Income Taxes Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory Federal Tax Rate	21.00%	21.00%	35.00%
Tax Cuts and Jobs Act impact on deferred remeasurement	0.000	0.000	(0.028)
Tax-Exempt Income	(2.70%)	(3.10%)	(6.40%)
Nondeductible Interest Expense	0.20%	0.10%	0.10%
State Taxes, Net of Federal Income Tax Benefit	2.30%	2.40%	1.80%
Tax benefit from stock based compensation	(0.30%)	(0.40%)	(0.30%)
Other Items, Net	(0.10%)	(0.10%)	(1.00%)
Effective Tax Rate	20.40%	19.90%	26.40%