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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]    
Schedule of Available-for-Sale Securities Reconciliation
Below is an analysis of the amortized cost and fair values of securities available for sale at December 31:
 20252024
 Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value		Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value
 (dollars in thousands)
Obligations of U.S. Government Agencies:
Mortgage-Backed Securities – Residential$2,638 $23 $(165)$2,496 $3,096 $14 $(212)$2,898 
Mortgage-Backed Securities – Commercial701,572 3,788 (43,671)661,689 779,232 2,489 (57,546)724,175 
Obligations of U.S. Government-Sponsored Enterprises:
Mortgage-Backed Securities – Residential336,493 1,087 (42,057)295,523 413,434 1,481 (64,331)350,584 
Other Government-Sponsored Enterprises1,000 — (16)984 1,000 — (54)946 
Obligations of States and Political Subdivisions7,560 1 (590)6,971 8,510 — (983)7,527 
Corporate Securities46,969 782 (1,220)46,531 62,475 1,454 (2,436)61,493 
Total Securities Available for Sale$1,096,232 $5,681 $(87,719)$1,014,194 $1,267,747 $5,438 $(125,562)$1,147,623 
  
Debt Securities, Available-for-Sale
The amortized cost and estimated fair value of debt securities available for sale at December 31, 2025, by contractual maturity, are shown below:
Amortized
Cost		Estimated
Fair Value
 (dollars in thousands)
Due within 1 year$1,000 $984 
Due after 1 but within 5 years35,035 34,797 
Due after 5 but within 10 years19,494 18,705 
Due after 10 years— — 
55,529 54,486 
Mortgage-Backed Securities (a)1,040,703 959,708 
Total Debt Securities$1,096,232 $1,014,194 
(a)Mortgage-Backed Securities include an amortized cost of $704.2 million and a fair value of $664.2 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $336.5 million and a fair value of $295.5 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.
  
Proceeds from Sale, Gross Gains (Losses) Realized on Sales, Maturities and Other-Than-Temporary Impairment Charges Related to Securities Available for Sale Mortgage-Backed Securities include an amortized cost of $704.2 million and a fair value of $664.2 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $336.5 million and a fair value of $295.5 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.  
Held-to-maturity Securities
Below is an analysis of the amortized cost and fair values of debt securities held to maturity at December 31:
 20252024
 Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value		Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value
 (dollars in thousands)
Obligations of U.S. Government Agencies:
Mortgage-Backed Securities – Residential$1,379 $— $(144)$1,235 $1,586 $— $(220)$1,366 
Mortgage-Backed Securities – Commercial163,625 606 (12,320)151,911 89,404 66 (14,785)74,685 
Obligations of U.S. Government-Sponsored Enterprises:
Mortgage-Backed Securities – Residential307,676 485 (33,395)274,766 266,587 — (47,564)219,023 
Mortgage-Backed Securities – Commercial— — — — — — — — 
Other Government-Sponsored Enterprises23,199 — (2,735)20,464 22,869 — (4,155)18,714 
Obligations of States and Political Subdivisions22,743 — (1,250)21,493 24,193 — (2,246)21,947 
Debt Securities Issued by Foreign Governments800 — (4)796 1,000 — (16)984 
Total Securities Held to Maturity$519,422 $1,091 $(49,848)$470,665 $405,639 $66 $(68,986)$336,719 
  
Investments Classified by Contractual Maturity Date [1]
The amortized cost and estimated fair value of debt securities held to maturity at December 31, 2025, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or repay obligations with or without call or prepayment penalties.
Amortized
Cost		Estimated
Fair Value
 (dollars in thousands)
Due within 1 year$1,804 $1,793 
Due after 1 but within 5 years16,845 16,126 
Due after 5 but within 10 years27,529 24,363 
Due after 10 years564 471 
46,742 42,753 
Mortgage-Backed Securities (a)472,680 427,912 
Total Debt Securities$519,422 $470,665 
(a)Mortgage-Backed Securities include an amortized cost of $165.0 million and a fair value of $153.1 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $307.7 million and a fair value of $274.8 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.
  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments
The following table presents the gross unrealized losses and estimated fair values at December 31, 2025 for available for sale securities for which an allowance for credit losses has not been recorded and held to maturity securities by investment category and time frame for which the securities have been in a continuous unrealized loss position:
 Less Than 12 Months12 Months or MoreTotal
 Estimated
Fair Value		Gross
Unrealized
Losses		Estimated
Fair Value		Gross
Unrealized
Losses		Estimated
Fair Value		Gross
Unrealized
Losses
 (dollars in thousands)
Obligations of U.S. Government Agencies:
Mortgage-Backed Securities – Residential$— $— $2,789 $(309)$2,789 $(309)
Mortgage-Backed Securities – Commercial77,195 (509)270,142 (55,482)347,337 (55,991)
Obligations of U.S. Government-Sponsored Enterprises:
Mortgage-Backed Securities – Residential19,924 (95)438,740 (75,357)458,664 (75,452)
Mortgage-Backed Securities – Commercial— — — — — — 
Other Government-Sponsored Enterprises— — 21,448 (2,751)21,448 (2,751)
Obligations of States and Political Subdivisions— — 26,563 (1,840)26,563 (1,840)
Debt Securities Issued by Foreign Governments— — 596 (4)596 (4)
Corporate Securities5,492 (3)22,845 (1,217)28,337 (1,220)
Total Securities$102,611 $(607)$783,123 $(136,960)$885,734 $(137,567)
The following table presents the gross unrealized losses and estimated fair value at December 31, 2024 for both available for sale and held to maturity securities by investment category and time frame for which the securities had been in a continuous unrealized loss position: 
 Less Than 12 Months12 Months or MoreTotal
 Estimated
Fair Value		Gross
Unrealized
Losses		Estimated
Fair Value		Gross
Unrealized
Losses		Estimated
Fair Value		Gross
Unrealized
Losses
 (dollars in thousands)
Obligations of U.S. Government Agencies:
Mortgage-Backed Securities – Residential$242 $(1)$3,002 $(431)$3,244 $(432)
Mortgage-Backed Securities – Commercial258,712 (4,119)274,358 (68,212)533,070 (72,331)
Obligations of U.S. Government-Sponsored Enterprises:
Mortgage-Backed Securities – Residential4,759 (56)497,445 (111,839)502,204 (111,895)
Mortgage-Backed Securities – Commercial— — — — — — 
Other Government-Sponsored Enterprises— — 19,660 (4,209)19,660 (4,209)
Obligations of States and Political Subdivisions1,104 (11)28,097 (3,218)29,201 (3,229)
Debt Securities Issued by Foreign Governments— — 584 (16)584 (16)
Corporate Securities9,701 (506)17,321 (1,930)27,022 (2,436)
Total Securities$274,518 $(4,693)$840,467 $(189,855)$1,114,985 $(194,548)
Marketable Securities
 
[1] Mortgage-Backed Securities include an amortized cost of $165.0 million and a fair value of $153.1 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $307.7 million and a fair value of $274.8 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.