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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2025
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost, Estimated Fair Value and Allowance for Credit Losses of HTM Securities and AFS Securities by Contractual Maturities
The following table shows the amortized cost, the estimated fair value and the allowance for credit losses of the held-to-maturity securities and available-for-sale securities at June 30, 2025 and December 31, 2024, by contractual maturity within each type:
 At June 30, 2025
(Dollars in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Allowance for Credit LossesFair Value
Securities Held-to-Maturity
Residential mortgage-backed securities:
After 1 year to 5 years$796 $— $(13)$— $783 
After 5 years to 10 years11,990 — (350)— 11,640 
Over 10 years115,669 — (14,926)— 100,743 
128,455 — (15,289)— 113,166 
Total$128,455 $— $(15,289)$— $113,166 
Securities Available-for-Sale
Residential mortgage-backed securities:
Within 1 year$6 $— $— $— $6 
After 1 year to 5 years206 — (3)— 203 
After 5 years to 10 years10,121 — (513)— 9,608 
Over 10 years310,920 748 (30,327)— 281,341 
321,253 748 (30,843)— 291,158 
Collateralized mortgage obligations:
After 1 year to 5 years112 — (2)— 110 
Over 10 years1,528 — (97)— 1,431 
1,640 — (99)— 1,541 
Corporate bonds:
Within 1 year8,889 5 (94)(6)8,794 
After 1 year to 5 years48,394 66 (2,613)(11)45,836 
After 5 years to 10 years20,500 15 (1,423)— 19,092 
77,783 86 (4,130)(17)73,722 
Total$400,676 $834 $(35,072)$(17)$366,421 
 At December 31, 2024
(Dollars in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Allowance for Credit LossesFair Value
Securities Held-to-Maturity
Residential mortgage-backed securities:
After 1 year to 5 years$1,114 $— $(24)$— $1,090 
After 5 years to 10 years10,208 — (450)— 9,758 
Over 10 years122,789 — (18,630)— 104,159 
134,111 — (19,104)— 115,007 
Total$134,111 $— $(19,104)$— $115,007 
Securities Available-for-Sale
State and political subdivisions:
Within 1 year$1,300 $— $(5)$— $1,295 
1,300 — (5)— 1,295 
Residential mortgage-backed securities:
Within 1 year20 — — — 20 
After 1 year to 5 years298 — (6)— 292 
After 5 years to 10 years11,260 — (791)— 10,469 
Over 10 years311,126 119 (38,645)— 272,600 
322,704 119 (39,442)— 283,381 
Collateralized mortgage obligations:
After 1 year to 5 years155 — (4)— 151 
Over 10 years1,663 — (129)— 1,534 
1,818 — (133)— 1,685 
Corporate bonds:
Within 1 year5,905 5 (58)(6)5,846 
After 1 year to 5 years10,924 16 (303)(31)10,606 
After 5 years to 10 years60,000 — (4,650)(802)54,548 
76,829 21 (5,011)(839)71,000 
Total$402,651 $140 $(44,591)$(839)$357,361 
Available-for-sale Securities, Allowance for Credit Loss Rollforward
The table below presents a roll forward by major security type for the six months ended June 30, 2025 and June 30, 2024 of the allowance for credit losses on securities available-for-sale.

(Dollars in thousands)Corporate Bonds
Six months ended June 30, 2025
Securities Available-for-Sale
Beginning balance$(839)
Change in securities for which a previous expected credit loss was recognized822 
Ending balance$(17)
Six months ended June 30, 2024
Securities Available-for-Sale
Beginning balance$(731)
Additions for securities for which no previous expected credit losses were recognized(1)
Change in securities for which a previous expected credit loss was recognized(49)
Ending balance$(781)
Unrealized Gain (Loss) on Investments
The following table shows the fair value of securities that were in an unrealized loss position for which an allowance for credit losses has not been recorded at June 30, 2025 and December 31, 2024, by the length of time those securities were in a continuous loss position.
 Less than
Twelve Months		Twelve Months
or Longer		Total
(Dollars in thousands)Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses
At June 30, 2025
Securities Held-to-Maturity
Residential mortgage-backed securities$2,573 $(17)$109,356 $(15,272)$111,929 $(15,289)
Total$2,573 $(17)$109,356 $(15,272)$111,929 $(15,289)
Securities Available-for-Sale
Residential mortgage-backed securities$25,762 $(151)$201,199 $(30,692)$226,961 $(30,843)
Collateralized mortgage obligations— — 1,542 (99)1,542 (99)
Corporate bonds996 (2)56,977 (3,938)57,973 (3,940)
Total$26,758 $(153)$259,718 $(34,729)$286,476 $(34,882)
At December 31, 2024
Securities Held-to-Maturity
Residential mortgage-backed securities$2,566 $(50)$112,441 $(19,054)$115,007 $(19,104)
Total$2,566 $(50)$112,441 $(19,054)$115,007 $(19,104)
Securities Available-for-Sale
Residential mortgage-backed securities$65,044 $(905)$205,071 $(38,537)$270,115 $(39,442)
Collateralized mortgage obligations— — 1,685 (133)1,685 (133)
Total$65,044 $(905)$206,756 $(38,670)$271,800 $(39,575)