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Debt Securities (Tables)
 6 Months Ended
Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Amortized cost, gross unrealized gains and losses and 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:
 June 30, 2022
(Dollars in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Available-for-sale
U.S. government and federal agency$489,798 93 (32,007)457,884 
U.S. government sponsored enterprises319,509 — (21,695)297,814 
State and local governments440,473 2,794 (5,650)437,617 
Corporate bonds101,153 677 (482)101,348 
Residential mortgage-backed securities4,025,432 187 (310,117)3,715,502 
Commercial mortgage-backed securities1,260,468 922 (62,356)1,199,034 
Total available-for-sale$6,636,833 4,673 (432,307)6,209,199 
Held-to-maturity
U.S. government and federal agency844,175 — (56,566)787,609 
State and local governments1,653,376 990 (215,836)1,438,530 
Residential mortgage-backed securities1,290,935 — (57,315)1,233,620 
Total held-to-maturity3,788,486 990 (329,717)3,459,759 
Total debt securities10,425,319 5,663 (762,024)9,668,958 
 December 31, 2021
(Dollars in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
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-sale$9,175,423 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 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 June 30, 2022. Actual maturities may differ from expected or contractual maturities since some issuers have the right to prepay obligations with or without prepayment penalties.
 June 30, 2022
 Available-for-SaleHeld-to-Maturity
(Dollars in thousands)Amortized CostFair ValueAmortized CostFair Value
Due within one year$51,941 52,177 1,424 1,430 
Due after one year through five years926,147 873,802 521,133 491,108 
Due after five years through ten years165,413 164,726 528,160 496,150 
Due after ten years207,432 203,958 1,446,834 1,237,451 
1,350,933 1,294,663 2,497,551 2,226,139 
Mortgage-backed securities 1
5,285,900 4,914,536 1,290,935 1,233,620 
Total$6,636,833 6,209,199 3,788,486 3,459,759 
______________________________
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 the 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:
 Three Months endedSix Months ended
(Dollars in thousands)June 30,
2022		June 30,
2021		June 30,
2022		June 30,
2021
Available-for-sale
Proceeds from sales and calls of debt securities$18,146 22,361 71,266 76,697 
Gross realized gains 1
87 69 780 438 
Gross realized losses 1
— (23)(15)(66)
Held-to-maturity
Proceeds from calls of debt securities9,370 2,230 22,345 6,360 
Gross realized gains 1
14 — 29 — 
Gross realized losses 1
(361)(107)(608)(149)
______________________________
1 The gain or loss on the sale or call of each debt security is determined by the specific identification method.
AFS debt securities in an unrealized loss position with no ACL recorded
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.
 June 30, 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
46 $447,250 (31,667)4,071 (340)451,321 (32,007)
U.S. government sponsored enterprises
15 297,813 (21,695)— — 297,813 (21,695)
State and local governments193 217,517 (5,437)1,579 (213)219,096 (5,650)
Corporate bonds11 35,458 (482)— — 35,458 (482)
Residential mortgage-backed securities
417 2,952,869 (245,705)747,910 (64,412)3,700,779 (310,117)
Commercial mortgage-backed securities
141 982,059 (49,329)127,213 (13,027)1,109,272 (62,356)
Total available-for-sale
823 $4,932,966 (354,315)880,773 (77,992)5,813,739 (432,307)
 
 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 securities
151 5,335,632 (53,434)53,045 (832)5,388,677 (54,266)
Commercial mortgage-backed securities
38 302,784 (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 The following table summarizes the amortized cost of held-to-maturity municipal bonds aggregated by NRSRO credit rating:
(Dollars in thousands)June 30,
2022		December 31,
2021
Municipal bonds held-to-maturity
S&P: AAA / Moody’s: Aaa
$396,350 316,899 
S&P: AA+, AA, AA- / Moody’s: Aa1, Aa2, Aa3
1,217,650 841,616 
S&P: A+, A, A- / Moody’s: A1, A2, A3
36,960 39,078 
Not rated by either entity
2,416 1,571 
Total municipal bonds held-to-maturity
$1,653,376 1,199,164