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Debt Securities (Tables) | 3 Months Ended
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Mar. 31, 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:
| March 31, 2021
(Dollars in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-sale |  |  |  |  |  |  |
U.S. government and federal agency | $ | 36,122 |  |  | 231 |  |  | (490) |  |  | 35,863 |
U.S. government sponsored enterprises | 5,231 |  |  | 22 |  |  | — |  |  | 5,253 |
State and local governments | 914,572 |  |  | 64,593 |  |  | (513) |  |  | 978,652 |
Corporate bonds | 278,914 |  |  | 9,952 |  |  | (85) |  |  | 288,781 |
Residential mortgage-backed securities | 3,369,683 |  |  | 16,420 |  |  | (22,476) |  |  | 3,363,627 |
Commercial mortgage-backed securities | 1,145,668 |  |  | 39,958 |  |  | (4,487) |  |  | 1,181,139 |
Total available-for-sale | $ | 5,750,190 |  |  | 131,176 |  |  | (28,051) |  |  | 5,853,315 |
Held-to-maturity |  |  |  |  |  |  |
State and local governments | $ | 588,751 |  |  | 10,937 |  |  | (728) |  |  | 598,960 |
Total held-to-maturity | $ | 588,751 |  |  | 10,937 |  |  | (728) |  |  | 598,960 |
| 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 enterprises | 9,747 |  |  | 34 |  |  | — |  |  | 9,781 |
State and local governments | 1,321,763 |  |  | 94,974 |  |  | (54) |  |  | 1,416,683 |
Corporate bonds | 336,867 |  |  | 12,239 |  |  | (8) |  |  | 349,098 |
Residential mortgage-backed securities | 2,261,463 |  |  | 27,631 |  |  | (4) |  |  | 2,289,090 |
Commercial mortgage-backed securities | 1,177,458 |  |  | 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 March 31, 2021. Actual maturities may differ from expected or contractual maturities since some issuers have the right to prepay obligations with or without prepayment penalties.
| March 31, 2021
| Available-for-Sale |  | Held-to-Maturity
(Dollars in thousands) | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Due within one year | $ | 91,067 |  |  | 92,128 |  |  | 482 |  |  | 486 |
Due after one year through five years | 237,676 |  |  | 248,388 |  |  | 23,431 |  |  | 24,883 |
Due after five years through ten years | 247,854 |  |  | 257,032 |  |  | 66,883 |  |  | 71,375 |
Due after ten years | 658,242 |  |  | 711,001 |  |  | 497,955 |  |  | 502,216 |
| 1,234,839 |  |  | 1,308,549 |  |  | 588,751 |  |  | 598,960 |
Mortgage-backed securities 1 | 4,515,351 |  |  | 4,544,766 |  |  | — |  |  | — |
Total | $ | 5,750,190 |  |  | 5,853,315 |  |  | 588,751 |  |  | 598,960 |
______________________________ 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 ended
(Dollars in thousands) |  |  |  |  | March 31, 2021 |  | March 31, 2020
Available-for-sale |  |  |  |  |  |  |
Proceeds from sales and calls of debt securities |  |  |  |  | 54,336 |  |  | 77,073 |
Gross realized gains 1 |  |  |  |  | 369 |  |  | 962 |
Gross realized losses 1 |  |  |  |  | (43) |  |  | (100) |
Held-to-maturity |  |  |  |  |  |  |
Proceeds from calls of debt securities |  |  |  |  | 4,130 |  |  | 20,250 |
Gross realized gains 1 |  |  |  |  | — |  |  | 1 |
Gross realized losses 1 |  |  |  |  | (42) |  |  | — |
______________________________ 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.
| March 31, 2021
| Number of Securities |  | Less than 12 Months |  | 12 Months or More |  | Total
(Dollars in thousands) |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government and federal agency | 24 |  |  | $ | 17,857 |  |  | (343) |  |  | 2,361 |  |  | (147) |  |  | 20,218 |  |  | (490) |
State and local governments | 57 |  |  | 36,748 |  |  | (480) |  |  | 816 |  |  | (33) |  |  | 37,564 |  |  | (513) |
Corporate bonds | 1 |  |  | 3,915 |  |  | (85) |  |  | — |  |  | — |  |  | 3,915 |  |  | (85) |
Residential mortgage-backed securities | 80 |  |  | 2,158,485 |  |  | (22,475) |  |  | 27 |  |  | (1) |  |  | 2,158,512 |  |  | (22,476) |
Commercial mortgage-backed securities | 13 |  |  | 237,514 |  |  | (4,487) |  |  | — |  |  | — |  |  | 237,514 |  |  | (4,487) |
Total available-for-sale | 175 |  |  | $ | 2,454,519 |  |  | (27,870) |  |  | 3,204 |  |  | (181) |  |  | 2,457,723 |  |  | (28,051) |
Held-to-maturity |  |  |  |  |  |  |  |  |  |  |  |  |
State and local governments | 65 |  |  | $ | 217,131 |  |  | (728) |  |  | — |  |  | — |  |  | 217,131 |  |  | (728) |
Total held-to-maturity | 65 |  |  | $ | 217,131 |  |  | (728) |  |  | — |  |  | — |  |  | 217,131 |  |  | (728) |
| December 31, 2020
| Number of Securities |  | Less than 12 Months |  | 12 Months or More |  | Total
(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 governments | 6 |  |  | 3,121 |  |  | (54) |  |  | — |  |  | — |  |  | 3,121 |  |  | (54) |
Corporate bonds | 3 |  |  | 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) | March 31, 2021 |  | December 31, 2020
Held-to-maturity |  |  |
S&P: AAA / Moody’s: Aaa | $ | 91,831 |  |  | 39,022 |
S&P: AA+, AA, AA- / Moody’s: Aa1, Aa2, Aa3 | 471,159 |  |  | 123,664 |
S&P: A+, A, A- / Moody’s: A1, A2, A3 | 25,761 |  |  | 27,150 |
Total held-to-maturity | $ | 588,751 |  |  | 189,836 |

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