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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	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023
Business Acquisition [Line Items]
Net interest income	$ 57,245	$ 171,635
Provision for credit losses	6,246	6,768
Non-interest income	25,205	73,892
Non-interest expense	60,741	166,430
Income before taxes	15,463	72,329
Income tax expense	3,830	17,069
Net income	$ 11,633	$ 55,260
Earnings per share
Basic	$ 0.52	$ 2.62
Diluted	$ 0.52	$ 2.61
Basic weighted average shares o/s	22,220,438	21,086,802
Diluted weighted average shares o/s	22,319,334	21,176,946

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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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