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Securities (Tables) | 9 Months Ended
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Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | The fair value of securities and the related gross unrealized gains and losses recognized in accumulated other comprehensive income are shown below.
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
September 30, 2018 |  |  |  |  |  |  |
Certificates of deposit | $ | 89,175 |  |  | $ | — |  |  | $ | — |  |  | $ | 89,175 |
Mortgage-backed securities - residential | 10,593 |  |  | 393 |  |  | (61 | ) |  | 10,925 |
Collateralized mortgage obligations - residential | 3,819 |  |  | 13 |  |  | (11 | ) |  | 3,821 |
| $ | 103,587 |  |  | $ | 406 |  |  | $ | (72 | ) |  | $ | 103,921 |
December 31, 2017 |  |  |  |  |  |  |
Certificates of deposit | $ | 75,916 |  |  | $ | — |  |  | $ | — |  |  | $ | 75,916 |
Equity mutual fund | 500 |  |  | — |  |  | (1 | ) |  | 499 |
Mortgage-backed securities - residential | 11,969 |  |  | 520 |  |  | (17 | ) |  | 12,472 |
Collateralized mortgage obligations - residential | 4,481 |  |  | 16 |  |  | (11 | ) |  | 4,486 |
SBA-guaranteed loan participation certificates | 10 |  |  | — |  |  | — |  |  | 10 |
| $ | 92,876 |  |  | $ | 536 |  |  | $ | (29 | ) |  | $ | 93,383 |
The mortgage-backed securities and collateralized mortgage obligations reflected in the preceding table were issued by U.S. government-sponsored entities or agencies, Freddie Mac, Fannie Mae and Ginnie Mae, and are obligations which the government has affirmed its commitment to support. All securities reflected in the preceding table were classified as available-for-sale at September 30, 2018 and December 31, 2017. The amortized cost and fair values of securities by contractual maturity are shown below. Securities not due at a single maturity date are shown separately. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
| September 30, 2018
| Amortized Cost |  | Fair Value
Due in one year or less | $ | 89,175 |  |  | $ | 89,175 |
Mortgage-backed securities - residential | 10,593 |  |  | 10,925 |
Collateralized mortgage obligations - residential | 3,819 |  |  | 3,821 |
| $ | 103,587 |  |  | $ | 103,921 |
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Proceeds | $ | — |  |  | $ | — |  |  | $ | 487 |  |  | $ | — |
Gross gains | — |  |  | — |  |  | — |  |  | — |
Gross losses | — |  |  | — |  |  | (14 | ) |  | — |
Securities with unrealized losses not recognized in income are as follows:
| Less than 12 Months |  | 12 Months or More |  | Total
| Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss
September 30, 2018 |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities - residential | $ | 924 |  |  | $ | (6 | ) |  | $ | 1,004 |  |  | $ | (55 | ) |  | $ | 1,928 |  |  | $ | (61 | )
Collateralized mortgage obligations - residential | — |  |  | — |  |  | 1,796 |  |  | (11 | ) |  | 1,796 |  |  | (11 | )
| $ | 924 |  |  | $ | (6 | ) |  | $ | 2,800 |  |  | $ | (66 | ) |  | $ | 3,724 |  |  | $ | (72 | )
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Equity mutual fund | $ | 499 |  |  | $ | (1 | ) |  | $ | — |  |  | $ | — |  |  | $ | 499 |  |  | $ | (1 | )
Mortgage-backed securities - residential | — |  |  | — |  |  | 1,149 |  |  | (17 | ) |  | 1,149 |  |  | (17 | )
Collateralized mortgage obligations - residential | — |  |  | — |  |  | 2,083 |  |  | (11 | ) |  | 2,083 |  |  | (11 | )
| $ | 499 |  |  | $ | (1 | ) |  | $ | 3,232 |  |  | $ | (28 | ) |  | $ | 3,731 |  |  | $ | (29 | )
The Company evaluates marketable investment securities with significant declines in fair value on a quarterly basis to determine whether they should be considered other-than-temporarily impaired under current accounting guidance, which generally provides that if a marketable security is in an unrealized loss position, whether due to general market conditions or industry or issuer-specific factors, the holder of the securities must assess whether the impairment is other-than-temporary. Certain mortgage-backed securities and collateralized mortgage obligations that the Company holds in its investment portfolio were in an unrealized loss position at September 30, 2018, but the unrealized losses were not considered significant under the Company’s impairment testing methodology. In addition, the Company does not intend to sell these securities, and it is likely that the Company will not be required to sell these securities before their anticipated recovery occurs.
Unrealized gains and losses recognized in accumulated other comprehensive income (loss) | The fair value of securities and the related gross unrealized gains and losses recognized in accumulated other comprehensive income are shown below.
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
September 30, 2018 |  |  |  |  |  |  |
Certificates of deposit | $ | 89,175 |  |  | $ | — |  |  | $ | — |  |  | $ | 89,175 |
Mortgage-backed securities - residential | 10,593 |  |  | 393 |  |  | (61 | ) |  | 10,925 |
Collateralized mortgage obligations - residential | 3,819 |  |  | 13 |  |  | (11 | ) |  | 3,821 |
| $ | 103,587 |  |  | $ | 406 |  |  | $ | (72 | ) |  | $ | 103,921 |
December 31, 2017 |  |  |  |  |  |  |
Certificates of deposit | $ | 75,916 |  |  | $ | — |  |  | $ | — |  |  | $ | 75,916 |
Equity mutual fund | 500 |  |  | — |  |  | (1 | ) |  | 499 |
Mortgage-backed securities - residential | 11,969 |  |  | 520 |  |  | (17 | ) |  | 12,472 |
Collateralized mortgage obligations - residential | 4,481 |  |  | 16 |  |  | (11 | ) |  | 4,486 |
SBA-guaranteed loan participation certificates | 10 |  |  | — |  |  | — |  |  | 10 |
| $ | 92,876 |  |  | $ | 536 |  |  | $ | (29 | ) |  | $ | 93,383 |
Amortized cost and fair values of securities | The amortized cost and fair values of securities by contractual maturity are shown below. Securities not due at a single maturity date are shown separately. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
| September 30, 2018
| Amortized Cost |  | Fair Value
Due in one year or less | $ | 89,175 |  |  | $ | 89,175 |
Mortgage-backed securities - residential | 10,593 |  |  | 10,925 |
Collateralized mortgage obligations - residential | 3,819 |  |  | 3,821 |
| $ | 103,587 |  |  | $ | 103,921 |
Securities with unrealized losses | Securities with unrealized losses not recognized in income are as follows:
| Less than 12 Months |  | 12 Months or More |  | Total
| Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss
September 30, 2018 |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities - residential | $ | 924 |  |  | $ | (6 | ) |  | $ | 1,004 |  |  | $ | (55 | ) |  | $ | 1,928 |  |  | $ | (61 | )
Collateralized mortgage obligations - residential | — |  |  | — |  |  | 1,796 |  |  | (11 | ) |  | 1,796 |  |  | (11 | )
| $ | 924 |  |  | $ | (6 | ) |  | $ | 2,800 |  |  | $ | (66 | ) |  | $ | 3,724 |  |  | $ | (72 | )
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Equity mutual fund | $ | 499 |  |  | $ | (1 | ) |  | $ | — |  |  | $ | — |  |  | $ | 499 |  |  | $ | (1 | )
Mortgage-backed securities - residential | — |  |  | — |  |  | 1,149 |  |  | (17 | ) |  | 1,149 |  |  | (17 | )
Collateralized mortgage obligations - residential | — |  |  | — |  |  | 2,083 |  |  | (11 | ) |  | 2,083 |  |  | (11 | )
| $ | 499 |  |  | $ | (1 | ) |  | $ | 3,232 |  |  | $ | (28 | ) |  | $ | 3,731 |  |  | $ | (29 | )

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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 + Details
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