Regulatory Capital Requirements (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Capital actual amount under regulations [Abstract]
Total capital (to risk-weighted assets)	$ 91,246		$ 91,246
Tier I capital (to risk-weighted assets)	78,139		78,139
Tier I capital (to average assets, leverage)	78,139		78,139
Common equity Tier 1 (to risk-weighted assets)	$ 57,789		$ 57,789
Actual Ratio Under RAP [Abstract]
Total capital (to risk-weighted assets) (as a percent)	14.761%		14.761%
Tier I capital (to risk-weighted assets) (in hundredths)	12.64%		12.64%
Tier I capital (to average assets, leverage) (as a percent)	9.793%		9.793%
Common equity Tier 1 (to risk-weighted assets) (in hundredths)	9.348%		9.348%
For capital adequacy purposes, amount [Abstract]
Total capital (to risk-weighted assets)	$ 57,181		$ 57,181
Tier I capital (to risk-weighted assets)	44,817		44,817
Tier I capital (to average assets, leverage)	31,918		31,918
Common equity Tier 1 (to risk-weighted assets)	$ 35,545		$ 35,545
For capital adequacy purposes, ratio [Abstract]
Total capital (to risk-weighted assets) (in hundredths)	9.25%		9.25%
Tier I capital (to risk-weighted assets) (in hundredths)	7.25%		7.25%
Tier I capital (to average assets, leverage) (in hundredths)	4.00%		4.00%
Common equity Tier 1 (to risk-weighted assets) (in hundredths)	5.75%		5.75%
To be well capitalized under prompt corrective action provision, amount [Abstract]
Total capital (to risk-weighted assets)	$ 61,817		$ 61,817
Tier I capital (to risk-weighted assets)	$ 37,090		$ 37,090
To be well capitalized under prompt corrective action provision, ratio [Abstract]
Total capital (to risk-weighted assets) (in hundredths)	10.00%		10.00%
Tier I capital (to risk-weighted assets) (in hundredths)	6.00%		6.00%
To be well capitalized under the Federal Reserve's regulations, amount
Total capital (to risk-weighted assets)	$ 61,817		$ 61,817
Tier I capital (to risk-weighted assets)	$ 37,090		$ 37,090
To be well capitalized under the Federal Reserve's regulations, ratio
Total capital (to risk-weighted assets) (in hundredths)	10.00%		10.00%
Tier I capital (to risk-weighted assets) (in hundredths)	6.00%		6.00%
Capital conservation buffer (as a percentage)			1.25
Adjustments to net loss as well as the capital ratios [Abstract]
U.S. GAAP net income	$ 2,275	$ 2,030	$ 7,094	$ 6,253
Royal Bank
Capital actual amount under regulations [Abstract]
Total capital (to risk-weighted assets)	86,153		86,153
Tier I capital (to risk-weighted assets)	78,334		78,334
Tier I capital (to average assets, leverage)	78,334		78,334
Common equity Tier 1 (to risk-weighted assets)	$ 77,606		$ 77,606
Actual Ratio Under RAP [Abstract]
Total capital (to risk-weighted assets) (as a percent)	13.955%		13.955%
Tier I capital (to risk-weighted assets) (in hundredths)	12.689%		12.689%
Tier I capital (to average assets, leverage) (as a percent)	9.826%		9.826%
Common equity Tier 1 (to risk-weighted assets) (in hundredths)	12.571%		12.571%
For capital adequacy purposes, amount [Abstract]
Total capital (to risk-weighted assets)	$ 57,106		$ 57,106
Tier I capital (to risk-weighted assets)	44,759		44,759
Tier I capital (to average assets, leverage)	31,889		31,889
Common equity Tier 1 (to risk-weighted assets)	$ 35,498		$ 35,498
For capital adequacy purposes, ratio [Abstract]
Total capital (to risk-weighted assets) (in hundredths)	9.25%		9.25%
Tier I capital (to risk-weighted assets) (in hundredths)	7.25%		7.25%
Tier I capital (to average assets, leverage) (in hundredths)	4.00%		4.00%
Common equity Tier 1 (to risk-weighted assets) (in hundredths)	5.75%		5.75%
To be well capitalized under prompt corrective action provision, amount [Abstract]
Total capital (to risk-weighted assets)	$ 61,736		$ 61,736
Tier I capital (to risk-weighted assets)	49,389		49,389
Tier I capital (to average assets, leverage)	39,861		39,861
Common equity Tier 1 (to risk-weighted assets)	$ 40,128		$ 40,128
To be well capitalized under prompt corrective action provision, ratio [Abstract]
Total capital (to risk-weighted assets) (in hundredths)	10.00%		10.00%
Tier I capital (to risk-weighted assets) (in hundredths)	8.00%		8.00%
Tier I capital (to average assets, leverage) (in hundredths)	5.00%		5.00%
Common equity Tier 1 (to risk-weighted assets) (in hundredths)	6.50%		6.50%
To be well capitalized under the Federal Reserve's regulations, amount
Total capital (to risk-weighted assets)	$ 61,736		$ 61,736
Tier I capital (to risk-weighted assets)	$ 49,389		$ 49,389
To be well capitalized under the Federal Reserve's regulations, ratio
Total capital (to risk-weighted assets) (in hundredths)	10.00%		10.00%
Tier I capital (to risk-weighted assets) (in hundredths)	8.00%		8.00%