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Debt Securities (Tables)
 9 Months Ended
Sep. 30, 2021
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:
 September 30, 2021
(Dollars in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Available-for-sale
U.S. government and federal agency$31,449 207 (283)31,373 
U.S. government sponsored enterprises47,324 6 (279)47,051 
State and local governments479,116 29,666 (91)508,691 
Corporate bonds191,164 6,958 (3)198,119 
Residential mortgage-backed securities5,498,676 13,982 (21,313)5,491,345 
Commercial mortgage-backed securities1,081,008 36,640 (3,647)1,114,001 
Total available-for-sale$7,328,737 87,459 (25,616)7,390,580 
Held-to-maturity
State and local governments$1,128,299 20,131 (1,977)1,146,453 
Total held-to-maturity$1,128,299 20,131 (1,977)1,146,453 
 December 31, 2020
(Dollars in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Available-for-sale
U.S. government and federal agency$38,568 287 (267)38,588 
U.S. government sponsored enterprises9,747 34 — 9,781 
State and local governments1,321,763 94,974 (54)1,416,683 
Corporate bonds336,867 12,239 (8)349,098 
Residential mortgage-backed securities2,261,463 27,631 (4)2,289,090 
Commercial mortgage-backed securities1,177,458 57,575 (459)1,234,574 
Total available-for-sale$5,145,866 192,740 (792)5,337,814 
Held-to-maturity
State and local governments$189,836 13,380 — 203,216 
Total held-to-maturity$189,836 13,380 — 203,216 
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 September 30, 2021. Actual maturities may differ from expected or contractual maturities since some issuers have the right to prepay obligations with or without prepayment penalties.
 September 30, 2021
 Available-for-SaleHeld-to-Maturity
(Dollars in thousands)Amortized CostFair ValueAmortized CostFair Value
Due within one year$68,088 68,877 1,529 1,544 
Due after one year through five years186,292 195,336 27,382 29,114 
Due after five years through ten years250,903 259,085 89,010 94,026 
Due after ten years243,770 261,936 1,010,378 1,021,769 
749,053 785,234 1,128,299 1,146,453 
Mortgage-backed securities 1
6,579,684 6,605,346 — — 
Total$7,328,737 7,390,580 1,128,299 1,146,453 
______________________________
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 endedNine Months ended
(Dollars in thousands)September 30,
2021		September 30,
2020		September 30,
2021		September 30,
2020
Available-for-sale
Proceeds from sales and calls of debt securities$74,328 69,304 151,025 184,088 
Gross realized gains 1
507 102 945 1,206 
Gross realized losses 1
(9)(78)(75)(192)
Held-to-maturity
Proceeds from calls of debt securities19,120 9,280 25,480 29,530 
Gross realized gains 1
— — — 1 
Gross realized losses 1
(666)— (815)— 
______________________________
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.
 September 30, 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
23 $9,736 (78)5,398 (205)15,134 (283)
U.S. government sponsored enterprises
3 45,279 (279)— — 45,279 (279)
State and local governments11 15,596 (30)1,742 (61)17,338 (91)
Corporate bonds1 5,016 (3)— — 5,016 (3)
Residential mortgage-backed securities
115 3,730,195 (21,312)26 (1)3,730,221 (21,313)
Commercial mortgage-backed securities
21 79,332 (866)114,338 (2,781)193,670 (3,647)
Total available-for-sale
174 $3,885,154 (22,568)121,504 (3,048)4,006,658 (25,616)
Held-to-maturity
State and local governments126 $317,479 (1,977)— — 317,479 (1,977)
Total held-to-maturity126 $317,479 (1,977)— — 317,479 (1,977)
 
 December 31, 2020
 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
18 $13,814 (258)726 (9)14,540 (267)
State and local governments6 3,121 (54)— — 3,121 (54)
Corporate bonds3 5,500 (8)— — 5,500 (8)
Residential mortgage-backed securities
14 2,354 (4)27 — 2,381 (4)
Commercial mortgage-backed securities
5 120,741 (459)— — 120,741 (459)
Total available-for-sale
46 $145,530 (783)753 (9)146,283 (792)
Credit quality indictors for HTM debt securities The following table summarizes the amortized cost of held-to-maturity debt securities aggregated by NRSRO credit rating:
(Dollars in thousands)September 30,
2021		December 31,
2020
Held-to-maturity
S&P: AAA / Moody’s: Aaa
$274,791 39,022 
S&P: AA+, AA, AA- / Moody’s: Aa1, Aa2, Aa3
812,759 123,664 
S&P: A+, A, A- / Moody’s: A1, A2, A3
38,739 27,150 
S&P: BBB+, BBB, BBB- / Moody’s: Baa1, Baa2, Baa3— — 
Not rated by either entity
2,010 — 
Below investment grade
— — 
Total held-to-maturity
$1,128,299 189,836