Business Combination - Additional Information (Details)		12 Months Ended
	Oct. 31, 2019 USD ($) Location shares	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Cash payments for acquisition		$ 6,110,000
Goodwill, nondeductible for tax purposes		$ 27,817,000	$ 27,817,000	$ 18,293,000	$ 9,410,000
Trinity Bancorp, Inc.
Business Acquisition [Line Items]
Number of banking locations | Location	3
Outstanding common stock exchanged for shares of company common stock | shares	0.44627
Cash received in exchange of each share	$ 3.50
Cash payments for acquisition	$ 6,111,000
Stock issued for acquisition | shares	779,034
Aggregate estimated value of the consideration	$ 27,145,000
Goodwill, nondeductible for tax purposes	9,524,000
Merger expenses	$ 1,420,000
Period in which fair values are subject to refinement	1 year
Trinity Bancorp, Inc. | Core Deposits
Business Acquisition [Line Items]
Intangible assets amortization period	10 years