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SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Summary of Available-For-Sale Securities | Information related to the amortized cost, fair value and allowance for credit losses of securities available-for-sale and the related gross unrealized gains and losses recognized in accumulated other comprehensive income at December 31, 2021 is provided in the tables below.
(dollars in thousands) | Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Losses |  | Fair Value
2021 |  |  |  |  |  |  |
U.S. Treasury securities | $ | 900 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 900 |
U.S. government sponsored agencies | 145,858 |  |  | 39 |  |  | (2,445) |  |  | 143,452 |
Mortgage-backed securities: residential | 487,157 |  |  | 4,455 |  |  | (4,936) |  |  | 486,676 |
Mortgage-backed securities: commercial | 522 |  |  | 1 |  |  | 0 |  |  | 523 |
State and municipal securities | 742,532 |  |  | 25,749 |  |  | (1,274) |  |  | 767,007 |
Total | $ | 1,376,969 |  |  | $ | 30,244 |  |  | $ | (8,655) |  |  | $ | 1,398,558 |
2020 |  |  |  |  |  |  |
U.S. government sponsored agencies | $ | 36,492 |  |  | $ | 56 |  |  | $ | (61) |  |  | $ | 36,487 |
Mortgage-backed securities: residential | 270,231 |  |  | 9,289 |  |  | (17) |  |  | 279,503 |
Mortgage-backed securities: commercial | 35,877 |  |  | 1,004 |  |  | 0 |  |  | 36,881 |
State and municipal securities | 355,306 |  |  | 26,696 |  |  | (28) |  |  | 381,974 |
Total | $ | 697,906 |  |  | $ | 37,045 |  |  | $ | (106) |  |  | $ | 734,845 |
Schedule of Available-For-Sale Securities By Maturity |
(dollars in thousands) | Amortized Cost |  | Fair Value
Due in one year or less | $ | 3,700 |  |  | $ | 3,704 |
Due after one year through five years | 9,534 |  |  | 9,823 |
Due after five years through ten years | 52,232 |  |  | 54,892 |
Due after ten years | 823,824 |  |  | 842,940 |
| 889,290 |  |  | 911,359 |
Mortgage-backed securities | 487,679 |  |  | 487,199 |
Total debt securities | $ | 1,376,969 |  |  | $ | 1,398,558 |
Schedule of Sales of Securities Available For Sale | Security proceeds, gross gains and gross losses for 2021, 2020 and 2019 were as follows:
(dollars in thousands) | 2021 |  | 2020 |  | 2019
Sales of securities available-for-sale |  |  |  |  |
Proceeds | $ | 13,964 |  |  | $ | 8,018 |  |  | $ | 57,114 |
Gross gains | 797 |  |  | 433 |  |  | 279 |
Gross losses | 0 |  |  | 0 |  |  | (137) |
Number of securities | 9 |  |  | 17 |  |  | 46 |
Schedule of Available-For-Sale Securities Continuous Unrealized Loss Position | Information regarding securities with unrealized losses as of December 31, 2021 and 2020 is presented below. The tables distribute the securities between those with unrealized losses for less than twelve months and those with unrealized losses for twelve months or more.
| Less than 12 months |  | 12 months or more |  | Total
(dollars in thousands) | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
2021 |  |  |  |  |  |  |  |  |  |  |
U.S. government sponsored agencies | $ | 85,968 |  |  | $ | 1,364 |  |  | $ | 28,676 |  |  | $ | 1,081 |  |  | $ | 114,644 |  |  | $ | 2,445 |
Mortgage-backed securities: residential | 272,264 |  |  | 4,076 |  |  | 22,792 |  |  | 860 |  |  | 295,056 |  |  | 4,936 |
State and municipal securities | 138,659 |  |  | 1,274 |  |  | 0 |  |  | 0 |  |  | 138,659 |  |  | 1,274 |
Total temporarily impaired | $ | 496,891 |  |  | $ | 6,714 |  |  | $ | 51,468 |  |  | $ | 1,941 |  |  | $ | 548,359 |  |  | $ | 8,655 |
2020 |  |  |  |  |  |  |  |  |  |  |
U.S. government sponsored agencies | $ | 19,800 |  |  | $ | 61 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 19,800 |  |  | $ | 61 |
Mortgage-backed securities: residential | 3 |  |  | 0 |  |  | 3,112 |  |  | 17 |  |  | 3,115 |  |  | 17 |
State and municipal securities | 6,921 |  |  | 28 |  |  | 0 |  |  | 0 |  |  | 6,921 |  |  | 28 |
Total temporarily impaired | $ | 26,724 |  |  | $ | 89 |  |  | $ | 3,112 |  |  | $ | 17 |  |  | $ | 29,836 |  |  | $ | 106 |
Schedule of Quantitative Disclosure of Available-For-Sale Securities | The number of securities with unrealized losses as of December 31, 2021 and 2020 is presented below.
| Less than 12 months |  | 12 months or more |  | Total
2021 |  |  |  |  |
U.S. government sponsored agencies | 8 |  |  | 5 |  |  | 13 |
Mortgage-backed securities: residential | 29 |  |  | 3 |  |  | 32 |
State and municipal securities | 80 |  |  | 0 |  |  | 80 |
Total temporarily impaired | 117 |  |  | 8 |  |  | 125 |
2020 |  |  |  |  |
U.S. government sponsored agencies | 3 |  |  | 0 |  |  | 3 |
Mortgage-backed securities: residential | 2 |  |  | 1 |  |  | 3 |
State and municipal securities | 2 |  |  | 0 |  |  | 2 |
Total temporarily impaired | 7 |  |  | 1 |  |  | 8 |

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