Regulatory Capital and Dividends (Tables)

12 Months Ended

Dec. 31, 2020

Banking and Thrift, Interest [Abstract]

Schedule of Actual and Required Capital Amounts and Ratios

					Prompt Corrective Action Thresholds
	Actual				Basel III Minimum Capital Required				Well Capitalized
December 31, 2020	Amount		Ratio		Amount		Ratio		Amount		Ratio
Total risk-based capital to risk-weighted assets
First Merchants Corporation	$	1,475,551	14.36	%	$	1,079,015	10.50	%	N/A		N/A
First Merchants Bank	1,412,805		13.70		1,082,430		10.50		$	1,030,886	10.00	%
Tier 1 capital to risk-weighted assets
First Merchants Corporation	$	1,282,070	12.48	%	$	873,488	8.50	%	N/A		N/A
First Merchants Bank	1,283,922		12.45		876,253		8.50		$	824,708	8.00	%
Common equity tier 1 capital to risk-weighted assets
First Merchants Corporation	$	1,235,702	12.02	%	$	719,343	7.00	%	N/A		N/A
First Merchants Bank	1,283,922		12.45		721,620		7.00		$	670,076	6.50	%
Tier 1 capital to average assets
First Merchants Corporation	$	1,282,070	9.57	%	$	536,123	4.00	%	N/A		N/A
First Merchants Bank	1,283,922		9.59		535,279		4.00		$	669,098	5.00	%
					Prompt Corrective Action Thresholds
	Actual				Basel III Minimum Capital Required				Well Capitalized
December 31, 2019	Amount		Ratio		Amount		Ratio		Amount		Ratio
Total risk-based capital to risk-weighted assets
First Merchants Corporation	$	1,400,617	14.29	%	$	1,028,930	10.50	%	N/A		N/A
First Merchants Bank	1,267,649		12.87		1,033,926		10.50		$	984,691	10.00	%
Tier 1 capital to risk-weighted assets
First Merchants Corporation	$	1,255,333	12.81	%	$	832,943	8.50	%	N/A		N/A
First Merchants Bank	1,187,365		12.06		836,988		8.50		$	787,753	8.00	%
Common equity tier 1 capital to risk-weighted assets
First Merchants Corporation	$	1,188,970	12.13	%	$	685,953	7.00	%	N/A		N/A
First Merchants Bank	1,187,365		12.06		689,284		7.00		$	640,049	6.50	%
Tier 1 capital to average assets
First Merchants Corporation	$	1,255,333	10.54	%	$	476,383	4.00	%	N/A		N/A
First Merchants Bank	1,187,365		9.99		475,564		4.00		$	594,455	5.00	%