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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2023
Securities Financing Transactions Disclosures [Abstract]  
Unrealized Gain (Loss) on Investments
The amortized cost and fair value on investment securities as of December 31 are as follows:
December 31, 2023
(In thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Estimated
Fair Value
Available-for-sale
U.S. Treasury and U.S. government agencies$36,637 $— $988 $35,649 
Mortgage-backed U.S. government agencies169,184 — 16,501 152,683 
State and political subdivision obligations4,332 — 686 3,646 
Corporate debt securities35,733 — 4,156 31,577 
Total available-for-sale debt securities$245,886 $— $22,331 $223,555 
Held-to-maturity
U.S. Treasury and U.S. government agencies$245,805 $2 $28,676 $217,131 
Mortgage-backed U.S. government agencies43,818 — 5,523 38,295 
State and political subdivision obligations84,035 11 6,486 77,560 
Corporate debt securities25,470 — 935 24,535 
Total held-to-maturity debt securities399,128 13 41,620 357,521 
Total$645,014 $13 $63,951 $581,076 
December 31, 2022
(In thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Estimated
Fair Value
Available-for-sale
U.S. Treasury and U.S. government agencies$36,528 $— $1,614 $34,914 
Mortgage-backed U.S. government agencies185,993 — 19,078 166,915 
State and political subdivision obligations4,354 — 815 3,539 
Corporate debt securities35,467 — 2,957 32,510 
Total available-for-sale debt securities$262,342 $— $24,464 $237,878 
Held-to-maturity
U.S. Treasury and U.S. government agencies$245,671 $— $34,834 $210,837 
Mortgage-backed U.S. government agencies50,710 — 6,676 44,034 
State and political subdivision obligations87,125 — 8,345 78,780 
Corporate debt securities15,988 — 1,134 14,854 
Total held-to-maturity debt securities399,494 — 50,989 348,505 
Total$661,836 $— $75,453 $586,383 
Schedule of Fair Value and Unrealized Loss on Investments in a Continuous Unrealized Loss Position
The following table presents gross unrealized losses and fair value of investments aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at December 31, 2023 and 2022.
(Dollars in thousands)Less Than 12 Months12 Months or MoreTotal
December 31, 2023Number
of
Securities		Estimated
Fair
Value		Gross
Unrealized
Losses		Number
of
Securities		Estimated
Fair
Value		Gross
Unrealized
Losses		Number
of
Securities		Estimated
Fair
Value		Gross
Unrealized
Losses
Available-for-sale debt securities:
U.S. Treasury and U.S. government agencies—$— $— 19$35,649 $988 19$35,649 $988 
Mortgage-backed U.S. government agencies14,015 26 92148,668 16,475 93152,683 16,501 
State and political subdivision obligations—— — 83,646 686 83,646 686 
Corporate debt securities1410 90 1731,167 4,066 1831,577 4,156 
Total available-for-sale debt securities24,425 116 136219,130 22,215 138223,555 22,331 
Held-to-maturity debt securities:
U.S. Treasury and U.S. government agencies12,002 — 144215,129 28,676 145217,131 28,676 
Mortgage-backed U.S. government agencies—— — 6438,295 5,523 6438,295 5,523 
State and political subdivision obligations258,729 63 17068,831 6,423 19577,560 6,486 
Corporate debt securities1936 57 1423,599 878 1524,535 935 
Total held-to-maturity debt securities2711,667 120 392345,854 41,500 419357,521 41,620 
Total29$16,092 $236 528$564,984 $63,715 557$581,076 $63,951 
(Dollars in thousands)Less Than 12 Months12 Months or MoreTotal
December 31, 2022Number
of
Securities		Estimated
Fair
Value		Gross
Unrealized
Losses		Number
of
Securities		Estimated
Fair
Value		Gross
Unrealized
Losses		Number
of
Securities		Estimated
Fair
Value		Gross
Unrealized
Losses
Available-for-sale securities:
U.S. Treasury and U.S. government agencies19$34,914 $1,614 —$— $— 19$34,914 $1,614 
Mortgage-backed U.S. government agencies69131,879 11,876 2435,036 7,202 93166,915 19,078 
State and political subdivision obligations62,521 671 21,018 144 83,539 815 
Corporate debt securities1225,063 2,153 44,196 804 1629,259 2,957 
Total available-for-sale securities106194,377 16,314 3040,250 8,150 136234,627 24,464 
Held-to-maturity securities:
U.S. Treasury and U.S. government agencies5484,946 10,093 91125,891 24,741 145210,837 34,834 
Mortgage-backed U.S. government agencies4013,866 1,071 2430,168 5,605 6444,034 6,676 
State and political subdivision obligations18573,735 7,413 184,616 932 20378,351 8,345 
Corporate debt securities45,721 317 55,182 817 910,903 1,134 
Total held to maturity securities283178,268 18,894 138165,857 32,095 421344,125 50,989 
Total389$372,645 $35,208 168$206,107 $40,245 557$578,752 $75,453 
Schedule of Gross Realized Gains (Losses) on Sales of Available-For-Sale Securities
The following table presents information related to gross realized gains and losses on sales of AFS securities:
For the year ended December 31,
(In thousands)202320222021
Gross realized gains$— $— $79 
Gross realized losses— — — 
Net gains$— $— $79 
Investments Classified by Contractual Maturity Date
The table below illustrates the contractual maturity of debt investment securities at amortized cost and estimated fair value. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay with or without call or prepayment penalties.
(In thousands)Available-for-saleHeld-to-maturity
December 31, 2023Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in 1 year or less$12,494 $12,340 $9,708 $9,627 
Due after 1 year but within 5 years32,400 30,977 130,686 123,005 
Due after 5 years but within 10 years29,474 25,614 191,793 166,811 
Due after 10 years2,334 1,941 23,123 19,783 
76,702 70,872 355,310 319,226 
Mortgage-backed securities169,184 152,683 43,818 38,295 
$245,886 $223,555 $399,128 $357,521