Premises and Equipment - Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Finance lease cost
Amortization of ROU assets	$ 235	$ 101
Interest on lease liabilities	159	34
Operating lease cost	4,807	4,063
Short-term lease cost	331	431
Variable lease cost	1,270	896
Sublease income	(12)	(6)
Total lease expense	$ 6,790	$ 5,519

Amount of interest expense on finance lease liability.

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-Name Accounting Standards Codification
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-Section 50
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Amount of amortization expense attributable to right-of-use asset from finance lease.

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- Definition

Amount of lease cost recognized by lessee for lease contract.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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Amount of sublease income excluding finance and operating lease expense.

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Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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