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Business Combinations - Unaudited Pro Forma Condensed Combined Financial Information (Details) - Blackhawk Bancorp, Inc - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023
Business Acquisition [Line Items]
Net interest income	$ 42,367	$ 56,502
Provision for credit losses	458	924
Non-interest income	19,486	23,024
Non-interest expense	40,042	53,785
Income before taxes	21,353	24,817
Income tax expense	4,786	5,641
Net income	$ 16,567	$ 19,176
Earnings per share
Basic	$ 0.81	$ 0.81
Diluted	$ 0.8	$ 0.8
Basic weighted average shares o/s	20,528,717	23,818,939
Diluted weighted average shares o/s	20,628,239	23,918,461

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
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-Name Accounting Standards Codification
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