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Securities
 6 Months Ended
Jun. 30, 2025
Investments, Debt and Equity Securities [Abstract]  
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure SECURITIES
    
Trading Securities
The Company had trading securities of $4.8 million and $4.2 million as of June 30, 2025 and December 31, 2024, respectively. These securities are held in a rabbi trust and will be used for future payments associated with the Company’s non-qualified 401(k) Restoration Plan and Non-qualified Deferred Compensation Plan.
Equity Securities
The Company had equity securities of $21.3 million and $21.2 million as of June 30, 2025 and December 31, 2024, respectively. These securities consist primarily of mutual funds held in a rabbi trust and will be used for future payments associated with the Company’s supplemental executive retirement plans.
The following table represents a summary of the gains and losses recognized within non-interest income and non-interest expense within the Consolidated Statements of Income that relate to equity securities for the periods indicated:
Three Months EndedSix Months Ended
June 30June 30
2025202420252024
Dollars in thousands
Net gains (losses) recognized during the period on equity securities$71 $(107)$169 $502 
Less: net gains recognized during the period on equity securities sold during the period— 3 6 438 
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date$71 $(110)$163 $64 
Available for Sale Securities
The following table summarizes the amortized cost, allowance for credit losses, and fair value of available for sale securities and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income (loss) at the dates indicated:
 June 30, 2025December 31, 2024
 Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Allowance for credit lossesFair
Value		Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Allowance for credit lossesFair
Value
 (Dollars in thousands)
U.S. government agency securities$229,078 $— $(13,808)$— $215,270 $229,452 $— $(19,792)$— $209,660 
U.S. treasury securities528,500 — (22,797)— 505,703 628,017 — (36,016)— 592,001 
Agency mortgage-backed securities522,406 2,242 (27,312)— 497,336 415,918 25 (37,782)— 378,161 
Agency collateralized mortgage obligations28,834 2 (1,613)— 27,223 31,168 1 (2,174)— 28,995 
State, county, and municipal securities198 — (1)— 197 197 — (3)— 194 
Pooled trust preferred securities issued by banks and insurers 1,120 — (82)— 1,038 1,180 — (85)— 1,095 
Small business administration pooled securities45,195 — (5,644)— 39,551 48,032 — (7,194)— 40,838 
Total available for sale securities$1,355,331 $2,244 $(71,257)$— $1,286,318 $1,353,964 $26 $(103,046)$— $1,250,944 

Excluded from the table above is accrued interest on available for sale securities of $3.0 million and $2.9 million at June 30, 2025 and December 31, 2024, respectively, which is included within other assets on the Consolidated Balance Sheets. The Company did not record any write-offs of accrued interest income on available for sale securities during the three and six months ended June 30, 2025 and 2024. Furthermore, no securities held by the Company were delinquent on contractual payments nor were any securities placed on non-accrual status at June 30, 2025 and December 31, 2024.

When securities are sold, the adjusted cost of the specific security sold is used to compute the gain or loss on the sale. The Company had no sales of securities available for sale during the three and six months ended June 30, 2025 and 2024, and therefore no gains or losses were realized for such periods.
The following tables show the gross unrealized losses and fair value of the Company’s available for sale securities in an unrealized loss position as of the dates indicated. These available for sale securities are aggregated by major security type and length of time that individual securities have been in a continuous unrealized loss position:
 June 30, 2025
  Less than 12 months12 months or longerTotal
 # of 
holdings		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
 (Dollars in thousands)
U.S. government agency securities9 $— $— $215,270 $(13,808)$215,270 $(13,808)
U.S. treasury securities11 — — 505,703 (22,797)505,703 (22,797)
Agency mortgage-backed securities107 45,806 (940)248,583 (26,372)294,389 (27,312)
Agency collateralized mortgage obligations11 1,097 (3)25,253 (1,610)26,350 (1,613)
State, county, and municipal securities1 197 (1)— — 197 (1)
Pooled trust preferred securities issued by banks and insurers1 — — 1,038 (82)1,038 (82)
Small business administration pooled securities8 — — 39,551 (5,644)39,551 (5,644)
Total 148 $47,100 $(944)$1,035,398 $(70,313)$1,082,498 $(71,257)
December 31, 2024
Less than 12 months12 months or longerTotal
# of 
holdings		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
(Dollars in thousands)
U.S. government agency securities9 $— $— $209,660 $(19,792)$209,660 $(19,792)
U.S. treasury securities13 — — 592,001 (36,016)592,001 (36,016)
Agency mortgage-backed securities117 127,152 (2,867)249,098 (34,915)376,250 (37,782)
Agency collateralized mortgage obligations11 1,153 (4)26,890 (2,170)28,043 (2,174)
State, county, and municipal securities1 194 (3)— — 194 (3)
Pooled trust preferred securities issued by banks and insurers1 — — 1,095 (85)1,095 (85)
Small business administration pooled securities8 — — 40,838 (7,194)40,838 (7,194)
Total 160 $128,499 $(2,874)$1,119,582 $(100,172)$1,248,081 $(103,046)
The Company does not intend to sell these investments and has determined, based upon available evidence, that it is more likely than not that the Company will not be required to sell each security before the recovery of its amortized cost basis. In addition, management does not believe that any of the securities are impaired due to reasons of credit quality. As a result, the Company did not recognize a provision for credit losses on these investments during the three and six months ended June 30, 2025 and 2024. The Company made this determination by reviewing various qualitative and quantitative factors regarding each investment category, such as current market conditions, extent and nature of changes in fair value, issuer rating changes and trends, volatility of earnings, and current analysts’ evaluations.
As a result of the Company’s review of these qualitative and quantitative factors, the causes of the impairments listed in the table above by category were as follows at June 30, 2025:
•U.S. Government Agency Securities, U.S. Treasury Securities, Agency Mortgage-Backed Securities, Agency Collateralized Mortgage Obligations and Small Business Administration Pooled Securities: These portfolios have contractual terms that generally do not permit the issuer to settle the securities at a price less than the current par value of the investment. The decline in market value of these securities is attributable to changes in interest rates and not credit quality. Additionally, these securities are implicitly guaranteed by the U.S. Government or one of its agencies.
•State, County and Municipal Securities: This portfolio has contractual terms that generally do not permit the issuer to settle the securities at a price less than the current par value of the investment. The decline in market value of these securities is attributable to changes in interest rates and not credit quality.
•Pooled Trust Preferred Securities: This portfolio consists of one security which is performing. The unrealized loss on this security is attributable to the illiquid nature of the trust preferred market in the current economic and regulatory environment. Management evaluates collateral credit and instrument structure, including current and expected deferral and default rates and timing. In addition, discount rates are determined by evaluating comparable spreads observed currently in the market for similar instruments.

Held to Maturity Securities
The following table summarizes the amortized cost, fair value and allowance for credit losses of held to maturity securities and the corresponding amounts of gross unrealized gains and losses recognized at the dates indicated:
 June 30, 2025December 31, 2024
 Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Allowance for credit lossesFair
Value		Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Allowance for credit lossesFair
Value
 (Dollars in thousands)
U.S. treasury securities$100,831 $— $(5,311)$— $95,520 $100,791 $— $(7,769)$— $93,022 
Agency mortgage-backed securities769,077 196 (45,623)— 723,650 788,470 90 (62,198)— 726,362 
Agency collateralized mortgage obligations395,526 — (53,103)— 342,423 422,827 — (65,143)— 357,684 
Small business administration pooled securities117,469 31 (5,403)— 112,097 122,868 — (8,135)— 114,733 
Total held to maturity securities$1,382,903 $227 $(109,440)$— $1,273,690 $1,434,956 $90 $(143,245)$— $1,291,801 
Substantially all held to maturity securities held by the Company are guaranteed by the U.S. federal government or other government sponsored agencies and have a long history of no credit losses. As a result, management has determined these securities to have a zero loss expectation and therefore the Company did not record a provision for estimated credit losses on any held to maturity securities during the three and six months ended June 30, 2025 and 2024. Excluded from the table above is accrued interest on held to maturity securities of $3.6 million and $3.8 million at June 30, 2025 and December 31, 2024, respectively, which is included within other assets on the Consolidated Balance Sheets. The Company did not record any write-offs of accrued interest income on held to maturity securities during the three and six months ended June 30, 2025 and 2024. Furthermore, no securities held by the Company were delinquent on contractual payments nor were any securities placed on non-accrual status at June 30, 2025 and December 31, 2024.

When securities are sold, the adjusted cost of the specific security sold is used to compute the gain or loss on the sale. The Company had no sales of held to maturity securities during the three and six months ended June 30, 2025 and 2024, and therefore no gains or losses were realized for such periods.

The Company monitors the credit quality of held to maturity securities through the use of credit ratings. Credit ratings are monitored by the Company on at least a quarterly basis. As of June 30, 2025, all held to maturity securities held by the Company were rated investment grade or higher.
The actual maturities of certain available for sale or held to maturity securities may differ from the contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. A schedule of the contractual maturities of securities available for sale and securities held to maturity at June 30, 2025 is presented below:
Due in one year or lessDue after one year to five yearsDue after five to ten yearsDue after ten yearsTotal
Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
(Dollars in thousands)
Available for sale securities
U.S. government agency securities$— $— $229,078 $215,270 $— $— $— $— $229,078 $215,270 
U.S. treasury securities144,887 142,031 383,613 363,672 — — — — 528,500 505,703 
Agency mortgage-backed securities83 83 208,530 200,868 48,103 43,750 265,690 252,635 522,406 497,336 
Agency collateralized mortgage obligations— — — — 2,212 2,074 26,622 25,149 28,834 27,223 
State, county, and municipal securities— — 198 197 — — — — 198 197 
Pooled trust preferred securities issued by banks and insurers — — — — — — 1,120 1,038 1,120 1,038 
Small business administration pooled securities— — — — 11,565 10,785 33,630 28,766 45,195 39,551 
Total available for sale securities$144,970 $142,114 $821,419 $780,007 $61,880 $56,609 $327,062 $307,588 $1,355,331 $1,286,318 
Held to maturity securities
U.S. treasury securities$— $— $99,838 $94,664 $993 $856 $— $— $100,831 $95,520 
Agency mortgage-backed securities78,996 78,171 386,797 367,598 160,809 144,828 142,475 133,053 769,077 723,650 
Agency collateralized mortgage obligations— — 60,364 57,763 14,810 13,440 320,352 271,220 395,526 342,423 
Small business administration pooled securities— — — — 5,781 5,456 111,688 106,641 117,469 112,097 
Total held to maturity securities$78,996 $78,171 $546,999 $520,025 $182,393 $164,580 $574,515 $510,914 $1,382,903 $1,273,690 
Total$223,966 $220,285 $1,368,418 $1,300,032 $244,273 $221,189 $901,577 $818,502 $2,738,234 $2,560,008 
Included in the table above is $25.2 million of callable securities at June 30, 2025.
The carrying value of securities pledged to secure public funds, trust deposits, and for other purposes, as required or permitted by law, was $2.1 billion at June 30, 2025 and December 31, 2024.
At June 30, 2025 and December 31, 2024, the Company had no investments in obligations of individual states, counties, or municipalities which exceeded 10% of consolidated stockholders’ equity.