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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost and Estimated Fair Values of Investment Securities Available-For-Sale

The amortized cost and estimated fair values of investment securities are summarized below.

AVAILABLE-FOR-SALE:

 

       Gross   Gross     
   Amortized   Unrealized   Unrealized     
(Dollars in thousands)  Cost   Gains   Losses   Fair Value 
September 30, 2025                    
US Treasury securities  $25,696   $9   $(1,832)  $23,873 
Government Sponsored Enterprises   2,500    —    (260)   2,240 
Mortgage-backed securities   268,704    437    (11,835)   257,306 
Small Business Administration pools   9,504    16    (241)   9,279 
Corporate and other securities   7,506    —    (675)   6,831 
Total  $313,910   $462   $(14,843)  $299,529 
                     
       Gross   Gross     
   Amortized   Unrealized   Unrealized     
(Dollars in thousands)  Cost   Gains   Losses   Fair Value 
December 31, 2024                    
US Treasury securities  $15,822   $—   $(2,582)  $13,240 
Government Sponsored Enterprises   2,500    —    (390)   2,110 
Mortgage-backed securities   260,023    40    (15,859)   244,204 
Small Business Administration pools   12,437    15    (373)   12,079 
Corporate and other securities   8,755    —    (806)   7,949 
Total  $299,537   $55   $(20,010)  $279,582 
Schedule of Amortized Cost and Estimated Fair Values of Investment Securities Held-To-Maturity

HELD-TO-MATURITY:

 

(Dollars in thousands)  Amortized Cost
Net of
Allowance
for Credit Losses		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Fair Value 
September 30, 2025                    
Mortgage-backed securities  $96,816   $—   $(5,439)  $91,377 
State and local government   101,988    73    (2,169)   99,892 
Total  $198,805   $73   $(7,608)  $191,270 
                     
(Dollars in thousands)  Amortized Cost
Net of
Allowance
for Credit Loss		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Fair Value 
December 31, 2024                    
Mortgage-backed securities  $105,563    —    (8,645)  $96,918 
State and local government   103,850    —    (4,728)   99,122 
Total  $209,413    —    (13,373)  $196,040 
Schedule of gross unrealized losses and fair values, aggregated by investment category and length of time that individual securities have been in a continuous loss position.

The following tables show gross unrealized losses and fair values of available-for-sale securities for which an allowance for credit losses has not been recorded, aggregated by investment category and length of time that individual securities have been in a continuous loss position, as of September 30, 2025.

 

September 30, 2025  Less than 12 months   12 months or more   Total 
Available-for-sale securities:  Fair   Unrealized   Fair   Unrealized   Fair   Unrealized 
(Dollars in thousands)  Value   Loss   Value   Loss   Value   Loss 
US Treasury securities  $—   $—   $14,012   $1,832   $14,012   $1,832 
Government Sponsored Enterprises   —    —    2,240    260    2,240    260 
Mortgage-backed securities   5,514    9    208,305    11,826    213,819    11,835 
Small Business Administration pools   920    4    6,283    237    7,203    241 
Corporate and other securities   —    —    6,818    675    6,818    675 
Total  $6,434   $13   $237,658   $14,830   $244,092   $14,843 

 

The following table shows gross unrealized losses by fair values of available-for-sale securities, aggregated by investment category and length of time that individual securities have been in a continuous loss position as of December 31, 2024.

                         
December 31, 2024  Less than 12 months   12 months or more   Total 
Available-for-sale securities:  Fair   Unrealized   Fair   Unrealized   Fair   Unrealized 
(Dollars in thousands)  Value   Loss   Value   Loss   Value   Loss 
US Treasury securities  $—   $—   $13,240   $2,582   $13,240   $2,582 
Government Sponsored Enterprises   —    —    2,110    390    2,110    390 
Mortgage-backed securities   14,310    150    216,452    15,709    230,762    15,859 
Small Business Administration pools   1,279    2    8,554    371    9,833    373 
Corporate and other securities   1,488    263    6,449    543    7,937    806 
Total  $17,077   $415   $246,805   $19,595   $263,882   $20,010 
Schedule of allowance for credit losses on held to maturity securities

The following table shows a roll forward of the allowance for credit losses on held to maturity securities for the three and nine months ended September 30, 2025 and 2024.

 

   Three Months 
   Ended 
(Dollars in thousands)  September 30, 2025 
Allowance for Credit Losses on Held-to-Maturity Securities:     
State and local government     
Beginning balance, June 30, 2025  $19 
Provision for credit losses   — 
Ending balance, September 30, 2025  $19 
      
   Three Months 
   Ended 
(Dollars in thousands)  September 30, 2024 
Allowance for Credit Losses on Held-to-Maturity Securities:     
State and local government     
Beginning balance, June 30, 2024  $27 
Release of credit losses   (3)
Ending balance, September 30, 2024  $24 

 

   Nine Months 
   Ended 
(Dollars in thousands)  September 30, 2025 
Allowance for Credit Losses on Held-to-Maturity Securities:     
State and local government     
Beginning balance, December 31, 2024  $23 
Release of credit losses   (4)
Ending balance, September 30, 2025  $19 
      
   Nine Months 
   Ended 
(Dollars in thousands)  September 30, 2024 
Allowance for Credit Losses on Held-to-Maturity Securities:     
State and local government     
Beginning balance, December 31, 2023  $30 
Release of credit losses   (6)
Ending balance, September 30, 2024  $24 
Schedule of amortized cost of debt securities held to maturity aggregated by credit quality indicators.

   As of   As of 
(Dollars in thousands)  September 30, 2025   December 31, 2024 
Rating:          
Aaa  $143,608   $149,064 
Aa1/Aa2/Aa3   50,168    55,318 
A1/A2   5,048    5,055 
Less: Allowance for Credit Losses on Held-to-Maturity Securities   19    23 
Total  $198,805   $209,413 
Schedule of Amortized Cost and Fair Value of Investment Securities

The following tables show the amortized cost and fair value of investment securities at September 30, 2025 by expected maturity. Expected maturities differ from contractual maturities because borrowers may have the right to call or prepay the obligations with or without prepayment penalties. Mortgage-backed securities are included in the year corresponding with the remaining expected life.

 

   Available-for-sale 
September 30, 2025  Amortized   Fair 
(Dollars in thousands)  Cost   Value 
Due in one year or less  $12,362   $12,347 
Due after one year through five years   13,361    13,146 
Due after five years through ten years   29,390    26,559 
Due after ten years   258,797    247,477 
Total  $313,910   $299,529 
           
   Held-To-Maturity 
September 30, 2025  Amortized   Fair 
(Dollars in thousands)  Cost   Value 
Due in one year or less  $7,121   $7,098 
Due after one year through five years   56,864    56,109 
Due after five years through ten years   60,679    59,486 
Due after ten years   74,160    68,596 
Allowance for Credit Losses on Held-to-Maturity Securities   (19)   (19)
Total  $198,805   $191,270