Business Combination and Intangible Assets (Narrative) (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares	Jan. 01, 2018 USD ($) $ / shares shares
Common stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01
Merger and acquisition costs	$ 3,625,000	$ 829,000
Amortization of core deposit intangible	$ 784,000
Estimated life	8 years
Goodwill	$ 10,835,000
Common Class A [Member]
Price per share | $ / shares			$ 38.78
County First Bank [Member]
Common stock, par value (in dollars per share) | $ / shares			$ 1.00
County First Acquisition [Member]
Business Acquisition Stock Conversion Per Common Stock			0.9543
Business Acquisition, Share Price | $ / shares			$ 2.20
Business Acquisition, Share Price, Cash Consideration | $ / shares			1.00
Business Acquisition, Share Price, Contingent Cash Consideration | $ / shares			$ 1.20
Business Acquisition, Aggregate Merger Consideration Of Company's Common Stock | shares			918,526
Payments to Acquire Businesses, Gross	2,122,000
Goodwill Above Estimate At Time Of Acquisition	558,236
Goodwill	10,835,000		$ 10,300,000
Business Combination, Consideration Transferred	$ 37,742,000