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Debt Securities (Tables)
 12 Months Ended
Dec. 31, 2022
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, 2022
 Amortized
Cost		Gross Unrealized GainsGross Unrealized LossesFair
Value
(Dollars in thousands)
Available-for-sale
U.S. government and federal agency$487,320 23 (42,616)444,727 
U.S. government sponsored enterprises320,157 — (32,793)287,364 
State and local governments137,033 709 (4,749)132,993 
Corporate bonds27,101 — (992)26,109 
Residential mortgage-backed securities3,706,427 6 (439,092)3,267,341 
Commercial mortgage-backed securities1,252,065 347 (103,639)1,148,773 
Total available-for-sale5,930,103 1,085 (623,881)5,307,307 
Held-to-maturity
U.S. government and federal agency846,046 — (83,796)762,250 
State and local governments1,682,640 1,045 (248,233)1,435,452 
Residential mortgage-backed securities1,186,366 — (109,276)1,077,090 
Total held-to-maturity3,715,052 1,045 (441,305)3,274,792 
Total debt securities$9,645,155 2,130 (1,065,186)8,582,099 

 December 31, 2021
 Amortized
Cost		Gross Unrealized GainsGross Unrealized LossesFair
Value
(Dollars in thousands)
Available-for-sale
U.S. government and federal agency$1,356,171 174 (9,596)1,346,749 
U.S. government sponsored enterprises241,687 2 (996)240,693 
State and local governments461,414 27,567 (123)488,858 
Corporate bonds175,697 5,072 (17)180,752 
Residential mortgage-backed securities5,744,505 9,420 (54,266)5,699,659 
Commercial mortgage-backed securities1,195,949 25,882 (7,693)1,214,138 
Total available-for-sale9,175,423 68,117 (72,691)9,170,849 
Held-to-maturity
State and local governments1,199,164 22,878 (1,159)1,220,883 
Total held-to-maturity1,199,164 22,878 (1,159)1,220,883 
Total debt securities$10,374,587 90,995 (73,850)10,391,732 
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, 2022. 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, 2022
 Available-for-SaleHeld-to-Maturity
(Dollars in thousands)Amortized CostFair ValueAmortized CostFair Value
Due within one year$2,211 2,193 2,845 2,836 
Due after one year through five years854,342 778,697 658,446 600,431 
Due after five years through ten years55,039 53,075 409,209 371,607 
Due after ten years60,019 57,228 1,458,186 1,222,828 
971,611 891,193 2,528,686 2,197,702 
Mortgage-backed securities 1
4,958,492 4,416,114 1,186,366 1,077,090 
Total$5,930,103 5,307,307 3,715,052 3,274,792 
______________________________
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 are listed below:
 Years ended
(Dollars in thousands)December 31,
2022		December 31,
2021		December 31,
2020
Available-for-sale
Proceeds from sales and calls of debt securities$428,225 188,431 240,521 
Gross realized gains 1
3,357 984 1,400 
Gross realized losses 1
(2,021)(194)(262)
Held-to-maturity
Proceeds from calls of debt securities28,210 48,475 32,735 
Gross realized gains 1
64 3 1 
Gross realized losses 1
(780)(1,431)— 
______________________________
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, 2022
 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
56 $4,150 (64)435,375 (42,552)439,525 (42,616)
U.S. government sponsored enterprises
14 — — 287,364 (32,793)287,364 (32,793)
State and local governments121 71,512 (2,109)20,753 (2,640)92,265 (4,749)
Corporate bonds5 25,146 (992)— — 25,146 (992)
Residential mortgage-backed securities441 301,548 (24,581)2,965,512 (414,511)3,267,060 (439,092)
Commercial mortgage-backed securities157 673,102 (41,984)435,176 (61,655)1,108,278 (103,639)
Total available-for-sale
794 $1,075,458 (69,730)4,144,180 (554,151)5,219,638 (623,881)

 December 31, 2021
 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
50 $1,329,399 (9,344)5,457 (252)1,334,856 (9,596)
U.S. government sponsored enterprises
11 239,928 (996)— — 239,928 (996)
State and local governments10 11,080 (83)1,760 (40)12,840 (123)
Corporate bonds3 12,483 (17)— — 12,483 (17)
Residential mortgage-backed securities151 5,335,632 (53,434)53,045 (832)5,388,677 (54,266)
Commercial mortgage-backed securities38 302,784 (3,316)126,798 (4,377)429,582 (7,693)
Total available-for-sale
263 $7,231,306 (67,190)187,060 (5,501)7,418,366 (72,691)
Credit quality indictors for HTM debt securities
Allowance for Credit Losses - Held-To-Maturity Debt Securities
The Company measured expected credit losses on held-to-maturity debt securities on a collective basis by major security type and NRSRO credit ratings, which is the Company’s primary credit quality indicator for state and local government securities. The estimate of expected credit losses considered historical credit loss information that was adjusted for current conditions as well as reasonable and supportable forecasts. The following table summarizes the amortized cost of held-to-maturity municipal bonds aggregated by NRSRO credit rating:
(Dollars in thousands)December 31,
2022		December 31,
2021
Municipal bonds held-to-maturity
S&P: AAA / Moody’s: Aaa
$430,542 316,899 
S&P: AA+, AA, AA- / Moody’s: Aa1, Aa2, Aa3
1,206,441 841,616 
S&P: A+, A, A- / Moody’s: A1, A2, A3
37,162 39,078 
Not rated by either entity
8,495 1,571 
Total municipal bonds held-to-maturity
$1,682,640 1,199,164