Segment Information (Details) $ in Thousands		3 Months Ended
	Dec. 31, 2025 segment	Mar. 31, 2026 USD ($) segment	Mar. 31, 2025 USD ($) segment
Segment Reporting [Abstract]
Number of reportable segments | segment	1		2
Number of operating segments | segment		2
Segment Reporting Information [Line Items]
Interest income		$ 24,394	$ 23,458
Interest expense		7,292	8,164
Net interest income		17,102	15,294
Provision for (release of) credit losses		73	(340)
Operating expenses
Salaries and employee benefits		6,814	6,912
Occupancy, furniture and equipment expense		1,322	1,193
Processing, network, and bank card expense		1,418	1,401
Legal, examination, and professional fees		802	493
Depreciation		439	535
Other		2,208	1,965
Total operating expenses		13,003	12,499
Other
Non-interest income		3,101	3,463
Investment securities gains (losses), net		5	(2)
Income taxes		1,389	1,213
Net income		5,743	5,383
Segment assets		1,855,860	1,883,423
Non-Bank
Segment Reporting Information [Line Items]
Interest income		25	26
Interest expense		772	852
Net interest income		(747)	(826)
Provision for (release of) credit losses		0	0
Operating expenses
Salaries and employee benefits		244	359
Occupancy, furniture and equipment expense		(40)	0
Processing, network, and bank card expense		0	0
Legal, examination, and professional fees		155	97
Depreciation		0	0
Other		205	211
Total operating expenses		564	667
Other
Non-interest income		379	360
Investment securities gains (losses), net		0	0
Income taxes		(196)	(237)
Net income		(736)	(896)
Segment assets		13,060	12,138
Hawthorn Bank | Operating Segments
Segment Reporting Information [Line Items]
Interest income		24,369	23,432
Interest expense		6,520	7,312
Net interest income		17,849	16,120
Provision for (release of) credit losses		73	(340)
Operating expenses
Salaries and employee benefits		6,340	6,397
Occupancy, furniture and equipment expense		1,341	1,178
Processing, network, and bank card expense		1,365	1,383
Legal, examination, and professional fees		647	396
Depreciation		439	535
Other		1,974	1,739
Total operating expenses		12,106	11,628
Other
Non-interest income		2,106	2,591
Investment securities gains (losses), net		5	(2)
Income taxes		1,585	1,450
Net income		6,196	5,971
Segment assets		1,842,782	1,871,281
Wealth Management | Operating Segments
Segment Reporting Information [Line Items]
Interest income		0	0
Interest expense		0	0
Net interest income		0	0
Provision for (release of) credit losses		0	0
Operating expenses
Salaries and employee benefits		230	156
Occupancy, furniture and equipment expense		21	15
Processing, network, and bank card expense		53	18
Legal, examination, and professional fees		0	0
Depreciation		0	0
Other		29	15
Total operating expenses		333	204
Other
Non-interest income		616	512
Investment securities gains (losses), net		0	0
Income taxes		0	0
Net income		283	308
Segment assets		$ 18	$ 4