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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]    
Schedule of Amortized, Gross Unrealized Gains and Losses, and Fair Value on Investment Securities, Available for Sale
The following tables present the amortized cost and fair value of investment securities, and the corresponding amounts of gross unrealized and unrecognized gains and losses including the corresponding amounts of gross unrealized gains and losses on investment securities available for sale recognized in AOCI, at the dates indicated:
September 30, 2025
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
(Dollars in thousands)
Investment securities available for sale:
U.S. government and agency securities$13,276 $— $(1,634)$11,642 
Municipal securities59,581 19 (8,403)51,197 
Residential CMO and MBS(1)
321,733 1,487 (24,483)298,737 
Commercial CMO and MBS(1)
265,917 696 (10,618)255,995 
Corporate obligations7,000 63 (44)7,019 
Other asset-backed securities6,601 40 — 6,641 
Total$674,108 $2,305 $(45,182)$631,231 
(1) U.S. government agency and government-sponsored enterprise CMO and MBS.
December 31, 2024
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
(Dollars in thousands)
Investment securities available for sale:
U.S. government and agency securities$14,934 $— $(2,390)$12,544 
Municipal securities61,169 12 (10,239)50,942 
Residential CMO and MBS(1)
407,520 711 (38,900)369,331 
Commercial CMO and MBS(1)
330,249 134 (20,642)309,741 
Corporate obligations11,700 181 (111)11,770 
Other asset-backed securities10,020 47 (1)10,066 
Total$835,592 $1,085 $(72,283)$764,394 
(1) U.S. government agency and government-sponsored enterprise CMO and MBS.
Schedule of Amortized, Gross Unrecognized Gains and Losses, and Fair Value on Investment Securities, Held to Maturity
September 30, 2025
Amortized
Cost		Gross
Unrecognized
Gains		Gross
Unrecognized
Losses		Fair
Value
(Dollars in thousands)
Investment securities held to maturity:
U.S. government and agency securities$151,297 $— $(21,846)$129,451 
Residential CMO and MBS(1)
224,654 88 (10,188)214,554 
Commercial CMO and MBS(1)
305,675 22 (21,653)284,044 
Total$681,626 $110 $(53,687)$628,049 
(1) U.S. government agency and government-sponsored enterprise CMO and MBS.
December 31, 2024
Amortized
Cost		Gross
Unrecognized
Gains		Gross
Unrecognized
Losses		Fair
Value
(Dollars in thousands)
Investment securities held to maturity:
U.S. government and agency securities$151,216 $— $(28,874)$122,342 
Residential CMO and MBS(1)
244,309 — (18,563)225,746 
Commercial CMO and MBS(1)
307,760 27 (32,423)275,364 
Total$703,285 $27 $(79,860)$623,452 
(1) U.S. government agency and government-sponsored enterprise CMO and MBS.
Schedule of Amortized Cost and Fair Value Classified by Contractual Maturity Date on Investment Securities
The following table presents the amortized cost and fair value of investment securities by contractual maturity at the date indicated. Actual maturities may differ from contractual maturities because certain borrowers have the right to call or prepay obligations with or without call or prepayment penalties.
September 30, 2025
Securities Available for SaleSecurities Held to Maturity
Amortized CostFair ValueAmortized CostFair Value
(Dollars in thousands)
Due in one year or less$500 $501 $— $— 
Due after one year through five years8,938 8,770 — — 
Due after five years through ten years39,423 35,540 101,554 89,544 
Due after ten years30,996 25,047 49,743 39,907 
Total investment securities due at a single maturity date79,857 69,858 151,297 129,451 
MBS(1)
594,251 561,373 530,329 498,598 
Total investment securities$674,108 $631,231 $681,626 $628,049 
(1) MBS, which have prepayment provisions, are not assigned to maturity categories due to fluctuations in their payment speed.
  
Schedule of Unrealized Losses on Investment Securities Available for Sale Unrealized Losses on Investment Securities Available for Sale
The following tables present the gross unrealized losses and fair value of the Company’s investment securities available for sale for which an ACL on investment securities available for sale has not been recorded, aggregated by investment category and length of time the individual securities have been in a continuous unrealized loss position at the dates indicated:
September 30, 2025
Less than 12 Months12 Months or LongerTotal
Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
(Dollars in thousands)
U.S. government and agency securities$— $— $11,642 $(1,634)$11,642 $(1,634)
Municipal securities
1,247 — *45,486 (8,403)46,733 (8,403)
Residential CMO and MBS(1)
1,775 (7)181,249 (24,476)183,024 (24,483)
Commercial CMO and MBS(1)
6,939 (6)154,811 (10,612)161,750 (10,618)
Corporate obligations— — 3,956 (44)3,956 (44)
Other asset-backed securities1,444 — *— — 1,444 — *
Total$11,405 $(13)$397,144 $(45,169)$408,549 $(45,182)
* Unrealized losses less than one thousand dollars
(1) U.S. government agency and government-sponsored enterprise CMO and MBS.
December 31, 2024
Less than 12 Months12 Months or LongerTotal
Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
(Dollars in thousands)
U.S. government and agency securities$— $— $12,544 $(2,390)$12,544 $(2,390)
Municipal securities— — 45,157 (10,239)45,157 (10,239)
Residential CMO and MBS(1)
25,126 (321)232,903 (38,579)258,029 (38,900)
Commercial CMO and MBS(1)
17,772 (86)270,897 (20,556)288,669 (20,642)
Corporate obligations— — 3,890 (111)3,890 (111)
Other asset-backed securities1,568 (1)— — 1,568 (1)
Total$44,466 $(408)$565,391 $(71,875)$609,857 $(72,283)
(1) U.S. government agency and government-sponsored enterprise CMO and MBS.
  
Schedule of Realized Gains and Losses on Sale of Investment Securities Available for Sale Realized Gains and Losses
The following table presents the gross realized gains and losses on the sale of investment securities available for sale determined using the specific identification method for the dates indicated:
Three Months Ended
September 30,		Nine Months Ended
September 30,
2025202420252024
(Dollars in thousands)
Gross realized gains$— $— $— $— 
Gross realized losses— (6,945)(10,741)(18,839)
Net realized losses$— $(6,945)$(10,741)$(18,839)
  
Schedule of Amortized Cost and Fair Value of Investment Securities Pledged as Collateral Pledged Securities
The following table summarizes the amortized cost and fair value of investment securities that were pledged as collateral for the following obligations at the dates indicated:
September 30, 2025December 31, 2024
Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
(Dollars in thousands)
State and local governments public deposits$226,998 $217,525 $236,047 $220,104 
FRB399,815 360,030 434,534 373,410 
Other securities pledged55,447 51,059 53,296 48,169 
Total$682,260 $628,614 $723,877 $641,683