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ALLOWANCE FOR LOAN LOSSES - Loan Impairment Assessment (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Loan Impairment Assessment |  |  |
Unpaid contractual principal balance | $ 34,018,000 | $ 34,393,000 |
Recorded investment with no allowance | 25,179,000 | 23,562,000 |
Recorded investment with allowance | 3,733,000 | 6,093,000 |
Total recorded investment | 28,912,000 | 29,655,000 |
Related allowance | 1,035,000 | 668,000 |
Average recorded investment year-to-date | 32,860,000 | 29,202,000 |
Interest income earned on impaired loans | 1,100,000 | 648,000 | $ 201,000
Commercial and industrial |  |  |
Loan Impairment Assessment |  |  |
Unpaid contractual principal balance | 11,921,000 | 16,483,000 |
Recorded investment with no allowance | 6,100,000 | 8,088,000 |
Recorded investment with allowance | 1,192,000 | 4,227,000 |
Total recorded investment | 7,292,000 | 12,315,000 |
Related allowance | 852,000 | 462,000 |
Average recorded investment year-to-date | 12,090,000 | 15,550,000 |
Commercial real estate |  |  |
Loan Impairment Assessment |  |  |
Unpaid contractual principal balance | 9,646,000 | 6,454,000 |
Recorded investment with no allowance | 8,626,000 | 4,398,000 |
Recorded investment with allowance | 667,000 | 1,866,000 |
Total recorded investment | 9,293,000 | 6,264,000 |
Related allowance | 64,000 | 206,000 |
Average recorded investment year-to-date | 9,438,000 | 5,903,000 |
Construction and development |  |  |
Loan Impairment Assessment |  |  |
Unpaid contractual principal balance | 296,000 | 506,000 |
Recorded investment with no allowance | 251,000 | 476,000 |
Total recorded investment | 251,000 | 476,000 |
Average recorded investment year-to-date | 323,000 | 754,000 |
One to four family residential |  |  |
Loan Impairment Assessment |  |  |
Unpaid contractual principal balance | 5,003,000 | 1,781,000 |
Recorded investment with no allowance | 3,050,000 | 1,712,000 |
Recorded investment with allowance | 1,874,000 |  |
Total recorded investment | 4,924,000 | 1,712,000 |
Related allowance | 119,000 |  |
Average recorded investment year-to-date | 3,369,000 | 1,403,000 |
Multi‑family residential |  |  |
Loan Impairment Assessment |  |  |
Unpaid contractual principal balance |  | 13,000 |
Recorded investment with no allowance |  | 7,000 |
Total recorded investment |  | 7,000 |
Average recorded investment year-to-date | 2,000 | 10,000 |
Consumer |  |  |
Loan Impairment Assessment |  |  |
Average recorded investment year-to-date | 21,000 | 8,000 |
Agriculture |  |  |
Loan Impairment Assessment |  |  |
Unpaid contractual principal balance |  | 307,000 |
Recorded investment with no allowance |  | 36,000 |
Total recorded investment |  | 36,000 |
Average recorded investment year-to-date | 1,000 | 34,000 |
Other |  |  |
Loan Impairment Assessment |  |  |
Unpaid contractual principal balance | 7,152,000 | 8,849,000 |
Recorded investment with no allowance | 7,152,000 | 8,845,000 |
Total recorded investment | 7,152,000 | 8,845,000 |
Average recorded investment year-to-date | $ 7,616,000 | $ 5,540,000 |

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