, 2023 are as follows:

Amortized CostGross Unrealized GainsGross Unrealized LossesFair ValueACL
(dollars in thousands)
September 30, 2024
Available-for-sale:    
Debt securities:    
States and political subdivisions$147,833 $18 $(24,670)$123,181 $— 
Corporate securities35,373 — (2,819)32,554 — 
U.S. Treasury and other government-sponsored entities and agencies59,632 1,323 (1,725)59,230 — 
Mortgage-backed securities:    
Residential - U.S. government-sponsored entities and agencies433,493 857 (48,054)386,296 — 
Residential - Non-government agencies18,085 471 (722)17,834 — 
Commercial - U.S. government-sponsored entities and agencies101,018 425 (12,414)89,029 — 
Commercial - Non-government agencies15,331 (7)15,329 — 
Total available-for-sale investment securities$810,765 $3,099 $(90,411)$723,453 $— 

Amortized CostGross Unrecognized GainsGross Unrecognized LossesFair ValueACL
(dollars in thousands)
September 30, 2024
Held-to-maturity:
Debt securities:
States and political subdivisions$42,013 $— $(7,283)$34,730 $— 
Mortgage-backed securities:
Residential - U.S. government-sponsored entities and agencies564,104 63 (51,907)512,260 — 
Total held-to-maturity investment securities$606,117 $63 $(59,190)$546,990 $— 

Amortized CostGross Unrealized GainsGross Unrealized LossesFair ValueACL
(dollars in thousands)
December 31, 2023
Available-for-sale:    
Debt securities:    
States and political subdivisions$156,432 $13 $(29,810)$126,635 $— 
Corporate securities35,731 — (4,317)31,414 — 
U.S. Treasury and other government-sponsored entities and agencies28,105 33 (1,941)26,197 — 
Mortgage-backed securities: 
Residential - U.S. government-sponsored entities and agencies441,898 95 (63,607)378,386 — 
Residential - Non-government agencies19,322 366 (980)18,708 — 
Commercial - U.S. government-sponsored entities and agencies58,318 — (7,404)50,914 — 
Commercial - Non-government agencies15,144 — (188)14,956 — 
Total available-for-sale investment securities$754,950 $507 $(108,247)$647,210 $— 
Amortized CostGross Unrecognized GainsGross Unrecognized LossesFair ValueACL
(dollars in thousands)
December 31, 2023
Held-to-maturity:
Debt securities:
States and political subdivisions$41,959 $— $(6,706)$35,253 $— 
Mortgage-backed securities:
Residential - U.S. government-sponsored entities and agencies590,379 61 (60,515)529,925 — 
Total held-to-maturity investment securities$632,338 $61 $(67,221)$565,178 $— 
Schedule of amortized cost and estimated fair value of investment securities by contractual maturity
The amortized cost, estimated fair value and weighted average yield of our AFS and HTM debt securities at September 30, 2024, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. Securities not due at a single maturity date are shown separately.

(dollars in thousands)Amortized CostFair Value
Weighted Average Yield (1)
Available-for-sale:  
Debt securities:
Due in one year or less$4,287 $4,300 5.88 %
Due after one year through five years58,844 56,071 2.78 
Due after five years through ten years58,523 57,627 3.92 
Due after ten years121,184 96,967 2.43 
Mortgage-backed securities:
Residential - U.S. government-sponsored entities and agencies433,493 386,296 2.27 
Residential - Non-government agencies18,085 17,834 5.59 
Commercial - U.S. government-sponsored entities and agencies101,018 89,029 2.73 
Commercial - Non-government agencies15,331 15,329 4.55 
Total available-for-sale securities$810,765 $723,453 2.67 %
(dollars in thousands)Amortized CostFair Value
Weighted Average Yield (1)
Held-to-maturity:  
Debt securities:
Due after ten years$42,013 $34,730 2.26 %
Mortgage-backed securities:  
Residential - U.S. government-sponsored entities and agencies564,104 512,260 1.90 
Total held-to-maturity securities$606,117 $546,990 1.92 %

(1)Weighted-average yields are computed on an annual basis, and yields on tax-exempt obligations are computed on a taxable-equivalent basis using a federal statutory tax rate of 21%
Schedule of investment securities in an unrealized loss position
The following tables summarize AFS and HTM investment securities, which were in a loss position as of the dates presented, aggregated by major security type and length of time in a continuous loss position. There were a total of 212 and 208 AFS investment securities which were in an unrealized loss position, without an ACL, at September 30, 2024 and December 31, 2023, respectively. There were a total of 82 HTM investment securities which were in an unrecognized loss position, without an ACL, at September 30, 2024 and December 31, 2023.

Less Than 12 Months12 Months or LongerTotal
(dollars in thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
September 30, 2024
Available-for-sale:
Debt securities:      
States and political subdivisions$4,600 $(33)$111,552 $(24,637)$116,152 $(24,670)
Corporate securities— — 32,554 (2,819)32,554 (2,819)
U.S. Treasury and other government-sponsored entities and agencies1,308 (26)14,498 (1,699)15,806 (1,725)
Mortgage-backed securities:      
Residential - U.S. government-sponsored entities and agencies23,295 (183)329,454 (47,871)352,749 (48,054)
Residential - Non-government agencies— — 7,992 (722)7,992 (722)
Commercial - U.S. government-sponsored entities and agencies1,275 (107)68,444 (12,307)69,719 (12,414)
Commercial - Non-government agencies— — 5,425 (7)5,425 (7)
Total$30,478 $(349)$569,919 $(90,062)$600,397 $(90,411)
Less Than 12 Months12 Months or LongerTotal
(dollars in thousands)Fair ValueUnrecognized LossesFair ValueUnrecognized LossesFair ValueUnrecognized Losses
September 30, 2024
Held-to-maturity:
Debt securities:
States and political subdivisions$— $— $34,730 $(7,283)$34,730 $(7,283)
Mortgage-backed securities:
Residential - U.S. government-sponsored entities and agencies— — 504,405 (51,907)504,405 (51,907)
Total$— $— $539,135 $(59,190)$539,135 $(59,190)

Less Than 12 Months12 Months or LongerTotal
(dollars in thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
December 31, 2023
Available-for-sale:
Debt securities:      
States and political subdivisions$534 $(1)$114,601 $(29,809)$115,135 $(29,810)
Corporate securities— — 31,414 (4,317)31,414 (4,317)
U.S. Treasury and other government-sponsored entities and agencies2,893 (87)16,286 (1,854)19,179 (1,941)
Mortgage-backed securities:      
Residential - U.S. government-sponsored entities and agencies— — 367,887 (63,607)367,887 (63,607)
Residential - Non-government agencies— — 8,169 (980)8,169 (980)
Commercial - U.S. government-sponsored entities and agencies6,467 (1)44,447 (7,403)50,914 (7,404)
Commercial - Non-government agencies9,663 (130)5,293 (58)14,956 (188)
Total$19,557 $(219)$588,097 $(108,028)$607,654 $(108,247)

Less Than 12 Months12 Months or LongerTotal
(dollars in thousands)Fair ValueUnrecognized LossesFair ValueUnrecognized LossesFair ValueUnrecognized Losses
December 31, 2023
Held-to-maturity:
Debt securities:
States and political subdivisions$— $— $35,253 $(6,706)$35,253 $(6,706)
Mortgage-backed securities:
Residential - U.S. government-sponsored entities and agencies8,853 (33)512,378 (60,482)521,231 (60,515)
Total$8,853 $(33)$547,631 $(67,188)$556,484 $(67,221)