Note 14 - Regulatory Matters (Tables)

6 Months Ended

Jun. 30, 2026

Notes Tables

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]

																		Minimum Required
																		to be Well
										Minimum Required								Capitalized Under
										for Capital								Prompt Corrective
		Actual								Adequacy Purposes								Action Regulations
(Dollars in thousands)		Amount				Ratio				Amount				Ratio				Amount				Ratio
June 30, 2026
Total capital (to risk weighted assets)
Consolidated		$	896,267				14.7	%		$	489,330				8.0	%		$ NA				NA%
Mercantile Bank			784,315				13.5				463,237				8.0				579,046				10.0
Eastern Michigan Bank			64,163				23.1				22,272				8.0				27,839				10.0
Tier 1 capital (to risk weighted assets)
Consolidated			749,048				12.3				366,997				6.0			NA				NA
Mercantile Bank			729,188				12.6				347,428				6.0				463,237				8.0
Eastern Michigan Bank			61,900				22.2				16,704				6.0				22,272				8.0
Common equity tier 1 (to risk weighted assets)
Consolidated			699,764				11.4				275,248				4.5			NA				NA
Mercantile Bank			729,188				12.6				260,571				4.5				376,380				6.5
Eastern Michigan Bank			61,900				22.2				12,528				4.5				18,096				6.5
Tier 1 capital (to average assets)
Consolidated			749,048				11.0				271,356				4.0			NA				NA
Mercantile Bank			729,188				11.6				250,594				4.0				313,243				5.0
Eastern Michigan Bank			61,900				12.0				20,657				4.0				25,821				5.0

December 31, 2025
Total capital (to risk weighted assets)
Consolidated		$	859,158				14.4	%		$	477,044				8.0	%		$ NA				NA%
Mercantile Bank			775,664				13.8				449,498				8.0				561,873				10.0
Eastern Michigan Bank			58,893				20.2				23,335				8.0				29,168				10.0
Tier 1 capital (to risk weighted assets)
Consolidated			709,058				11.9				357,783				6.0			NA				NA
Mercantile Bank			717,619				12.8				337,124				6.0				449,498				8.0
Eastern Michigan Bank			56,495				19.4				17,501				6.0				23,335				8.0
Common equity tier 1 (to risk weighted assets)
Consolidated			660,117				11.1				268,337				4.5			NA				NA
Mercantile Bank			717,619				12.8				252,843				4.5				365,217				6.5
Eastern Michigan Bank			56,495				19.4				13,126				4.5				18,960				6.5
Tier 1 capital (to average assets)
Consolidated			709,058				11.4				249,580				4.0			NA				NA
Mercantile Bank			717,619				11.5				248,738				4.0				310,922				5.0
Eastern Michigan Bank			56,495				11.5				19,621				4.0				24,527				5.0