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Investments | 12 Months Ended
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Dec. 31, 2020
Investments [Abstract] |
Investments | Note 4. Investments Available for Sale (AFS) Securities The following table summarizes the amortized cost and fair value of securities available-for-sale and securities held-to-maturity at December 31, 2020 and 2019 and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income (loss) and gross unrecognized gains and losses. The amortized cost and estimated fair value of investment securities available for sale as of December 31, 2020 and 2019 is as follows:
(Dollars in thousands) |  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | unrealized |  | unrealized |  | Fair
December 31, 2020 |  | cost |  | gains |  | losses |  | value
U.S. Government and Agency securities |  | $ | 12,594 |  | $ | 20 |  | $ | (40) |  | $ | 12,574
Municipal securities |  |  | 236,253 |  |  | 11,020 |  |  | (219) |  |  | 247,054
Trust preferred and Corporate securities |  |  | 20,421 |  |  | 22 |  |  | (155) |  |  | 20,288
Agency mortgage-backed securities |  |  | 70,443 |  |  | 1,905 |  |  | (107) |  |  | 72,241
Private-label mortgage-backed securities |  |  | 8,412 |  |  | 56 |  |  | (15) |  |  | 8,453
Asset-backed securities |  |  | 36,246 |  |  | 249 |  |  | (165) |  |  | 36,330
Total |  | $ | 384,369 |  | $ | 13,272 |  | $ | (701) |  | $ | 396,940
(Dollars in thousands) |  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | unrealized |  | unrealized |  | Fair
December 31, 2019 |  | cost |  | gains |  | losses |  | value
U.S. Government and Agency securities |  | $ | 8,418 |  | $ | 30 |  | $ | (20) |  | $ | 8,428
Municipal securities |  |  | 90,865 |  |  | 1,418 |  |  | (997) |  |  | 91,286
Trust preferred and Corporate securities |  |  | 4,097 |  |  | — |  |  | (130) |  |  | 3,967
Agency mortgage-backed securities |  |  | 58,503 |  |  | 435 |  |  | (234) |  |  | 58,704
Private-label mortgage-backed securities |  |  | 398 |  |  | 31 |  |  | — |  |  | 429
Asset-backed securities |  |  | 24,918 |  |  | 6 |  |  | (305) |  |  | 24,619
Total |  | $ | 187,199 |  | $ | 1,920 |  | $ | (1,686) |  | $ | 187,433
At December 31, 2020 and 2019, the fair value of investment securities pledged to secure public funds and trust deposits totaled $137.4 million and $107.1 million, respectively. The Bank has no investment in a single issuer that exceeds 10% of shareholders equity. The amortized cost and estimated fair value of debt securities at December 31, 2020, by contractual maturity are shown below. Actual maturities may differ from contractual maturities because of prepayment or call options embedded in the securities. Mortgage-backed securities without defined maturity dates are reported on a separate line.
(Dollars in thousands) |  |  |  |  | Amortized ‎cost |  | Fair ‎value
Due in one year or less |  |  |  |  | $ | 4,369 |  | $ | 4,388
Due after one year through five years |  |  |  |  |  | 21,250 |  |  | 21,857
Due after five years through ten years |  |  |  |  |  | 216,196 |  |  | 225,142
Due after ten years |  |  |  |  |  | 27,453 |  |  | 28,529
|  |  |  |  |  | 269,268 |  |  | 279,916
Mortgage-backed and asset-backed securities |  |  |  |  |  | 115,101 |  |  | 117,024
Total |  |  |  |  | $ | 384,369 |  | $ | 396,940
The composition of the net realized securities gains for the years ended December 31 is as follows:
(Dollars in thousands) |  | 2020 |  | 2019
Proceeds |  | $ | 3,141 |  | $ | 18,781
Gross gains realized |  |  | 62 |  |  | 285
Gross losses realized |  |  | (33) |  |  | (29)
Net gains realized |  | $ | 29 |  | $ | 256
Tax (provision) benefit on net gains (losses) realized |  | $ | 6 |  | $ | 54
Impairment: The following table reflects the temporary impairment in the investment portfolio, aggregated by investment category, length of time that individual securities have been in a continuous unrealized loss position and the number of securities in each category as of December 31, 2020 and 2019. For securities with an unrealized loss, Management applies a systematic methodology in order to perform an assessment of the potential for other-than-temporary impairment. In the case of debt securities, investments considered for other-than-temporary impairment: (1) had a specified maturity or repricing date, (2) were generally expected to be redeemed at par, and (3) were expected to achieve a recovery in market value within a reasonable period of time. In addition, the Bank considers whether it intends to sell these securities or whether it will be forced to sell these securities before the earlier of amortized cost recovery or maturity. The impairment identified on debt securities and subject to assessment at December 31, 2020, was deemed to be temporary and required no further adjustments to the financial statements, unless otherwise noted.
| December 31, 2020
| Less than 12 months |  | 12 months or more |  | Total
| Fair |  | Unrealized |  |  |  | Fair |  | Unrealized |  |  |  | Fair |  | Unrealized |  |
(Dollars in thousands) | Value |  | Losses |  | Count |  | Value |  | Losses |  | Count |  | Value |  | Losses |  | Count
U.S. Government and Agency securities | $ | 3,966 |  | $ | (21) |  | 5 |  | $ | 4,185 |  | $ | (19) |  | 11 |  | $ | 8,151 |  | $ | (40) |  | 16
Municipal securities |  | 27,022 |  |  | (219) |  | 28 |  |  | — |  |  | — |  | — |  |  | 27,022 |  |  | (219) |  | 28
Trust preferred and Corporate securities |  | 7,576 |  |  | (37) |  | 13 |  |  | 3,040 |  |  | (118) |  | 4 |  |  | 10,616 |  |  | (155) |  | 17
Agency mortgage-backed securities |  | 18,390 |  |  | (101) |  | 17 |  |  | 3,355 |  |  | (6) |  | 5 |  |  | 21,745 |  |  | (107) |  | 22
Private-label mortgage-backed securities |  | 2,506 |  |  | (15) |  | 2 |  |  | — |  |  | — |  | — |  |  | 2,506 |  |  | (15) |  | 2
Asset-backed securities |  | 1,458 |  |  | (12) |  | 2 |  |  | 11,452 |  |  | (153) |  | 15 |  |  | 12,910 |  |  | (165) |  | 17
Total temporarily impaired securities | $ | 60,918 |  | $ | (405) |  | 67 |  | $ | 22,032 |  | $ | (296) |  | 35 |  | $ | 82,950 |  | $ | (701) |  | 102
| December 31, 2019
| Less than 12 months |  | 12 months or more |  | Total
| Fair |  | Unrealized |  |  |  | Fair |  | Unrealized |  |  |  | Fair |  | Unrealized |  |
(Dollars in thousands) | Value |  | Losses |  | Count |  | Value |  | Losses |  | Count |  | Value |  | Losses |  | Count
U.S. Government and Agency securities | $ | 2,559 |  | $ | (12) |  | 6 |  | $ | 1,335 |  | $ | (8) |  | 7 |  | $ | 3,894 |  | $ | (20) |  | 13
Municipal securities |  | 38,874 |  |  | (966) |  | 40 |  |  | 2,655 |  |  | (31) |  | 4 |  |  | 41,529 |  |  | (997) |  | 44
Trust preferred and Corporate securities |  | — |  |  | — |  | — |  |  | 3,967 |  |  | (130) |  | 5 |  |  | 3,967 |  |  | (130) |  | 5
Agency mortgage-backed securities |  | 21,185 |  |  | (185) |  | 32 |  |  | 6,555 |  |  | (49) |  | 22 |  |  | 27,740 |  |  | (234) |  | 54
Asset-backed securities |  | 17,644 |  |  | (128) |  | 19 |  |  | 5,669 |  |  | (177) |  | 9 |  |  | 23,313 |  |  | (305) |  | 28
Total temporarily impaired securities | $ | 80,262 |  | $ | (1,291) |  | 97 |  | $ | 20,181 |  | $ | (395) |  | 47 |  | $ | 100,443 |  | $ | (1,686) |  | 144
The following table represents the cumulative credit losses on debt securities recognized in earnings as of December 31, 2020
(Dollars in thousands) |  | Twelve Months Ended
|  | 2020 |  | 2019
Balance of cumulative credit-related OTTI at January 1 |  | $ | 272 |  | $ | 272
Additions for credit-related OTTI not previously recognized |  |  | — |  |  | —
Additional increases for credit-related OTTI previously recognized when there is |  |  |  |  |  |
no intent to sell and no requirement to sell before recovery of amortized cost basis |  |  | — |  |  | —
Decreases for previously recognized credit-related OTTI because there was an intent to sell |  |  | — |  |  | —
Reduction for increases in cash flows expected to be collected |  |  | — |  |  | —
Balance of credit-related OTTI at December 31 |  | $ | 272 |  | $ | 272
Equity Securities at fair value The Corporation owns one equity investment with a readily determinable fair value. At December 31, 2020 and 2019, this investment was reported at a fair value of $391 thousand and $440 thousand, respectively, with changes in value reported through income.

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