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Regulatory Capital Requirements (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Adjustments to net loss as well as the capital ratios [Abstract]
Net income	$ 4,122	$ 2,030	$ 2,034	$ 2,189	$ 6,407	$ 1,534	$ 1,461	$ 1,591	$ 10,375	$ 10,993
Royal Bank [Member]
Capital actual amount under regulations [Abstract]
Total capital (to risk-weighted assets)	76,716				87,354				76,716	87,354
Tier I capital (to risk-weighted assets)	68,743				80,410				68,743	80,410
Tier I capital (to average assets, leverage)	68,743				80,410				68,743	80,410
Common equity Tier 1 (to risk-weighted assets)	69,681				58,824				69,681	58,824
For capital adequacy purposes, amount [Abstract]
Total capital (to risk-weighted assets)	54,301				44,225				54,301	44,225
Tier I capital (to risk-weighted assets)	41,709				33,169				41,709	33,169
Tier I capital (to average assets, leverage)	32,076				30,374				32,076	30,374
Common equity Tier 1 (to risk-weighted assets)	$ 32,266				$ 24,876				$ 32,266	$ 24,876
For capital adequacy purposes, ratio [Abstract]
Total capital (to risk-weighted assets) (in hundredths)	8.625%				8.00%				8.625%	8.00%
Tier I capital (to risk-weighted assets) (in hundredths)	6.625%				6.00%				6.625%	6.00%
Tier I capital (to average assets, leverage) (in hundredths)	4.00%				4.00%				4.00%	4.00%
Common equity Tier 1 (to risk-weighted assets) (in hundredths)	5.125%				4.50%				5.125%	4.50%
To be well capitalized under prompt corrective action provision, amount [Abstract]
Total capital (to risk-weighted assets)	$ 62,957				$ 55,281				$ 62,957	$ 55,281
Tier I capital (to risk-weighted assets)	50,366				44,225				50,366	44,225
Tier I capital (to average assets, leverage)	40,095				37,968				40,095	37,968
Common equity Tier 1 (to risk-weighted assets)	$ 40,922				$ 35,933				$ 40,922	$ 35,933
To be well capitalized under prompt corrective action provision, ratio [Abstract]
Total capital (to risk-weighted assets) (in hundredths)	10.00%				10.00%				10.00%	10.00%
Tier I capital (to risk-weighted assets) (in hundredths)	8.00%				6.00%				8.00%	6.00%
Tier I capital (to average assets, leverage) (in hundredths)	5.00%				5.00%				5.00%	5.00%
Common equity Tier 1 (to risk-weighted assets) (in hundredths)	6.50%				6.50%				6.50%	6.50%
To be well capitalized under the Federal Reserve's regulations, amount
Total capital (to risk-weighted assets)	$ 62,957				$ 55,281				$ 62,957	$ 55,281
Tier I capital (to risk-weighted assets)	$ 50,366				$ 44,225				$ 50,366	$ 44,225
To be well capitalized under the Federal Reserve's regulations, ratio
Total capital (to risk-weighted assets) (in hundredths)	10.00%				10.00%				10.00%	10.00%
Tier I capital (to risk-weighted assets) (in hundredths)	8.00%				6.00%				8.00%	6.00%
Adjustments to net loss as well as the capital ratios [Abstract]
RAP net income									$ (8,775)	$ (9,161)
Tax lien adjustment, net of noncontrolling interest									(1,544)	(1,973)
Net income									$ 10,319	$ 11,134
Actual Ratio Under US GAAP [Abstract]
Total capital (to risk-weighted assets) (in hundredths)	12.405%				16.109%				12.405%	16.109%
Tier I capital (to risk-weighted assets) (in hundredths)	11.139%				14.853%				11.139%	14.853%
Tier I capital (to average assets, leverage) (in hundredths)	8.75%				10.824%				8.75%	10.824%
Common equity Tier 1 (to risk-weighted assets) (in hundredths)	11.04%				10.962%				11.04%	10.962%
Ratios As Adjusted Under RAP [Abstract]
Total capital (to risk-weighted assets) (in hundredths)	12.185%				15.802%				12.185%	15.802%
Tier I capital (to risk-weighted assets) (in hundredths)	10.919%				14.546%				10.919%	14.546%
Tier I capital (to average assets, leverage) (in hundredths)	8.573%				10.589%				8.573%	10.589%
Common equity Tier 1 (to risk-weighted assets) (in hundredths)	11.068%				10.641%				11.068%	10.641%
Royal Bancshares [Member]
Capital actual amount under regulations [Abstract]
Total capital (to risk-weighted assets)	$ 84,056				$ 103,355				$ 84,056	$ 103,355
Tier I capital (to risk-weighted assets)	68,326				95,316				68,326	95,316
Tier I capital (to average assets, leverage)	68,326				95,316				68,326	95,316
Common equity Tier 1 (to risk-weighted assets)	$ 50,502				$ 52,115				$ 50,502	$ 52,115
Actual Ratio Under RAP [Abstract]
Total capital (to risk-weighted assets) (as a percent)	13.302%				18.574%				13.302%	18.574%
Tier I capital (to risk-weighted assets) (in hundredths)	10.812%				17.129%				10.812%	17.129%
Tier I capital (to average assets, leverage) (as a percent)	8.488%				12.444%				8.488%	12.444%
Common equity Tier 1 (to risk-weighted assets) (in hundredths)	7.992%				9.366%				7.992%	9.366%
For capital adequacy purposes, amount [Abstract]
Total capital (to risk-weighted assets)	$ 54,503				$ 44,516				$ 54,503	$ 44,516
Tier I capital (to risk-weighted assets)	41,865				33,387				41,865	33,387
Tier I capital (to average assets, leverage)	32,199				30,638				32,199	30,638
Common equity Tier 1 (to risk-weighted assets)	$ 32,386				$ 25,040				$ 32,386	$ 25,040
For capital adequacy purposes, ratio [Abstract]
Total capital (to risk-weighted assets) (in hundredths)	8.625%				8.00%				8.625%	8.00%
Tier I capital (to risk-weighted assets) (in hundredths)	6.00%				6.00%				6.00%	6.00%
Tier I capital (to average assets, leverage) (in hundredths)	4.00%				4.00%				4.00%	4.00%
Common equity Tier 1 (to risk-weighted assets) (in hundredths)	4.50%				4.50%				4.50%	4.50%
To be well capitalized under prompt corrective action provision, amount [Abstract]
Total capital (to risk-weighted assets)	$ 63,192				$ 55,645				$ 63,192	$ 55,645
Tier I capital (to risk-weighted assets)	$ 37,915				$ 33,387				$ 37,915	$ 33,387
To be well capitalized under prompt corrective action provision, ratio [Abstract]
Total capital (to risk-weighted assets) (in hundredths)	10.00%				10.00%				10.00%	10.00%
Tier I capital (to risk-weighted assets) (in hundredths)	6.00%				6.00%				6.00%	6.00%
To be well capitalized under the Federal Reserve's regulations, amount
Total capital (to risk-weighted assets)	$ 63,192				$ 55,645				$ 63,192	$ 55,645
Tier I capital (to risk-weighted assets)	$ 37,915				$ 33,387				$ 37,915	$ 33,387
To be well capitalized under the Federal Reserve's regulations, ratio
Total capital (to risk-weighted assets) (in hundredths)	10.00%				10.00%				10.00%	10.00%
Tier I capital (to risk-weighted assets) (in hundredths)	6.00%				6.00%				6.00%	6.00%
Adjustments to net loss as well as the capital ratios [Abstract]
RAP net income									$ (8,831)	$ (9,020)
Tax lien adjustment, net of noncontrolling interest									1,544	1,973
Net income									$ 10,375	$ 10,993
Ratios As Adjusted Under RAP [Abstract]
Total capital (to risk-weighted assets) (in hundredths)	13.084%				18.277%				13.084%	18.277%
Tier I capital (to risk-weighted assets) (in hundredths)	10.512%				16.71%				10.512%	16.71%
Tier I capital (to average assets, leverage) (in hundredths)	8.248%				12.127%				8.248%	12.127%
Common equity Tier 1 (to risk-weighted assets) (in hundredths)	8.012%				9.04%				8.012%	9.04%