Premises and Equipment - Narrative (Details) - Land Acquisition - SPF15, Inc. $ in Millions		3 Months Ended
	Oct. 25, 2019 USD ($)	Mar. 31, 2019 USD ($) parcel	Dec. 31, 2018 a
Property, Plant and Equipment [Line Items]
Area of land			3.3
Payments to acquire land | $		$ 10.2
Number of additional parcels of land transferred | parcel		2
Proceeds from purchase price reimbursement | $	$ 11.1
Fishers Town Hall Building Corporation
Property, Plant and Equipment [Line Items]
Area of land			0.75
Third Parties
Property, Plant and Equipment [Line Items]
Area of land			1.65