Income Tax - Reconciliation of Deferred Tax Assets & Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets
Allowance for loan losses	$ 13,966	$ 4,120
Net operating loss and tax credits (from acquisitions)	3	54
Director and employee benefits	2,035	1,890
Accrued pension	0	775
Other	3,139	2,145
Total assets	19,143	8,984
Liabilities
Depreciation	(4,374)	(4,456)
State tax	(315)	(10)
Federal Home Loan Bank stock dividends	(363)	(368)
Difference in basis of intangible assets	(2,921)	(3,427)
Fair value adjustment on acquisitions	(3,284)	(2,488)
Unrealized gain on AFS securities and fair value hedge	(7,404)	(1,710)
Other	(294)	(63)
Total liabilities	(18,955)	(12,522)
Net deferred tax asset/(liability)	$ 188
Net deferred tax asset/(liability)		$ (3,538)