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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2026
Investments, Debt and Equity Securities [Abstract]  
Equity Securities without Readily Determinable Fair Value
March 31, 2026December 31, 2025
(dollars in thousands)
Federal Home Loan Bank stock$10,604 $10,634 
Federal Reserve Bank stock26,057 26,057 
Other - no readily determinable fair value11,513 11,510 
Total$48,174 $48,200 
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 March 31, 2026 and December 31, 2025.
As of March 31, 2026
Amortized CostGross
Unrealized
Gain		Gross
Unrealized
Loss		Fair ValueAllowance
for Credit
Losses		Net
Carrying
Amount
(dollars in thousands)
Available for sale:
U.S. Treasury securities$1,096,080 $4,164 $(2,936)$1,097,308 $- $1,097,308 
U.S. agency debentures128,157 16 (505)127,668 - 127,668 
U.S. agency mortgage-backed securities5,594,209 19,838 (118,082)5,495,965 - 5,495,965 
Obligations of states and political subdivisions15,889 55 (52)15,892 - 15,892 
Other securities
4,804 2 (66)4,740 - 4,740 
Total$6,839,139 $24,075 $(121,641)$6,741,573 $- $6,741,573 
Held to maturity:
U.S. agency RMBS
$20 $1 $- $21 $- $21 
Obligations of states and political subdivisions1,518 - - 1,518 (10)1,508 
Total$1,538 $1 $- $1,539 $(10)$1,529 
As of December 31, 2025
Amortized CostGross
Unrealized
Gain		Gross
Unrealized
Loss		Fair ValueAllowance
for Credit
Losses		Net
Carrying
Amount
(dollars in thousands)
Available for sale:
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$6,419,874 $57,171 $(104,582)$6,372,463 $- $6,372,463 
Held to maturity:
U.S. agency RMBS$21 $1 $- $22 $- $22 
Obligations of states and political subdivisions
1,678 - - 1,678 (10)1,668 
Total$1,699 $1 $- $1,700 $(10)$1,690 
Schedule of Fair Value of Available for Sale Securities by Contractual Maturities
The amortized cost and fair value of AFS and HTM securities at March 31, 2026, by contractual maturity, are shown below:
March 31, 2026
U.S. government
obligations and government-
sponsored enterprises		Obligations of states
and political subdivisions		Other securities*
Amortized
cost		FTE
Yield		Fair valueAmortized
cost		FTE
Yield		Fair valueAmortized
cost		FTE
Yield		Fair value
(dollars in thousands)
Available for sale:
Within 1 year$191,070 2.94%$190,109 $4,743 4.65%$4,773 $- -%$- 
After 1 but within 5 years1,033,167 4.20%1,034,866 10,744 4.25%10,721 - -- 
After 5 but within 10 years- -- - -- - -- 
After 10 years- -- 402 7.91%398 - -- 
Mortgage - and asset-backed securities5,594,209 4.02%5,495,966 - -- 4,804 4.77%4,740 
Total$6,818,446 4.01%$6,720,941 $15,889 4.46%$15,892 $4,804 4.77%$4,740 
Held to maturity:
Within 1 year$- -%$- $295 5.04%$295 $- -%$- 
After 1 but within 5 years- -- 1,223 2.28%1,223 - -- 
After 5 but within 10 years- -- - -- - -- 
After 10 years- -- - -- - -- 
Mortgage - and asset-backed securities20 6.11%21 - -- - -- 
Total$20 6.11%$21 $1,518 2.82%$1,518 $- -%$- 
  * Other securities consist primarily of corporate bonds.
Schedule of Unrealized Loss on Available-for-Sale At March 31, 2026 management does not intend to sell the securities, nor is it anticipated that it would be required to sell the securities prior to the anticipated recovery.
As of March 31, 2026
Less than 12 months12 months or moreTotal
Fair valueUnrealized
losses		Fair valueUnrealized
losses		Fair valueUnrealized
losses
(dollars in thousands)
Available for sale:
U.S. government obligations and government- sponsored enterprises$2,083,763 $(15,229)$1,401,353 $(106,293)$3,485,116 $(121,522)
Obligations of states and political subdivisions475 - 6,229 (52)6,704 (52)
Other securities- - 3,421 (66)3,421 (66)
Total$2,084,238 $(15,229)$1,411,003 $(106,411)$3,495,241 $(121,640)
As of December 31, 2025
Less than 12 months12 months or moreTotal
Fair valueUnrealized
Losses		Fair valueUnrealized
losses		Fair valueUnrealized
losses
(dollars in thousands)
Available for sale:
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$419,704 $(1,190)$1,479,874 $(103,392)$1,899,578 $(104,582)
Schedule of Unrealized Loss on Held-to-Maturity
Gross unrealized losses on HTM investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at March 31, 2026 and December 31, 2025 were as follows:
As of March 31, 2026
Less than 12 months12 months or moreTotal
Fair valueUnrealized
losses		Fair valueUnrealized
losses		Fair valueUnrealized
losses
(dollars in thousands)
Held to maturity:
U.S. government obligations and government- sponsored enterprises$- $- $- $- $- $- 
Obligations of states and political subdivisions515 - - - 515 - 
Total$515 $- $- $- $515 $- 
As of December 31, 2025
Less than 12 months12 months or moreTotal
Fair valueUnrealized
losses		Fair valueUnrealized
losses		Fair valueUnrealized
losses
(dollars in thousands)
Held to maturity:
U.S. government obligations and government- sponsored enterprises$- $- $- $- $- $- 
Obligations of states and political subdivisions450 - - - 450 - 
Total$450 $- $- $- $450 $- 
Schedule of Amortized Cost Basis by Credit Rating of Held to Maturity Investment
The following table shows the amortized cost basis by credit rating of the Company's HTM obligations of states and political subdivisions at March 31, 2026 and December 31, 2025.
March 31, 2026
Amortized Cost Basis by Credit Rating - HTM Debt Securities
Non-RatedAAAAAATotal
Held to maturity securities:(dollars in thousands)
State and political subdivisions$246 $- $977 $295 $1,518 
December 31, 2025
Amortized Cost Basis by Credit Rating - HTM Debt Securities
Non-RatedAAAAAATotal
Held to maturity securities:(dollars in thousands)
State and political subdivisions$251 $- $1,132 $295 $1,678