Annual report pursuant to Section 13 and 15(d)

REGULATORY MATTERS AND CAPITAL (Schedule of Bank Capital and Ratio) (Details)

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REGULATORY MATTERS AND CAPITAL (Schedule of Bank Capital and Ratio) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Equity Tier 1 capital to risk weighted assets, actual amount $ 737,204 $ 699,728
Common Equity Tier 1 capital to risk weighted assets, actual ratio 9.04% 9.72%
Common Equity Tier 1 capital to risk weighted assets, required for capital adequacy purposes, amount $ 367,073 $ 324,035
Common Equity Tier 1 capital to risk weighted assets, required for capital adequacy purposes, ratio 4.50% 4.50%
Tier 1 capital to risk weighted assets, actual amount $ 826,979 $ 790,228
Tier 1 capital to risk weighted assets, actual ratio 10.14% 10.97%
Tier 1 capital to risk weighted assets, required for capital adequacy purposes, amount $ 489,428 $ 432,047
Tier 1 capital ratio of risk-weighted assets 6.00% 6.00%
Total capital to risk weighted assets, actual amount $ 1,013,788 $ 976,145
Total capital to risk weighted assets, actual ratio 12.43% 13.56%
Total capital to risk weighted assets, Required for Capital adequacy purposes, amount $ 652,573 $ 576,062
Total capital to risk weighted assets, required for capital adequacy purposes, ratio 8.00% 8.00%
Tier 1 capital to average adjusted assets, actual amount $ 826,979 $ 790,228
Tier 1 capital to average adjusted assets, actual ratio 9.42% 9.87%
Tier 1 capital to average adjusted assets, required for capital adequacy purposes, amount $ 351,230 $ 320,316
Tier 1 capital to average adjusted assets, required for capital adequacy purposes, ratio 4.00% 4.00%
Union Bank & Trust    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Equity Tier 1 capital to risk weighted assets, actual amount $ 947,432 $ 901,783
Common Equity Tier 1 capital to risk weighted assets, actual ratio 11.66% 12.58%
Common Equity Tier 1 capital to risk weighted assets, required for capital adequacy purposes, amount $ 365,616 $ 322,531
Common Equity Tier 1 capital to risk weighted assets, required for capital adequacy purposes, ratio 4.50% 4.50%
Common Equity Tier 1 capital to risk weighted assets, required in order to be well capitalized under PCA, amount $ 528,111 $ 465,878
Common Equity Tier 1 capital to risk weighted assets, required in order to be well capitalized under PCA, ratio 6.50% 6.50%
Tier 1 capital to risk weighted assets, actual amount $ 947,432 $ 901,783
Tier 1 capital to risk weighted assets, actual ratio 11.66% 12.58%
Tier 1 capital to risk weighted assets, required for capital adequacy purposes, amount $ 487,488 $ 430,042
Tier 1 capital ratio of risk-weighted assets 6.00% 6.00%
Tier 1 capital to risk weighted assets, required in order to be well capitalized under PCA, amount $ 649,983 $ 573,389
Tier 1 capital to risk weighted assets, required in order to be well capitalized under PCA, ratio 8.00% 8.00%
Total capital to risk weighted assets, actual amount $ 986,040 $ 939,700
Total capital to risk weighted assets, actual ratio 12.14% 13.11%
Total capital to risk weighted assets, Required for Capital adequacy purposes, amount $ 649,983 $ 573,390
Total capital to risk weighted assets, required for capital adequacy purposes, ratio 8.00% 8.00%
Total capital to risk weighted assets, required in order to be well capitalized under PCA, amount $ 812,478 $ 716,737
Total capital to risk weighted assets, required in order to be well capitalized under PCA, ratio 10.00% 10.00%
Tier 1 capital to average adjusted assets, actual amount $ 947,432 $ 901,783
Tier 1 capital to average adjusted assets, actual ratio 10.82% 11.31%
Tier 1 capital to average adjusted assets, required for capital adequacy purposes, amount $ 350,126 $ 319,046
Tier 1 capital to average adjusted assets, required for capital adequacy purposes, ratio 4.00% 4.00%
Tier 1 capital to average adjusted assets, required in order to be well capitalized under PCA, amount $ 437,657 $ 398,807
Tier 1 capital to average adjusted assets, required in order to be well capitalized under PCA, ratio 5.00% 5.00%