Income Taxes (Details)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Statutory tax rate	21.00%	34.60%
Increase (decrease) resulting from:
Tax exempt interest	(4.50%)	(6.10%)
Tax exempt income on bank owned life insurance	(1.20%)	(1.50%)
Effective Income Tax Rate Reconciliation, Captive Insurance Premium Income, Percent	(0.60%)	0.00%
Other, net	0.40%	(0.20%)
Effective tax rate	15.10%	26.80%