Other Real Estate Owned (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Real Estate Acquired Through Foreclosure [Roll Forward]
Beginning balance	$ 21,100,000	$ 11,000,000.0	$ 14,400,000	$ 10,100,000
OREO acquired through acquisition	2,400,000	0	2,400,000	0
Additions	4,900,000	6,300,000	13,300,000	7,400,000
Valuation adjustments	(100,000)	0	(400,000)	0
Dispositions	(700,000)	(2,400,000)	(2,100,000)	(2,600,000)
Ending balance	27,600,000	$ 14,900,000	27,600,000	$ 14,900,000
Carrying values of foreclosed residential real estate properties	3,500,000		3,500,000		$ 2,000,000.0
Consumer mortgage loans collateralized by residential real estate property in the process of foreclosure	$ 900,000		$ 900,000		$ 400,000