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Regulatory Capital (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Phantom section (for regulatory ratios):
Capital ($)	$ 444,305	$ 412,879
Capital to RWA (%)	15.74%	13.63%
Capital Required for Capital Adequacy ($)	$ 296,378	$ 299,148
Capital Required for Capital Adequacy to RWA (%)	10.50%	9.875%
Tier One Risk Based Capital ($)	$ 417,394	$ 386,690
Tier One Risk Based Capital to RWA (%)	14.79%	12.76%
Tier One Risk Based Capital Required for Capital Adequacy ($)	$ 239,925	$ 238,561
Tier One Risk Based Capital Required for Capital Adequacy to RWA (%)	8.50%	7.875%
Common Equity Tier One Risk Based Capital ($)	$ 398,536	$ 357,690
Common Equity Tier One Risk Based Capital To RWA (%)	14.12%	11.81%
Common Equity Tier One Risk Based Capital Required For Capital Adequacy ($)	$ 197,585	$ 193,121
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to RWA (%)	7.00%	6.375%
Tier One Leverage Capital to Average Assets (%)	11.20%	11.15%
Tier One Leverage Capital Required for Capital Adequacy ($)	$ 149,044	$ 138,765
Tier One Leverage Capital Required for Capital Adequacy to Average Assets (%)	4.00%	4.00%
Description of Regulatory Requirements, Capital Adequacy Purposes	Quantitative measures established by each regulatory capital standards to ensure capital adequacy require the Company and its subsidiary bank to maintain a minimum capital amounts and ratios (set forth in the table below).
First Clover Leaf [Member]
Phantom section (for regulatory ratios):
Capital ($)		$ 45,387
Capital to RWA (%)		14.33%
Capital Required for Capital Adequacy ($)		$ 31,283
Capital Required for Capital Adequacy to RWA (%)		9.875%
Capital Required to be Well Capitalized ($)		$ 31,679
Capital Required to be Well Capitalized to RWA (%)		10.00%
Tier One Risk Based Capital ($)		$ 45,387
Tier One Risk Based Capital to RWA (%)		14.33%
Tier One Risk Based Capital Required for Capital Adequacy ($)		$ 24,947
Tier One Risk Based Capital Required for Capital Adequacy to RWA (%)		7.875%
Tier One Risk Based Capital Required to be Well Capitalized ($)		$ 25,343
Tier One Risk Based Capital Required to be Well Capitalized to RWA (%)		8.00%
Common Equity Tier One Risk Based Capital ($)		$ 45,387
Common Equity Tier One Risk Based Capital To RWA (%)		14.33%
Common Equity Tier One Risk Based Capital Required For Capital Adequacy ($)		$ 20,195
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to RWA (%)		6.375%
Common Equity Tier One Risk Based Capital Required to Be Well Capitalized ($)		$ 20,591
Common Equity Tier One Risk Based Capital Required To Be Well Capitalized to RiWA (%)		6.50%
Tier One Leverage Capital to Average Assets (%)		11.12%
Tier One Leverage Capital Required for Capital Adequacy ($)		$ 16,322
Tier One Leverage Capital Required for Capital Adequacy to Average Assets (%)		4.00%
Tier One Leverage Capital Required to be Well Capitalized ($)		$ 20,403
Tier One Leverage Capital Required to be Well Capitalized to Average Assets (%)		5.00%
First Mid Bank [Member]
Phantom section (for regulatory ratios):
Capital ($)	$ 411,196	$ 350,361
Capital to RWA (%)	14.65%	12.85%
Capital Required for Capital Adequacy ($)	$ 294,703	$ 269,171
Capital Required for Capital Adequacy to RWA (%)	10.50%	9.875%
Capital Required to be Well Capitalized ($)	$ 280,670	$ 272,578
Capital Required to be Well Capitalized to RWA (%)	10.00%	10.00%
Tier One Risk Based Capital ($)	$ 384,285	$ 324,172
Tier One Risk Based Capital to RWA (%)	13.69%	11.89%
Tier One Risk Based Capital Required for Capital Adequacy ($)	$ 238,569	$ 214,655
Tier One Risk Based Capital Required for Capital Adequacy to RWA (%)	8.50%	7.875%
Tier One Risk Based Capital Required to be Well Capitalized ($)	$ 224,536	$ 218,063
Tier One Risk Based Capital Required to be Well Capitalized to RWA (%)	8.00%	8.00%
Common Equity Tier One Risk Based Capital ($)	$ 384,285	$ 324,172
Common Equity Tier One Risk Based Capital To RWA (%)	13.69%	11.89%
Common Equity Tier One Risk Based Capital Required For Capital Adequacy ($)	$ 196,469	$ 173,769
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to RWA (%)	7.00%	6.375%
Common Equity Tier One Risk Based Capital Required to Be Well Capitalized ($)	$ 182,435	$ 177,176
Common Equity Tier One Risk Based Capital Required To Be Well Capitalized to RiWA (%)	6.50%	6.50%
Tier One Leverage Capital to Average Assets (%)	10.37%	9.92%
Tier One Leverage Capital Required for Capital Adequacy ($)	$ 148,268	$ 130,716
Tier One Leverage Capital Required for Capital Adequacy to Average Assets (%)	4.00%	4.00%
Tier One Leverage Capital Required to be Well Capitalized ($)	$ 185,335	$ 163,396
Tier One Leverage Capital Required to be Well Capitalized to Average Assets (%)	5.00%	5.00%

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