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Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2019
Investments [Abstract] |
Unrealized Gain (Loss) on Investments [Table Text Block] | The cost basis and fair values of investment securities are summarized as follows (in thousands): Investment securities available for sale (AFS):
|  | June 30, 2019 |
|  | Cost Basis |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
US Agency |  | $ | 7,489 |  |  | $ | 54 |  |  | $ | — |  |  | $ | 7,543 |
US Agency mortgage-backed securities |  |  | 90,523 |  |  |  | 1,602 |  |  |  | (167 | ) |  |  | 91,958 |
Municipal |  |  | 13,994 |  |  |  | 499 |  |  |  | (22 | ) |  |  | 14,471 |
Corporate bonds |  |  | 37,312 |  |  |  | 258 |  |  |  | (454 | ) |  |  | 37,116 |
Total |  | $ | 149,318 |  |  | $ | 2,413 |  |  | $ | (643 | ) |  | $ | 151,088 |
Investment securities held to maturity (HTM):
|  | June 30, 2019 |
|  | Cost Basis |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
US Agency mortgage-backed securities |  | $ | 9,501 |  |  | $ | 197 |  |  | $ | (18 | ) |  | $ | 9,680 |
Municipal |  |  | 24,216 |  |  |  | 881 |  |  |  | (44 | ) |  |  | 25,053 |
Corporate bonds and other securities |  |  | 6,035 |  |  |  | 49 |  |  |  | (42 | ) |  |  | 6,042 |
Total |  | $ | 39,752 |  |  | $ | 1,127 |  |  | $ | (104 | ) |  | $ | 40,775 |
Investment securities available for sale (AFS):
|  | December 31, 2018 |
|  | Cost Basis |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
US Agency |  | $ | 7,685 |  |  | $ | 4 |  |  | $ | (160 | ) |  | $ | 7,529 |
US Agency mortgage-backed securities |  |  | 90,169 |  |  |  | 516 |  |  |  | (1,158 | ) |  |  | 89,527 |
Municipal |  |  | 13,301 |  |  |  | 114 |  |  |  | (234 | ) |  |  | 13,181 |
Corporate bonds |  |  | 37,359 |  |  |  | 131 |  |  |  | (996 | ) |  |  | 36,494 |
Total |  | $ | 148,514 |  |  | $ | 765 |  |  | $ | (2,548 | ) |  | $ | 146,731 |
Investment securities held to maturity (HTM):
|  | December 31, 2018 |
|  | Cost Basis |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
US Agency mortgage-backed securities |  | $ | 9,983 |  |  | $ | 78 |  |  | $ | (132 | ) |  | $ | 9,929 |
Municipal |  |  | 24,740 |  |  |  | 131 |  |  |  | (404 | ) |  |  | 24,467 |
Corporate bonds and other securities |  |  | 6,037 |  |  |  | 13 |  |  |  | (122 | ) |  |  | 5,928 |
Total |  | $ | 40,760 |  |  | $ | 222 |  |  | $ | (658 | ) |  | $ | 40,324 |
Schedule of Unrealized Loss on Investments [Table Text Block] | The following tables present information concerning investments with unrealized losses as of June 30, 2019 and December 31, 2018 (in thousands): Total investment securities:
|  | June 30, 2019 |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
US Agency |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
US Agency mortgage-backed securities |  |  | — |  |  |  | — |  |  |  | 21,440 |  |  |  | (185 | ) |  |  | 21,440 |  |  |  | (185 | )
Municipal |  |  | — |  |  |  | — |  |  |  | 2,468 |  |  |  | (66 | ) |  |  | 2,468 |  |  |  | (66 | )
Corporate bonds and other securities |  |  | 4,922 |  |  |  | (77 | ) |  |  | 18,182 |  |  |  | (419 | ) |  |  | 23,104 |  |  |  | (496 | )
Total |  | $ | 4,922 |  |  | $ | (77 | ) |  | $ | 42,090 |  |  | $ | (670 | ) |  | $ | 47,012 |  |  | $ | (747 | )
Total investment securities:
|  | December 31, 2018 |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
US Agency |  | $ | 244 |  |  | $ | (6 | ) |  | $ | 5,631 |  |  | $ | (154 | ) |  | $ | 5,875 |  |  | $ | (160 | )
US Agency mortgage-backed securities |  |  | 17,718 |  |  |  | (177 | ) |  |  | 39,983 |  |  |  | (1,113 | ) |  |  | 57,701 |  |  |  | (1,290 | )
Municipal |  |  | 6,601 |  |  |  | (71 | ) |  |  | 15,880 |  |  |  | (567 | ) |  |  | 22,481 |  |  |  | (638 | )
Corporate bonds and other securities |  |  | 15,221 |  |  |  | (440 | ) |  |  | 17,038 |  |  |  | (678 | ) |  |  | 32,259 |  |  |  | (1,118 | )
Total |  | $ | 39,784 |  |  | $ | (694 | ) |  | $ | 78,532 |  |  | $ | (2,512 | ) |  | $ | 118,316 |  |  | $ | (3,206 | )
Investments Classified by Contractual Maturity Date [Table Text Block] | Total investment securities:
|  | June 30, 2019 |
|  | Available for sale |  |  | Held to maturity |
|  | Cost Basis |  |  | Fair Value |  |  | Cost Basis |  |  | Fair Value |
Within 1 year |  | $ | 2,500 |  |  | $ | 2,502 |  |  | $ | 1,000 |  |  | $ | 995 |
After 1 year but within 5 years |  |  | 20,264 |  |  |  | 20,319 |  |  |  | 5,178 |  |  |  | 5,196 |
After 5 years but within 10 years |  |  | 44,101 |  |  |  | 44,554 |  |  |  | 20,018 |  |  |  | 20,696 |
After 10 years but within 15 years |  |  | 28,373 |  |  |  | 28,849 |  |  |  | 8,201 |  |  |  | 8,477 |
Over 15 years |  |  | 54,080 |  |  |  | 54,864 |  |  |  | 5,355 |  |  |  | 5,411 |
Total |  | $ | 149,318 |  |  | $ | 151,088 |  |  | $ | 39,752 |  |  | $ | 40,775 |

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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