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ALLOWANCE FOR LOAN LOSSES - Loan Impairment Assessment (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Loan Impairment Assessment      
Unpaid contractual principal balance $ 31,919,000 $ 33,338,000 $ 34,018,000
Recorded investment with no allowance 20,492,000 24,366,000 25,179,000
Recorded investment with allowance 6,554,000 4,425,000 3,733,000
Total recorded investment 27,046,000 28,791,000 28,912,000
Related allowance 1,007,000 500,000 1,035,000
Average recorded investment year‑to‑date 27,112,000 29,008,000 32,860,000
Interest income earned on impaired loans 254,000 321,000  
Commercial and industrial      
Loan Impairment Assessment      
Unpaid contractual principal balance 11,390,000 15,821,000 11,921,000
Recorded investment with no allowance 4,693,000 9,340,000 6,100,000
Recorded investment with allowance 2,169,000 2,475,000 1,192,000
Total recorded investment 6,862,000 11,815,000 7,292,000
Related allowance 845,000 364,000 852,000
Average recorded investment year‑to‑date 7,072,000 12,090,000 12,090,000
Commercial real estate      
Loan Impairment Assessment      
Unpaid contractual principal balance 7,006,000 6,564,000 9,646,000
Recorded investment with no allowance 4,279,000 4,504,000 8,626,000
Recorded investment with allowance 2,523,000 1,866,000 667,000
Total recorded investment 6,802,000 6,370,000 9,293,000
Related allowance 55,000 52,000 64,000
Average recorded investment year‑to‑date 6,902,000 6,408,000 9,438,000
Construction and development      
Loan Impairment Assessment      
Unpaid contractual principal balance 282,000 405,000 296,000
Recorded investment with no allowance 234,000 414,000 251,000
Total recorded investment 234,000 414,000 251,000
Average recorded investment year‑to‑date 238,000 430,000 323,000
1-4 family residential      
Loan Impairment Assessment      
Unpaid contractual principal balance 4,833,000 1,503,000 5,003,000
Recorded investment with no allowance 2,878,000 1,427,000 3,050,000
Recorded investment with allowance 1,862,000   1,874,000
Total recorded investment 4,740,000 1,427,000 4,924,000
Related allowance 107,000   119,000
Average recorded investment year‑to‑date 4,802,000 1,524,000 3,369,000
Multi‑family residential      
Loan Impairment Assessment      
Unpaid contractual principal balance   10,000  
Recorded investment with no allowance   5,000  
Total recorded investment   5,000  
Average recorded investment year‑to‑date   5,000 2,000
Consumer      
Loan Impairment Assessment      
Unpaid contractual principal balance 21,000 84,000  
Recorded investment with no allowance 21,000    
Recorded investment with allowance   84,000  
Total recorded investment 21,000 84,000  
Related allowance   84,000  
Average recorded investment year‑to‑date 21,000 56,000 21,000
Agriculture      
Loan Impairment Assessment      
Unpaid contractual principal balance   278,000  
Recorded investment with no allowance   6,000  
Total recorded investment   6,000  
Average recorded investment year‑to‑date   14,000 1,000
Other      
Loan Impairment Assessment      
Unpaid contractual principal balance 8,387,000 8,673,000 7,152,000
Recorded investment with no allowance 8,387,000 8,670,000 7,152,000
Total recorded investment 8,387,000 8,670,000 7,152,000
Average recorded investment year‑to‑date $ 8,077,000 $ 8,481,000 $ 7,616,000