Nature of Operations and Summary of Significant Accounting Policies (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) bankDivision	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) component operatingSegment bankDivision quarter	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Property, Plant and Equipment
Number of bank divisions | bankDivision	16		16
Number of operating segments | operatingSegment			1
Federal reserve balance or cash on hand required	$ 0		$ 0
Forecasting period used to determine ACL | quarter			4
Number of components used in methodology in determining ACL | component			2
Provision for credit loss loans	2,313,000	$ 2,869,000	$ (2,921,000)	$ 39,165,000
Provision for credit losses unfunded	(1,588,000)	2,317,000	(1,959,000)	2,135,000
Provision for credit losses	725,000	5,186,000	(4,880,000)	41,300,000
Provision for credit losses on debt securities	0	$ 0	$ 0	0
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			$ 45,789,000	$ 40,184,000
Impairment losses on receivables related to contracts with customers	$ 0		$ 0		$ 0
Minimum
Property, Plant and Equipment
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
Property, Plant and Equipment
Useful life of premises and equipment			15 years
Minimum | Furniture and Fixtures
Property, Plant and Equipment
Useful life of premises and equipment			3 years
Maximum
Property, Plant and Equipment
Period past due to consider loan as delinquent			89 days
Number of years for home equity loan origination term			15 years
Maximum | Building
Property, Plant and Equipment
Useful life of premises and equipment			40 years
Maximum | Furniture and Fixtures
Property, Plant and Equipment
Useful life of premises and equipment			10 years