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Debt Securities (Tables)
 12 Months Ended
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
Amortized cost, gross unrealized gains and losses and the fair value of debt securities
The following tables present the amortized cost, the gross unrealized gains and losses and the fair value of the Company’s debt securities:
 December 31, 2024
 Amortized
Cost		Gross Unrealized GainsGross Unrealized LossesFair
Value
(Dollars in thousands)
Available-for-sale
U.S. government and federal agency$484,082 5 (15,654)468,433 
U.S. government sponsored enterprises323,854 — (13,700)310,154 
State and local governments71,737 215 (3,272)68,680 
Corporate bonds14,818 — (315)14,503 
Residential mortgage-backed securities2,660,330 5 (304,819)2,355,516 
Commercial mortgage-backed securities1,101,489 2 (73,572)1,027,919 
Total available-for-sale4,656,310 227 (411,332)4,245,205 
Held-to-maturity
U.S. government and federal agency859,432 — (54,496)804,936 
State and local governments1,619,850 810 (209,502)1,411,158 
Residential mortgage-backed securities815,565 — (63,089)752,476 
Total held-to-maturity3,294,847 810 (327,087)2,968,570 
Total debt securities$7,951,157 1,037 (738,419)7,213,775 

 December 31, 2023
 Amortized
Cost		Gross Unrealized GainsGross Unrealized LossesFair
Value
(Dollars in thousands)
Available-for-sale
U.S. government and federal agency$485,005 11 (29,669)455,347 
U.S. government sponsored enterprises321,993 — (22,774)299,219 
State and local governments101,903 302 (3,273)98,932 
Corporate bonds27,007 2 (756)26,253 
Residential mortgage-backed securities3,166,589 7 (355,333)2,811,263 
Commercial mortgage-backed securities1,180,756 519 (86,570)1,094,705 
Total available-for-sale5,283,253 841 (498,375)4,785,719 
Held-to-maturity
U.S. government and federal agency853,273 — (65,472)787,801 
State and local governments1,650,000 2,843 (181,192)1,471,651 
Residential mortgage-backed securities999,138 — (78,396)920,742 
Total held-to-maturity3,502,411 2,843 (325,060)3,180,194 
Total debt securities$8,785,664 3,684 (823,435)7,965,913 
Amortized cost and fair value of debt securities by contractual maturity
The following table presents the amortized cost and fair value of available-for-sale and held-to-maturity debt securities by contractual maturity at December 31, 2024. Actual maturities may differ from expected or contractual maturities since some issuers have the right to prepay obligations with or without prepayment penalties.
 December 31, 2024
 Available-for-SaleHeld-to-Maturity
(Dollars in thousands)Amortized CostFair ValueAmortized CostFair Value
Due within one year$321,716 313,311 9,584 9,566 
Due after one year through five years519,869 498,840 941,501 885,563 
Due after five years through ten years21,731 20,189 209,288 198,057 
Due after ten years31,175 29,430 1,318,909 1,122,908 
894,491 861,770 2,479,282 2,216,094 
Mortgage-backed securities 1
3,761,819 3,383,435 815,565 752,476 
Total$4,656,310 4,245,205 3,294,847 2,968,570 
______________________________
1 Mortgage-backed securities, which have prepayment provisions, are not assigned to maturity categories due to fluctuations in their prepayment speeds.
Proceeds from sales and calls of debt securities and associated gains and losses
Proceeds from sales and calls of debt securities and the associated gains and losses that have been included in earnings in gain (loss) on sale of securities are listed below:
 Years ended
(Dollars in thousands)December 31,
2024		December 31,
2023		December 31,
2022
Available-for-sale
Proceeds from sales and calls of debt securities$251,295 31,944 428,225 
Gross realized gains 1
782 145 3,357 
Gross realized losses 1
(725)(176)(2,021)
Held-to-maturity
Proceeds from calls of debt securities14,295 18,125 28,210 
Gross realized gains 1
— 10 64 
Gross realized losses 1
(27)(193)(780)
______________________________
1 The gain or loss on the sale or call of each debt security is determined by the specific identification method.
Summary of debt securities with an unrealized loss position
The following table summarizes available-for-sale debt securities that were in an unrealized loss position for which an ACL has not been recorded, based on the length of time the individual securities have been in an unrealized loss position. The number of available-for-sale debt securities in an unrealized position is also disclosed.
 
 December 31, 2024
 Number
of
Securities		Less than 12 Months12 Months or MoreTotal
(Dollars in thousands)Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss
Available-for-sale
U.S. government and federal agency
55 $3,756 (34)463,151 (15,620)466,907 (15,654)
U.S. government sponsored enterprises
14 — — 310,154 (13,700)310,154 (13,700)
State and local governments50 3,653 (35)49,748 (3,237)53,401 (3,272)
Corporate bonds2 — — 13,707 (315)13,707 (315)
Residential mortgage-backed securities389 13,535 (240)2,341,700 (304,579)2,355,235 (304,819)
Commercial mortgage-backed securities152 36,466 (1,042)986,809 (72,530)1,023,275 (73,572)
Total available-for-sale
662 $57,410 (1,351)4,165,269 (409,981)4,222,679 (411,332)

 December 31, 2023
 Number
of
Securities		Less than 12 Months12 Months or MoreTotal
(Dollars in thousands)Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss
Available-for-sale
U.S. government and federal agency
57 $3,702 (56)448,909 (29,613)452,611 (29,669)
U.S. government sponsored enterprises
14 — — 299,220 (22,774)299,220 (22,774)
State and local governments85 3,039 (2)64,645 (3,271)67,684 (3,273)
Corporate bonds4 — — 23,262 (756)23,262 (756)
Residential mortgage-backed securities402 1,430 (44)2,809,482 (355,289)2,810,912 (355,333)
Commercial mortgage-backed securities151 21,232 (268)1,034,183 (86,302)1,055,415 (86,570)
Total available-for-sale
713 $29,403 (370)4,679,701 (498,005)4,709,104 (498,375)
Credit quality indictors for HTM debt securities The following table summarizes the amortized cost of held-to-maturity municipal bonds aggregated by NRSRO credit rating:
(Dollars in thousands)December 31,
2024		December 31,
2023
Municipal bonds held-to-maturity
S&P: AAA / Moody’s: Aaa
$414,147 427,918 
S&P: AA+, AA, AA- / Moody’s: Aa1, Aa2, Aa3
1,168,491 1,182,894 
S&P: A+, A, A- / Moody’s: A1, A2, A3
33,585 37,742 
Not rated by either entity
3,627 1,446 
Total municipal bonds held-to-maturity
$1,619,850 1,650,000