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Investment Securities | 12 Months Ended
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Dec. 31, 2020
Schedule of Investments [Abstract] |
Investment Securities | (3) Investment Securities A summary of investment securities available-for-sale is as follows: Schedule of Available-for-sale Securities
(Dollars in thousands) |  | As of December 31, 2020 |
|  |  |  |  | Gross |  |  | Gross |  |  |  |
|  | Amortized |  |  | unrealized |  |  | unrealized |  |  | Estimated |
|  | cost |  |  | gains |  |  | losses |  |  | fair value |
U. S. treasury securities |  | $ | 2,000 |  |  | $ | 37 |  |  | $ | - |  |  | $ | 2,037 |
U. S. federal agency obligations |  |  | 18,804 |  |  |  | 138 |  |  |  | (18 | ) |  |  | 18,924 |
Municipal obligations, tax exempt |  |  | 136,321 |  |  |  | 6,367 |  |  |  | (12 | ) |  |  | 142,676 |
Municipal obligations, taxable |  |  | 46,643 |  |  |  | 2,892 |  |  |  | - |  |  |  | 49,535 |
Agency mortgage-backed securities |  |  | 75,530 |  |  |  | 3,108 |  |  |  | - |  |  |  | 78,638 |
Certificates of deposit |  |  | 5,460 |  |  |  | - |  |  |  | - |  |  |  | 5,460 |
Total |  | $ | 284,758 |  |  | $ | 12,542 |  |  | $ | (30 | ) |  | $ | 297,270 |
|  | As of December 31, 2019 |
|  |  |  |  | Gross |  |  | Gross |  |  |  |
|  | Amortized |  |  | unrealized |  |  | unrealized |  |  | Estimated |
|  | cost |  |  | gains |  |  | losses |  |  | fair value |
U. S. treasury securities |  | $ | 2,300 |  |  | $ | 16 |  |  | $ | - |  |  | $ | 2,316 |
U. S. federal agency obligations |  |  | 4,015 |  |  |  | 91 |  |  |  | - |  |  |  | 4,106 |
Municipal obligations, tax exempt |  |  | 142,391 |  |  |  | 3,513 |  |  |  | (42 | ) |  |  | 145,862 |
Municipal obligations, taxable |  |  | 45,541 |  |  |  | 1,293 |  |  |  | (55 | ) |  |  | 46,779 |
Agency mortgage-backed securities |  |  | 159,908 |  |  |  | 2,353 |  |  |  | (230 | ) |  |  | 162,031 |
Certificates of deposit |  |  | 1,904 |  |  |  | - |  |  |  | - |  |  |  | 1,904 |
Total |  | $ | 356,059 |  |  | $ | 7,266 |  |  | $ | (327 | ) |  | $ | 362,998 |
The tables above show that some of the securities in the available-for-sale investment portfolio had unrealized losses, or were temporarily impaired, as of December 31, 2020 and 2019. This temporary impairment represents the estimated amount of loss that would be realized if the securities were sold on the valuation date. Securities which were temporarily impaired are shown below, along with the length of time in a continuous unrealized loss position. Schedule of Available for Sale Securities Continuous Unrealized Loss Position Fair Value
(Dollars in thousands) |  |  | As of December 31, 2020 |
|  |  |  |  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | No. of |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | securities |  |  | value |  |  | losses |  |  | value |  |  | losses |  |  | value |  |  | losses |
U.S. federal agency obligations |  |  | 4 |  |  | $ | 11,772 |  |  | $ | (18 | ) |  | $ | - |  |  | $ | - |  |  | $ | 11,772 |  |  | $ | (18 | )
Municipal obligations, tax exempt |  |  | 12 |  |  |  | 4,191 |  |  |  | (12 | ) |  |  | - |  |  |  | - |  |  |  | 4,191 |  |  |  | (12 | )
Total |  |  | 16 |  |  | $ | 15,963 |  |  | $ | (30 | ) |  | $ | - |  |  | $ | - |  |  | $ | 15,963 |  |  | $ | (30 | )
|  |  |  |  | As of December 31, 2019 |
|  |  |  |  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | No. of |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | securities |  |  | value |  |  | losses |  |  | value |  |  | losses |  |  | value |  |  | losses |
Municipal obligations, tax exempt |  |  | 23 |  |  | $ | 5,676 |  |  | $ | (16 | ) |  | $ | 3,473 |  |  | $ | (26 | ) |  | $ | 9,149 |  |  | $ | (42 | )
Municipal obligations, taxable |  |  | 4 |  |  |  | 2,563 |  |  |  | (55 | ) |  |  | - |  |  |  | - |  |  |  | 2,563 |  |  |  | (55 | )
Agency mortgage-backed securities |  |  | 21 |  |  |  | 15,735 |  |  |  | (43 | ) |  |  | 17,137 |  |  |  | (187 | ) |  |  | 32,872 |  |  |  | (230 | )
Total |  |  | 48 |  |  | $ | 23,974 |  |  | $ | (114 | ) |  | $ | 20,610 |  |  | $ | (213 | ) |  | $ | 44,584 |  |  | $ | (327 | )
The Company’s U.S. federal agency portfolio consists of securities issued by the government-sponsored agencies of Federal Home Loan Mortgage Corporation (“FHLMC”), Federal National Mortgage Association (“FNMA”) and the FHLB. The receipt of principal and interest on U.S. federal agency obligations is guaranteed by the respective government-sponsored agency guarantor, such that the Company believes that its U.S. federal agency obligations do not expose the Company to credit-related losses. Based on these factors, along with the Company’s intent to not sell the securities and its belief that it was more likely than not that the Company will not be required to sell the securities before recovery of their cost basis, the Company believed that the U.S. federal agency obligations identified in the tables above were temporarily impaired. The Company’s portfolio of municipal obligations consists of both tax-exempt and taxable general obligations securities issued by various municipalities. As of December 31, 2020, the Company did not intend to sell and it is more likely than not that the Company will not be required to sell its municipal obligations in an unrealized loss position until the recovery of its cost. Due to the issuers’ continued satisfaction of the securities’ obligations in accordance with their contractual terms and the expectation that they will continue to do so, the evaluation of the fundamentals of the issuers’ financial condition and other objective evidence, the Company believed that the municipal obligations identified in the tables above were temporarily impaired. The table below includes scheduled principal payments and estimated prepayments, based on observable market inputs, for agency mortgage-backed securities. Actual maturities will differ from contractual maturities because borrowers have the right to prepay obligations with or without prepayment penalties. The amortized cost and fair value of investment securities at December 31, 2020 are as follows: Schedule of Investments Classified by Contractual Maturity Date
(Dollars in thousands) |  | Amortized |  |  | Estimated |
|  | cost |  |  | fair value |
Due in less than one year |  | $ | 12,481 |  |  | $ | 12,558 |
Due after one year but within five years |  |  | 148,182 |  |  |  | 153,152 |
Due after five years but within ten years |  |  | 61,972 |  |  |  | 65,783 |
Due after ten years |  |  | 62,123 |  |  |  | 65,777 |
Total |  | $ | 284,758 |  |  | $ | 297,270 |
Sales proceeds and gross realized gains and losses on sales of available-for-sale securities are as follows: Schedule of Realized Gain (loss)
|  | 2020 |  |  | 2019 |  |  | 2018 |
(Dollars in thousands) |  | Years ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Sales proceeds |  | $ | 61,163 |  |  | $ | 15,318 |  |  | $ | 21,126 |
Realized gains |  | $ | 2,449 |  |  | $ | 2 |  |  | $ | 84 |
Realized losses |  |  | (1 | ) |  |  | (179 | ) |  |  | (64 | )
Net realized gains |  | $ | 2,448 |  |  | $ | (177 | ) |  | $ | 20 |
Securities with carrying values of $282.2 million and $240.0 million were pledged to secure public funds on deposit, repurchase agreements and as collateral for borrowings at December 31, 2020 and 2019, respectively. Except for U.S. federal agency obligations, no investment in a single issuer exceeded 10% of consolidated stockholders’ equity.

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- Definition The entire disclosure for investment holdings. This includes the long positions of investments for the entity. It contains investments in affiliated and unaffiliated issuers. The investments include securities and non securities (i.e. commodities and futures contracts). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14) -URI http://asc.fasb.org/extlink&oid=120401592&loc=d3e611322-123010 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B) -URI http://asc.fasb.org/extlink&oid=120401592&loc=d3e611197-123010 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5D -Subparagraph (SX 210.12-13D) -URI http://asc.fasb.org/extlink&oid=120401592&loc=SL120429264-123010 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12) -URI http://asc.fasb.org/extlink&oid=120401592&loc=d3e611133-123010 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5 -Subparagraph (SX 210.12-13) -URI http://asc.fasb.org/extlink&oid=120401592&loc=d3e611282-123010 + Details
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