Income Tax (Reconciliation of Income Tax Expense at Federal Statutory Rate to Actual Tax Expense) (Details) - USD ($) $ in Thousands		1 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 22, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of federal statutory to actual tax expense
Federal statutory income tax at 34%				$ 4,583	$ 6,496	$ 5,993
State taxes					145	145
Non tax captive insurance income				(245)	(310)	(319)
Low income housing credits				(134)	(96)	(96)
Tax-exempt income				(1,355)	(1,453)	(1,404)
Effect of "Tax Cuts and Jobs Act"					2,000
Other				111	11	67
Income Tax Expense (Benefit), Total				$ 2,960	$ 6,793	$ 4,386
Effective tax rate				13.56%	35.55%	24.88%
Federal statutory income tax rate	21.00%	34.00%	34.00%	21.00%	34.00%	34.00%