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Debt Securities (Tables)
 9 Months Ended
Sep. 30, 2020
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, 2020
(Dollars in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Available-for-sale
U.S. government and federal agency$40,082 297 (239)40,140 
U.S. government sponsored enterprises9,767 58 — 9,825 
State and local governments1,192,905 82,509 (38)1,275,376 
Corporate bonds347,400 13,647 (23)361,024 
Residential mortgage-backed securities1,255,016 21,551 (709)1,275,858 
Commercial mortgage-backed securities1,104,252 59,075 (2)1,163,325 
Total available-for-sale$3,949,422 177,137 (1,011)4,125,548 
Held-to-maturity
State and local governments$193,509 13,068 — 206,577 
Total held-to-maturity$193,509 13,068 — 206,577 

 December 31, 2019
(Dollars in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Available-for-sale
U.S. government and federal agency$20,061 48 (65)20,044 
U.S. government sponsored enterprises42,724 953 — 43,677 
State and local governments679,784 22,694 (80)702,398 
Corporate bonds155,665 1,938 (1)157,602 
Residential mortgage-backed securities731,766 7,507 (549)738,724 
Commercial mortgage-backed securities891,374 22,825 (1,392)912,807 
Total available-for-sale$2,521,374 55,965 (2,087)2,575,252 
Held-to-maturity
State and local governments$224,611 9,785 — 234,396 
Total held-to-maturity$224,611 9,785 — 234,396 
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, 2020. 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, 2020
 Available-for-SaleHeld-to-Maturity
(Dollars in thousands)Amortized CostFair ValueAmortized CostFair Value
Due within one year$119,874 121,303 — — 
Due after one year through five years264,927 277,758 19,543 20,996 
Due after five years through ten years263,208 277,022 69,924 75,680 
Due after ten years942,145 1,010,282 104,042 109,901 
1,590,154 1,686,365 193,509 206,577 
Mortgage-backed securities 1
2,359,268 2,439,183 — — 
Total$3,949,422 4,125,548 193,509 206,577 
______________________________
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,
2020		September 30,
2019		September 30,
2020		September 30,
2019
Available-for-sale
Proceeds from sales and calls of debt securities$69,304 401,701 184,088 878,072 
Gross realized gains 1
102 14,329 1,206 18,613 
Gross realized losses 1
(78)(518)(192)(4,447)
Held-to-maturity
Proceeds from calls of debt securities9,280 16,365 29,530 48,940 
Gross realized gains 1
— — 1 2 
Gross realized losses 1
— — — (10)
______________________________
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, 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
19 $13,656 (230)663 (9)14,319 (239)
State and local governments11 5,383 (38)— — 5,383 (38)
Corporate bonds6 11,029 (23)— — 11,029 (23)
Residential mortgage-backed securities
28 282,912 (709)27 — 282,939 (709)
Commercial mortgage-backed securities
1 11,035 (2)— — 11,035 (2)
Total available-for-sale
65 $324,015 (1,002)690 (9)324,705 (1,011)
 
 December 31, 2019
 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
20 $464 — 9,902 (65)10,366 (65)
State and local governments12 19,044 (80)— — 19,044 (80)
Corporate bonds2 7,378 (1)— — 7,378 (1)
Residential mortgage-backed securities
35 85,562 (234)29,038 (315)114,600 (549)
Commercial mortgage-backed securities
19 177,051 (1,293)7,697 (99)184,748 (1,392)
Total available-for-sale
88 $289,499 (1,608)46,637 (479)336,136 (2,087)
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,
2020		December 31,
2019
Held-to-maturity
S&P: AAA / Moody’s: Aaa
$40,735 65,217 
S&P: AA+, AA, AA- / Moody’s: Aa1, Aa2, Aa3
125,573 130,316 
S&P: A+, A, A- / Moody’s: A1, A2, A3
27,201 28,689 
Not rated by either entity
— 389 
Total held-to-maturity
$193,509 224,611