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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract]  
Equity Securities without Readily Determinable Fair Value
December 31,
20252024
Equity securities:(dollars in thousands)
Common and preferred stock with readily determinable fair value$- $724 
Federal Home Loan Bank stock10,634 10,708 
Federal Reserve Bank stock26,057 26,057 
Other - no readily determinable fair value11,510 11,281 
Total equity securities$48,200 $48,770 
Schedule of Unrealized Gain (Loss) on Investments
The following tables show the carrying amount, gross unrealized holding gains, gross unrealized holding losses, and fair value of AFS and HTM securities by security type at December 31, 2025 and 2024.
As of December 31, 2025
Amortized
cost		Gross
unrealized
gains		Gross
unrealized
losses		Fair valuesAllowance
for credit
losses		Net
carrying
amount
Available for sale securities:(dollars in thousands)
U.S. Treasury securities$918,922 $10,561 $(1,196)$928,287 $- $928,287 
U.S. Agency debentures132,692 177 (413)132,456 - 132,456 
U.S. Agency mortgage-backed securities5,345,130 46,346 (102,899)5,288,577 - 5,288,577 
Obligations of states and
  political subdivisions
16,595 87 (38)16,644 - 16,644 
Other securities6,535 - (36)6,499 - 6,499 
Total available for sale securities$6,419,874 $57,171 $(104,582)$6,372,463 $- $6,372,463 
Held to maturity:
U.S. Agency mortgage-backed securities$21 $1 $- $22 $- $22 
Obligations of states and political subdivisions1,678 - - 1,678 (10)1,668 
Total held to maturity securities$1,699 $1 $- $1,700 $(10)$1,690 
As of December 31, 2024
Amortized
cost		Gross
unrealized
gains		Gross
unrealized
losses		Fair valuesAllowance
for credit
losses		Net
carrying
amount
Available for sale securities:(dollars in thousands)
U.S. Treasury securities$1,291,137 $752 $(22,336)$1,269,553 $- $1,269,553 
U.S. Agency debentures373,869 54 (4,635)369,288 - 369,288 
U.S. Agency mortgage-backed securities4,078,956 6,535 (170,739)3,914,752 - 3,914,752 
Obligations of states and
  political subdivisions
21,274 79 (212)21,141 - 21,141 
Other securities29,648 12 (671)28,989 - 28,989 
Total available for sale securities$5,794,884 $7,432 $(198,593)$5,603,723 $- $5,603,723 
Held to maturity:
U.S. Agency mortgage-backed securities$25 $1 $- $26 $- $26 
Obligations of states and political subdivisions3,221 - (16)3,205 (21)3,184 
Total held to maturity securities$3,246 $1 $(16)$3,231 $(21)$3,210 
Schedule of Fair Value of Available for Sale Securities by Contractual Maturities
The amortized cost and fair value of AFS and HTM securities at December 31, 2025, by contractual maturity, are shown below:
December 31, 2025
U.S. government obligations and government-sponsored enterprisesObligations of state and political subdivisionsOther securities*
Amortized CostFTE YieldFair ValueAmortized CostFTE YieldFair ValueAmortized CostFTE YieldFair Value
Securities available for sale:(dollars in thousands)
Within 1 year$96,253 2.11 %$95,243 $2,759 3.55 %$2,757 $- - %$- 
After 1 but within 5 years955,361 4.22 %965,500 13,173 4.54 %13,232 1,167 7.49 %1,167 
After 5 but within 10 years- - %- 256 2.74 %252 - - %- 
After 10 years- - %- 407 7.89 %403 - - %- 
Mortgage– and asset-backed securities5,345,130 4.04 %5,288,577 - - %- 5,368 5.07 %5,332 
Total available for sale securities$6,396,744 4.04 %$6,349,320 $16,595 4.43 %$16,644 $6,535 5.58 %$6,499 
Securities held to maturity:
Within 1 year$- - %$- $155 3.36 %$155 $- - %$- 
After 1 but within 5 years- - %- 1,492 2.75 %1,492 - - %- 
After 5 but within 10 years- - %- 31 6.52 %31 - - %- 
After 10 years- - %- - - %- - - %- 
Mortgage– and asset-backed securities21 6.11 %22 - - %- - - %- 
Total held to maturity securities$21 6.11 %$22 $1,678 2.88 %$1,678 $- - %$- 
* Other securities consist primarily of corporate bonds.
Schedule of Unrealized Loss on Available-for-Sale
Gross unrealized losses on AFS investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2025 and 2024 were as follows:
As of December 31, 2025
Less than 12 months12 months or moreTotal
Fair valueUnrealized
losses		Fair valueUnrealized
losses		Fair valueUnrealized
losses
Available for sale securities:(dollars in thousands)
U.S. government obligations and government- sponsored enterprises$419,704 $(1,190)$1,469,113 $(103,318)$1,888,817 $(104,508)
Obligations of states and political subdivisions- - 7,204 (38)7,204 (38)
Other securities- - 3,557 (36)3,557 (36)
Total available for sale securities$419,704 $(1,190)$1,479,874 $(103,392)$1,899,578 $(104,582)
As of December 31, 2024
Less than 12 months12 months or moreTotal
Fair valueUnrealized
losses		Fair valueUnrealized
losses		Fair valueUnrealized
losses
Available for sale securities:(dollars in thousands)
U.S. government obligations and government- sponsored enterprises$1,468,478 $(14,293)$2,757,421 $(183,418)$4,225,899 $(197,711)
Obligations of states and political subdivisions2,239 (16)9,618 (195)11,856 (211)
Other securities717 - 26,691 (671)27,409 (671)
Total available for sale securities$1,471,434 $(14,309)$2,793,730 $(184,284)$4,265,164 $(198,593)
Schedule of Unrealized Loss on Held-to-Maturity
Gross unrealized losses on HTM investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2025 and 2024 were as follows:
As of December 31, 2025
Less than 12 months12 months or moreTotal
Fair valueUnrealized
losses		Fair valueUnrealized
losses		Fair valueUnrealized
losses
Held to maturity securities:(dollars in thousands)
U.S. government obligations and government- sponsored enterprises$- $- $- $- $- $- 
Obligations of states and political subdivisions450 - - - 450 - 
Total held to maturity securities$450 $- $- $- $450 $- 
As of December 31, 2024
Less than 12 months12 months or moreTotal
Fair valueUnrealized
losses		Fair valueUnrealized
losses		Fair valueUnrealized
losses
Held to maturity securities:(dollars in thousands)
U.S. government obligations and government- sponsored enterprises$- $- $- $- $- $- 
Obligations of states and political subdivisions1,278 (15)149 (1)1,427 (16)
Total held to maturity securities$1,278 $(15)$149 $(1)$1,427 $(16)
Schedule of Amortized Cost Basis by Credit Rating of Held to Maturity Investment
The following table shows the amortized cost basis by credit rating (Standard & Poor's and Moody's) of the Company’s HTM obligations of states and political subdivisions at December 31, 2025 and 2024.
December 31, 2025
Amortized Cost Basis by Credit Rating
Non-RatedAAAAAAGrand Total
Held to maturity securities:(dollars in thousands)
State and political subdivisions$251 $- $1,132 $295 $1,678 
December 31, 2024
Amortized Cost Basis by Credit Rating
Non-RatedAAAAAAGrand Total
Held to maturity securities:(dollars in thousands)
State and political subdivisions$35 $40 $2,996 $150 $3,221