Income Taxes Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Computed Tax Expense at Statutory Rate	$ 9,514	$ 13,949	$ 13,212
Tax Cuts and Jobs Act impact on deferred remeasurement	0	(1,116)	0
Tax-Exempt Income	(1,407)	(2,537)	(2,437)
Nondeductible Interest Expense	50	52	40
State Taxes, Net of Federal Income Tax Benefit	1,093	698	554
Tax benefit from stock based compensation	(175)	(134)	0
Other Items, Net	(49)	(383)	(154)
Income Tax Expense (Benefit), Continuing Operations	$ 9,026	$ 10,529	$ 11,215