Basis of Accounting and Consolidation - Additional Information (Details) - USD ($)		3 Months Ended
	Mar. 20, 2023	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Summary Of Significant Accounting Policies [Line Items]
Common stock, par value (in dollars per share)		$ 4		$ 4
Stock plans, term		10 years
Maximum number of shares to be issued in stock incentive plan (in shares)		399,983
Employee discount for employee stock purchase plan		15.00%
Employee stock purchase plan, number of shares authorized		600,000
Stock issued during period, shares, employee stock purchase plans		8,612	7,963
Captive maximum gross premiums		$ 2,800,000
Employee Stock Option
Summary Of Significant Accounting Policies [Line Items]
Common stock awarded in SI plan (in shares)		0
Restricted Stock
Summary Of Significant Accounting Policies [Line Items]
Common stock awarded in SI plan (in shares)		53,766	60,550
Restricted Stock Units (RSUs)
Summary Of Significant Accounting Policies [Line Items]
Common stock awarded in SI plan (in shares)		39,150	37,900
Blackhawk Bancorp, Inc
Summary Of Significant Accounting Policies [Line Items]
Percentage of issued and outstanding shares acquired	100.00%
Common stock, par value (in dollars per share)	$ 0.01
Conversion of common stock	1.15
Share Price	$ 4
Consideration payable in cash	$ 1,928
Consideration payable in shares	3,290,222
Common stock consideration value	$ 93,508,000