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Segment Reporting - Results for Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |
Net interest income | $ 9,347 | $ 8,328 | $ 27,753 | $ 23,144 |
Provision | 883 | 789 | 1,998 | 2,149 |
Total non-interest income | 1,414 | 2,112 | 3,970 | 4,384 |
Total non-interest expense | 8,546 | 9,142 | 25,503 | 23,935 |
Income before income taxes | 1,332 | 509 | 4,222 | 1,444 |
Provision for income taxes | 214 | 269 | 865 | 431 |
Net income | 1,118 | 240 | 3,357 | 1,013 |
Total assets | 771,930 | 802,565 | 771,930 | 802,565 | $ 791,939
Total investment securities | 114,309 | 159,496 | 114,309 | 159,496 |
Total loans, net | 544,519 | 519,822 | 544,519 | 519,822 | 514,867
Goodwill and core deposit intangible, net | 8,934 | 9,557 | 8,934 | 9,557 | 9,312
Investment in subsidiaries | 5 | 5 | 5 | 5 |
Fixed asset additions | 214 | 292 | 2,856 | 653 |
Depreciation and amortization expense | 409 | 374 | 1,205 | 1,078 |
Total interest income from external customers | 11,027 | 9,452 | 32,763 | 25,961 |
Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |
Total non-interest income | (1,494) | (636) | (4,536) | (2,244) |
Total non-interest expense | (149) | (205) | (477) | (593) |
Income before income taxes | (1,345) | (431) | (4,059) | (1,651) |
Net income | (1,345) | (431) | (4,059) | (1,651) |
Total assets | (200,099) | (192,663) | (200,099) | (192,663) |
Total loans, net | (95,565) | (92,979) | (95,565) | (92,979) |
Investment in subsidiaries | (83,460) | (77,242) | (83,460) | (77,242) |
Total interest income from affiliates | (1,351) | (1,217) | (3,730) | (3,468) |
FUSB [Member] |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |
Provision |  |  | 635 |  | 215
Total loans, net | 438,296 |  | 438,296 |  | 414,430
FUSB [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |
Net interest income | 6,205 | 5,001 | 18,200 | 13,362 |
Provision | 545 | 176 | 635 | 215 |
Total non-interest income | 1,176 | 1,850 | 3,362 | 3,665 |
Total non-interest expense | 5,773 | 6,508 | 17,404 | 15,927 |
Income before income taxes | 1,063 | 167 | 3,523 | 885 |
Provision for income taxes | 136 | 195 | 647 | 325 |
Net income | 927 | (28) | 2,876 | 560 |
Total assets | 773,036 | 805,007 | 773,036 | 805,007 |
Total investment securities | 114,229 | 159,416 | 114,229 | 159,416 |
Total loans, net | 533,861 | 509,695 | 533,861 | 509,695 |
Goodwill and core deposit intangible, net | 8,934 | 9,557 | 8,934 | 9,557 |
Investment in subsidiaries | 5 | 5 | 5 | 5 |
Fixed asset additions | 172 | 195 | 2,736 | 500 |
Depreciation and amortization expense | 372 | 334 | 1,100 | 973 |
Total interest income from external customers | 6,546 | 4,916 | 19,515 | 12,736 |
Total interest income from affiliates | 1,345 | 1,212 | 3,712 | 3,455 |
ALC [Member] |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |
Provision |  |  | 1,363 |  | 2,407
Total loans, net | 106,223 |  | 106,223 |  | $ 100,437
ALC [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |
Net interest income | 3,136 | 3,322 | 9,534 | 9,769 |
Provision | 338 | 613 | 1,363 | 1,934 |
Total non-interest income | 212 | 268 | 659 | 796 |
Total non-interest expense | 2,467 | 2,384 | 7,201 | 7,334 |
Income before income taxes | 543 | 593 | 1,629 | 1,297 |
Provision for income taxes | 139 | 131 | 403 | 283 |
Net income | 404 | 462 | 1,226 | 1,014 |
Total assets | 109,852 | 105,859 | 109,852 | 105,859 |
Total loans, net | 106,223 | 103,106 | 106,223 | 103,106 |
Fixed asset additions | 42 | 97 | 120 | 153 |
Depreciation and amortization expense | 37 | 40 | 105 | 105 |
Total interest income from external customers | 4,480 | 4,536 | 13,246 | 13,225 |
Other Segments [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |
Net interest income | 6 | 5 | 19 | 13 |
Total non-interest income | 1,520 | 630 | 4,485 | 2,167 |
Total non-interest expense | 455 | 455 | 1,375 | 1,267 |
Income before income taxes | 1,071 | 180 | 3,129 | 913 |
Provision for income taxes | (61) | (57) | (185) | (177) |
Net income | 1,132 | 237 | 3,314 | 1,090 |
Total assets | 89,141 | 84,362 | 89,141 | 84,362 |
Total investment securities | 80 | 80 | 80 | 80 |
Investment in subsidiaries | 83,460 | 77,242 | 83,460 | 77,242 |
Total interest income from external customers | 1 |  | 2 |  |
Total interest income from affiliates | $ 6 | $ 5 | $ 18 | $ 13 |

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