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Investment Securities | 3 Months Ended
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Mar. 31, 2022
Investment Securities |
Investment Securities | 7. Investment Securities The cost basis and fair values of investment securities are summarized as follows: Investment securities available for sale (AFS): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2022
​ | ​ | ​ | ​ | ​ | GROSS | ​ | GROSS | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | UNREALIZED | ​ | UNREALIZED | ​ | FAIR
​ |  | COST BASIS |  | GAINS |  | LOSSES |  | VALUE
​ | ​ | (IN THOUSANDS)
U.S. Agency | ​ | $ | 9,674 | ​ | $ | — | ​ | $ | (459) | ​ | $ | 9,215
U.S. Agency mortgage-backed securities | ​ |  | 85,978 | ​ |  | 227 | ​ |  | (4,820) | ​ |  | 81,385
Municipal | ​ |  | 21,543 | ​ |  | 153 | ​ |  | (488) | ​ |  | 21,208
Corporate bonds | ​ |  | 53,335 | ​ |  | 410 | ​ |  | (686) | ​ |  | 53,059
Total | ​ | $ | 170,530 | ​ | $ | 790 | ​ | $ | (6,453) | ​ | $ | 164,867
​ Investment securities held to maturity (HTM): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2022
​ | ​ | ​ | ​ | ​ | GROSS | ​ | GROSS | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | UNREALIZED | ​ | UNREALIZED | ​ | FAIR
​ |  | COST BASIS |  | GAINS |  | LOSSES |  | VALUE
​ | ​ | (IN THOUSANDS)
U.S. Agency | ​ | $ | 2,500 | ​ | $ | — | ​ | $ | (165) | ​ | $ | 2,335
U.S. Agency mortgage-backed securities | ​ | ​ | 14,117 | ​ | ​ | 43 | ​ | ​ | (707) | ​ | ​ | 13,453
Municipal | ​ |  | 34,295 | ​ |  | 438 | ​ |  | (877) | ​ |  | 33,856
Corporate bonds and other securities | ​ |  | 7,507 | ​ |  | 10 | ​ |  | (40) | ​ |  | 7,477
Total | ​ | $ | 58,419 | ​ | $ | 491 | ​ | $ | (1,789) | ​ | $ | 57,121
​ Investment securities available for sale (AFS): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021
​ | ​ | ​ | ​ | ​ | GROSS | ​ | GROSS | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | UNREALIZED | ​ | UNREALIZED | ​ | FAIR
​ |  | COST BASIS |  | GAINS |  | LOSSES |  | VALUE
​ | ​ | (IN THOUSANDS)
U.S. Agency | ​ | $ | 7,371 | ​ | $ | 86 | ​ | $ | (70) | ​ | $ | 7,387
U.S. Agency mortgage-backed securities | ​ |  | 80,136 | ​ |  | 1,202 | ​ |  | (1,171) | ​ |  | 80,167
Municipal | ​ |  | 20,066 | ​ |  | 851 | ​ |  | (25) | ​ |  | 20,892
Corporate bonds | ​ |  | 53,843 | ​ |  | 1,028 | ​ |  | (146) | ​ |  | 54,725
Total | ​ | $ | 161,416 | ​ | $ | 3,167 | ​ | $ | (1,412) | ​ | $ | 163,171
​ Investment securities held to maturity (HTM): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021
​ | ​ | ​ | ​ | ​ | GROSS | ​ | GROSS | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | UNREALIZED | ​ | UNREALIZED | ​ | FAIR
​ | ​ | COST BASIS |  | GAINS |  | LOSSES |  | VALUE
​ | ​ | (IN THOUSANDS)
U.S. Agency |  | $ | 2,500 | ​ | $ | — | ​ | $ | (11) | ​ | $ | 2,489
U.S. Agency mortgage-backed securities |  | ​ | 10,556 | ​ | ​ | 203 | ​ | ​ | (115) | ​ | ​ | 10,644
Municipal | ​ |  | 33,188 | ​ |  | 1,734 | ​ |  | (103) | ​ |  | 34,819
Corporate bonds and other securities | ​ |  | 7,507 | ​ |  | 64 | ​ |  | (7) | ​ |  | 7,564
Total | ​ | $ | 53,751 | ​ | $ | 2,001 | ​ | $ | (236) | ​ | $ | 55,516
​ Maintaining investment quality is a primary objective of the Company’s investment policy which, subject to certain limited exceptions, prohibits the purchase of any investment security below a Moody’s Investor’s Service or Standard & Poor’s rating of “A.” At March 31, 2022, 49.4% of the portfolio was rated “AAA” as compared to 47.1% at December 31, 2021. Approximately 14.1% of the portfolio was either rated below “A” or unrated at March 31, 2022 as compared to 14.7% at December 31, 2021. The Company sold no AFS securities during the first quarter of 2022 and 2021. The carrying value of securities, both available for sale and held to maturity, pledged to secure public and trust deposits was $120,771,000 at March 31, 2022 and $122,574,000 at December 31, 2021. The following tables present information concerning investments with unrealized losses as of March 31, 2022 and December 31, 2021 (in thousands): Total investment securities:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2022
​ | ​ | LESS THAN 12 MONTHS | ​ | 12 MONTHS OR LONGER | ​ | TOTAL
​ | ​ | FAIR | ​ | UNREALIZED | ​ | FAIR | ​ | UNREALIZED | ​ | FAIR | ​ | UNREALIZED
​ |  | VALUE |  | LOSSES |  | VALUE |  | LOSSES |  | VALUE |  | LOSSES
U.S. Agency | ​ | $ | 10,550 | ​ | $ | (624) | ​ | $ | — | ​ | $ | — | ​ | $ | 10,550 | ​ | $ | (624)
U.S. Agency mortgage-backed securities | ​ | ​ | 56,533 | ​ | ​ | (3,356) | ​ | ​ | 17,323 | ​ | ​ | (2,171) | ​ | ​ | 73,856 | ​ | ​ | (5,527)
Municipal | ​ |  | 26,893 | ​ | ​ | (1,271) | ​ | ​ | 951 | ​ | ​ | (94) | ​ | ​ | 27,844 | ​ | ​ | (1,365)
Corporate bonds and other securities | ​ |  | 27,430 | ​ | ​ | (665) | ​ | ​ | 2,439 | ​ | ​ | (61) | ​ | ​ | 29,869 | ​ | ​ | (726)
Total | ​ | $ | 121,406 | ​ | $ | (5,916) | ​ | $ | 20,713 | ​ | $ | (2,326) | ​ | $ | 142,119 | ​ | $ | (8,242)
​ ​ Total investment securities:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021
​ | ​ | LESS THAN 12 MONTHS | ​ | 12 MONTHS OR LONGER | ​ | TOTAL
​ | ​ | FAIR | ​ | UNREALIZED | ​ | FAIR | ​ | UNREALIZED | ​ | FAIR | ​ | UNREALIZED
​ |  | VALUE |  | LOSSES |  | VALUE |  | LOSSES |  | VALUE |  | LOSSES
U.S. Agency | ​ | $ | 7,419 | ​ | $ | (81) | ​ | $ | — | ​ | $ | — | ​ | $ | 7,419 | ​ | $ | (81)
U.S. Agency mortgage-backed securities | ​ | ​ | 45,422 | ​ | ​ | (972) | ​ | ​ | 6,691 | ​ | ​ | (314) | ​ | ​ | 52,113 | ​ | ​ | (1,286)
Municipal | ​ |  | 7,832 | ​ | ​ | (128) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 7,832 | ​ | ​ | (128)
Corporate bonds and other securities | ​ |  | 14,558 | ​ | ​ | (92) | ​ | ​ | 2,439 | ​ | ​ | (61) | ​ | ​ | 16,997 | ​ | ​ | (153)
Total | ​ | $ | 75,231 | ​ | $ | (1,273) | ​ | $ | 9,130 | ​ | $ | (375) | ​ | $ | 84,361 | ​ | $ | (1,648)
​ The unrealized losses are primarily a result of increases in market yields from the time of purchase. In general, as market yields rise, the value of securities will decrease; as market yields fall, the fair value of securities will increase. There are 245 positions that are considered temporarily impaired at March 31, 2022. Management generally views changes in fair value caused by changes in interest rates as temporary; therefore, these securities have not been classified as other-than-temporarily impaired. Management has also concluded that based on current information we expect to continue to receive scheduled interest payments as well as the entire principal balance. Furthermore, management does not intend to sell these securities and does not believe it will be required to sell these securities before they recover in value or mature. The interest rate environment and market yields can also have a significant impact on the yield earned on mortgage-backed securities (MBS). Prepayment speed assumptions are an important factor to consider when evaluating the returns on an MBS. Generally, as interest rates decline, borrowers have more incentive to refinance into a lower rate, so prepayments will rise. Conversely, as interest rates increase, prepayments will decline. When an MBS is purchased at a premium, the yield will decrease as prepayments increase and the yield will increase as prepayments decrease. As of March 31, 2022, the Company had low premium risk as the book value of our mortgage-backed securities purchased at a premium was only 101.0% of the par value. Contractual maturities of securities at March 31, 2022 are shown below (in thousands). Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without prepayment penalties. The weighted average duration of the total investment securities portfolio at March 31, 2022 is 50.5 months and is higher than the duration at December 31, 2021 which was 41.5 months. The duration remains within our internally established guideline to not exceed 60 months which we believe is appropriate to maintain proper levels of liquidity, interest rate risk, market valuation sensitivity and profitability. ​ Total investment securities: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2022
​ | ​ | Available for sale | ​ | Held to maturity
​ |  | Cost Basis |  | Fair Value |  | Cost Basis |  | Fair Value
Within 1 year | ​ | $ | 2,726 | ​ | $ | 2,730 | ​ | $ | 200 | ​ | $ | 203
After 1 year but within 5 years | ​ |  | 37,080 | ​ |  | 36,965 | ​ |  | 12,178 | ​ |  | 12,205
After 5 years but within 10 years | ​ |  | 50,104 | ​ |  | 49,206 | ​ |  | 25,358 | ​ |  | 25,146
Over 10 years | ​ |  | 80,620 | ​ |  | 75,966 | ​ |  | 20,683 | ​ |  | 19,567
Total | ​ | $ | 170,530 | ​ | $ | 164,867 | ​ | $ | 58,419 | ​ | $ | 57,121
​

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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