Leases - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) Lease	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Lessor Lease Description [Line Items]
Direct financing lease, interest income	$ 991	$ 401	$ 55
Premises and equipment, net	279,099	262,524
Premises and equipment, gross	325,429	289,630
Premises and equipment, accumulated depreciation	46,330	27,106
Premises and equipment, depreciation expense	19,300	16,000	9,600
Lease income	$ 9,400	8,000	1,900
Lessee, operating lease, number of leases on which options to extend lease term will certainly be exercised | Lease	1
Finance lease, remaining lease term	2 years 11 months 1 day
Total operating lease rent expense		1,200	848
Minimum
Lessor Lease Description [Line Items]
Operating lease, remaining lease term	1 year
Maximum
Lessor Lease Description [Line Items]
Operating lease, remaining lease term	27 years
Lessee, operating lease, renewal term	20 years
Premises and Equipment Subject to Operating Leases
Lessor Lease Description [Line Items]
Premises and equipment, net	$ 144,300	148,800
Premises and equipment, gross	164,300	159,200
Premises and equipment, accumulated depreciation	20,000	10,400
Premises and equipment, depreciation expense	$ 9,700	$ 8,200	$ 2,200