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Investment Securities
3 Months Ended
Mar. 31, 2026
Investments, Debt and Equity Securities [Abstract]  
Investment Securities
Note 3 – Investment Securities
The table below summarizes the Company's investment in AFS securities by major security type.
As of March 31, 2026
(dollars in thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
U.S. agency securities$332,381 $— $(17,318)$315,063 
Residential mortgage-backed securities597,422 65 (58,177)539,310 
Commercial mortgage-backed securities68,581 — (2,465)66,116 
Municipal bonds8,380 — (508)7,872 
Corporate bonds2,000 — (47)1,953 
Total available-for-sale securities$1,008,764 $65 $(78,515)$930,314 
As of December 31, 2025
(dollars in thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
U.S. agency securities$355,249 $— $(17,541)$337,708 
Residential mortgage-backed securities620,540 152 (58,188)562,504
Commercial mortgage-backed securities68,931 117 (2,503)66,545
Municipal bonds8,426 — (380)8,046
Corporate bonds2,000 — (33)1,967
Total available-for-sale securities$1,055,146 $269 $(78,645)$976,770 
The table below summarizes the Company's investment in HTM securities by major security type.
As of March 31, 2026
(dollars in thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Residential mortgage-backed securities$531,370 $— $(62,117)$469,253 
Commercial mortgage-backed securities85,189 — (10,006)75,183 
Municipal bonds106,813 — (8,221)98,592 
Corporate bonds118,808 120 (4,718)114,210 
Total842,180 $120 $(85,062)$757,238 
Less: Allowance for credit losses
(907)
Total held-to-maturity securities, net of ACL$841,273 
As of December 31, 2025
(dollars in thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Residential mortgage-backed securities$544,402 $— $(58,836)$485,566 
Commercial mortgage-backed securities85,760 — (9,787)75,973 
Municipal bonds106,875 — (6,933)99,942 
Corporate bonds118,773 (5,315)113,466 
Total855,810 $$(80,871)$774,947 
Less: Allowance for credit losses
(1,030)
Total held-to-maturity securities, net of ACL$854,780 
In addition, as of March 31, 2026 and December 31, 2025, the Company held $27.7 million and $28.3 million, respectively, in non-marketable equity securities in a combination of Federal Reserve System ("Federal Reserve Board", "Federal Reserve" or "FRB") and FHLB stocks, which are required to be held for regulatory purposes. These securities cannot be disposed of other than through redemption by the issuer and, if redeemed, would be redeemed at the original cost. The securities are carried at cost, classified as restricted securities, and periodically evaluated for impairment based on ultimate recovery of par value.
As of March 31, 2026 and December 31, 2025, the Company had $36.9 million and $38.5 million, respectively, of unamortized unrealized losses outstanding following the transfer of investment securities from AFS to HTM in 2022. These unrealized losses are included in accumulated other comprehensive loss and are amortized through interest income as a yield adjustment over the remaining term of the securities.
Accrued interest receivable on investment securities was $5.5 million as of March 31, 2026 and December 31, 2025. The accrued interest on investment securities is excluded from the amortized cost of the securities and is reported in other assets in the Consolidated Balance Sheets.
The table below summarizes, by length of time, the Company's AFS securities that have been in a continuous unrealized loss position and HTM securities that have been in a continuous unrecognized loss position.
As of March 31, 2026
Less than 12 Months12 Months or GreaterTotal
(dollars in thousands)Number of SecuritiesEstimated Fair ValueUnrealized LossesEstimated Fair ValueUnrealized LossesEstimated Fair ValueUnrealized Losses
Investment securities available-for-sale:
U.S. agency securities50 $— $— $315,063 $(17,318)$315,063 $(17,318)
Residential mortgage-backed securities141 17,423 (92)512,563 (58,085)529,986 (58,177)
Commercial mortgage-backed securities12 29,017 (31)37,099 (2,434)66,116 (2,465)
Municipal bonds— — 7,872 (508)7,872 (508)
Corporate bonds— — 1,953 (47)1,953 (47)
Total205 $46,440 $(123)$874,550 $(78,392)$920,990 $(78,515)
Investment securities held-to-maturity:
Residential mortgage-backed securities135 $— $— $469,253 $(62,117)$469,253 $(62,117)
Commercial mortgage-backed securities16 4,230 (531)70,953 (9,475)75,183 (10,006)
Municipal bonds33 — — 97,592 (8,221)97,592 (8,221)
Corporate bonds27 9,841 (29)97,386 (4,689)107,227 (4,718)
Total211 $14,071 $(560)$735,184 $(84,502)$749,255 $(85,062)

As of December 31, 2025
Less than 12 Months12 Months or GreaterTotal
(dollars in thousands)Number of SecuritiesEstimated Fair ValueUnrealized LossesEstimated Fair ValueUnrealized LossesEstimated Fair ValueUnrealized Losses
Investment securities available-for-sale:
U.S. agency securities52 $— $— $337,708 $(17,541)$337,708 $(17,541)
Residential mortgage-backed securities139 — — 546,514 (58,188)546,514 (58,188)
Commercial mortgage-backed securities10 — — 37,329 (2,503)37,329 (2,503)
Municipal bonds— — 8,046 (380)8,046 (380)
Corporate bonds— — 1,967 (33)1,967 (33)
Total203$— $— $931,564 $(78,645)$931,564 $(78,645)
Investment securities held-to-maturity:
Residential mortgage-backed securities136 $— $— $485,567 $(58,836)$485,567 $(58,836)
Commercial mortgage-backed securities16 4,271 (503)71,702 (9,284)75,973 (9,787)
Municipal bonds33 — — 98,942 (6,933)98,942 (6,933)
Corporate bonds27 1,922 (18)106,638 (5,297)108,560 (5,315)
Total212$6,193 $(521)$762,849 $(80,350)$769,042 $(80,871)
As of March 31, 2026, unrealized losses were generally attributable to changes in market interest rates and interest spread relationships subsequent to the dates the securities were originally purchased, and were considered to be temporary, and not due to credit quality concerns on the investment securities. The fair values of these AFS securities are expected to recover as the securities approach their respective maturity dates.
The Company measures its AFS and HTM securities portfolios for credit losses as part of its ACL analysis. For further information on provision for credit losses on AFS and HTM securities, see the "Allowance for Credit Losses" discussion in "Note 1 – Summary of Significant Accounting Policies". As of March 31, 2026 and December 31, 2025, the Company had an allowance for credit losses outstanding of zero on its AFS securities and $0.9 million and $1.0 million, respectively, on its HTM securities, each of which primarily comprise allowances for corporate bonds.
The table below summarizes the Company's investment in AFS securities and HTM securities by contractual maturity. Expected maturities for mortgage-backed securities ("MBS") will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
As of March 31, 2026
(dollars in thousands)Amortized CostEstimated Fair Value
Investment securities available-for-sale:
Within one year$70,454 $69,447 
One to five years226,437 213,471 
Five to ten years27,699 25,939 
Beyond ten years18,171 16,031 
Residential mortgage-backed securities597,422 539,310 
Commercial mortgage-backed securities68,581 66,116 
Less: allowance for credit losses— — 
Total investment securities available-for-sale1,008,764 930,314 
Investment securities held-to-maturity:
Within one year4,928 4,925 
One to five years71,030 69,073 
Five to ten years98,688 92,668 
Beyond ten years50,975 46,136 
Residential mortgage-backed securities: 531,370 469,253 
Commercial mortgage-backed securities85,189 75,183 
Less: allowance for credit losses(907)— 
Total investment securities held-to-maturity841,273 757,238 
Total$1,850,037 $1,687,552 
There were no sales and calls of investment securities during the three months ended March 31, 2026 and 2025, therefore, no proceeds from sales or calls in either period.
As of March 31, 2026 and December 31, 2025, the book value of securities pledged as collateral for certain government deposits, securities sold under agreements to repurchase and certain lines of credit with correspondent banks was $16.0 million and $519.6 million, respectively.
As of March 31, 2026 and December 31, 2025, there were no holdings of securities of any one issuer, other than the U.S. agency securities, which exceeded ten percent of shareholders’ equity.