Income Tax - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Valuation Allowance [Line Items]
Increase in deferred tax assets	$ 1,584,000
Release of deferred tax asset	6,966,000	$ 2,849,000
Net Unrealized Loss on Securities Available for Sale	4,584,000
Decrease in deferred tax assets for federal and state net operating loss carryforwards	3,875,000
Decrease in deferred tax assets for loans	2,971,000
Deferred compensation	2,347,000
Additional paid-in capital	840,052,000	$ 834,870,000
Unrecorded deferred tax liability	5,308,000
CFS
Valuation Allowance [Line Items]
Additional paid-in capital	13,393,000
Ameriana
Valuation Allowance [Line Items]
Additional paid-in capital	11,883,000
State and Local Jurisdiction
Valuation Allowance [Line Items]
Release of deferred tax asset	6,966,000
State tax loss carryforward	31,183,000
State deferred tax assets	$ 3,767,000