Basis of Presentation (Details)	Aug. 15, 2017 USD ($)	Jul. 05, 2017 shares	Sep. 30, 2017 USD ($) shares	May 08, 2017 USD ($) individual	Apr. 03, 2017 individual	Dec. 31, 2016 USD ($) shares
Basis of Presentation
Common stock, shares authorized | shares		50,000,000	50,000,000			50,000,000
Stock split, conversion ratio		2.5
Goodwill			$ 6,037,000			$ 523,000
Number of directors and senior executive officers of the Company that acquired JSB | individual					2
Stock Purchase Agreement
Basis of Presentation
Number of directors and senior executive officers of the Company that entered into a stock purchase agreement | individual				2
Purchase price				$ 5,400,000
Approximate cost of funds to be paid each 30 days after June 30, 2017 to the closing date				$ 16,403
Cost of funds (as a percent)				3.75%
RICHMAC
Basis of Presentation
Percentage of voting interests acquired	100.00%
Purchase price paid shares	$ 8,100,000
Goodwill	5,500,000
Intangibles	$ 1,600,000