Premises and Equipment, Net - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 3,600,000	$ 3,000,000.0	$ 3,200,000
Sales of premises and equipment	0	$ 0	$ 0
Leasehold improvements
Property, Plant and Equipment [Line Items]
Impairment on finite-lived intangible assets	$ 470,000