Income Taxes Reconciliation of Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Anticipated income tax expense	$ 8,362	$ 5,684	$ 10,595
State income taxes, net of federal income tax benefit	112	101	46
Tax-exempt interest income, net of amortization	(900)	(1,026)	(1,298)
Tax Cuts and Jobs Act	0	0	(5,342)
Other, net	791	451	569
Provision for income taxes	$ 8,365	$ 5,210	$ 4,570
U.S. Federal statutory income tax rate	21.00%	21.00%	35.00%