Premises and Equipment, Net - Premises and Equipment Less Accumulated Depreciation and Amortization (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 71,343	$ 69,778
Accumulated depreciation and amortization	(45,684)	(44,173)
Premises and equipment, net	25,659	25,605
Land
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	4,018	4,018
Buildings and improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	10,660	8,905
Capital leases
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	2,600	2,600
Furniture, fixtures, and equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	26,179	24,140
Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 27,886	$ 30,115