Income Taxes Schedule of income tax rate reconciliation (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	35.00%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent	2.00%	1.80%	2.80%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Life Insurance, Percent	0.80%	1.10%	1.40%
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent	1.50%	1.30%	1.90%
Effective Income Tax Rate Reconciliation, Deduction, Employee Stock Ownership Plan Dividend, Percent	0.60%	0.60%	1.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	0.00%	0.00%	1.00%
Effective Income Tax Rate Reconciliation, Disposition of Asset, Percent	0.00%	(0.60%)	0.00%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	(1.60%)	(0.30%)	0.00%
Effective Income Tax Rate Reconciliation, Percent	17.70%	15.90%	28.90%