Nature of Operations and Summary of Significant Accounting Policies (Details)	3 Months Ended
	Mar. 31, 2021 USD ($) bankDivision component quarter operating_segment	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Number of bank divisions | bankDivision	16
Number of operating segments | operating_segment	1
Federal reserve balance or cash on hand required	$ 0
Forecasting period used to determine ACL | quarter	4
Number of components used in methodology in determining ACL | component	2
Provision for loan and lease losses	$ 489,000	$ 22,744,000
Provision for credit exposures	$ 441,000	3,559,000
Maximum term leases will be considered short-term	12 months
Maximum period up to which purchase price of business is allocated to assets acquired and liabilities assumed	1 year
Revenue from contracts with customers	$ 13,695,000	$ 14,458,000
Impairment losses on receivables related to contracts with customers	$ 0		$ 0
Minimum
Period past due to consider loan as delinquent	30 days
Period past due to consider loan as non accrual	90 days
Period past due to consider loan as purchased credit-deteriorated loan	90 days
Number of days delinquent to charge off loans	120 days
Number of years for home equity loan origination term	10 years
Minimum | Building
Useful life of premises and equipment	15 years
Minimum | Furniture and Fixtures
Useful life of premises and equipment	3 years
Maximum
Period past due to consider loan as delinquent	89 days
Number of years for home equity loan origination term	15 years
Maximum | Building
Useful life of premises and equipment	40 years
Maximum | Furniture and Fixtures
Useful life of premises and equipment	10 years