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Regulatory Matters (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Company    
Total Capital (to risk-weighted assets)    
Total Capital (to risk-weighted assets), Actual, Amount $ 1,858,348 $ 1,772,195
Total Capital (to risk weighted assets), Actual, Ratio (as a percent) 0.117 0.116
Total Capital (to risk weighted assets), Minimum Amount to be Well Capitalized with Basel III Buffer, Amount $ 1,662,302 $ 1,598,260
Total Capital (to risk weighted assets), Minimum Amount to be Well Capitalized with Basel III Buffer, Ratio (as a percent) 0.105 0.105
Tier I Capital (to risk-weighted assets)    
Tier I Capital, (to risk-weighted assets), Actual, Amount $ 1,768,553 $ 1,686,202
Tier I Capital (to risk weighted assets), Actual, Ratio (as a percent) 0.112 0.111
Tier I Capital (to risk weighted assets), Minimum Amount to be Well Capitalized with Basel III Buffer, Amount $ 1,345,673 $ 1,293,830
Tier I Capital (to risk weighted assets), Minimum Amount to be Well Capitalized with Basel III Buffer, Ratio (as a percent) 0.085 0.085
Common Equity Tier I Capital (to risk-weighted assets)    
Common Equity Tier I Capital (to risk weighted assets), Actual, Amount $ 1,268,945 $ 1,186,594
Common Equity Tier I Capital (to risk weighted assets), Ratio (as a percent) 0.080 0.078
Common Equity Tier I Capital (to risk weighted assets), Minimum Amount to be Well Capitalized with Basel III Buffer, Amount $ 1,108,202 $ 1,065,507
Common Equity Tier I Capital (to risk weighted assets, Minimum Amount Required to be Well Capitalized with Basel III Buffer, Ratio (as a percent) 0.070 0.070
Tier 1 Capital (to average assets)    
Tier 1 Capital (to average assets), Actual, Amount $ 1,768,553 $ 1,686,202
Tier 1 Capital (to average assets), Actual, Ratio (as a percent) 0.105 0.101
Tier 1 Capital (to average assets), Minimum Amount Required to be Well Capitalized with Basel III Buffer, Amount $ 839,199 $ 832,706
Tier 1 Capital (to average assets), Minimum Amount Required to be Well Capitalized with Basel III Buffer, Ratio (as a percent) 0.050 0.050
Merchants Bank    
Total Capital (to risk-weighted assets)    
Total Capital (to risk-weighted assets), Actual, Amount $ 1,801,020 $ 1,724,505
Total Capital (to risk weighted assets), Actual, Ratio (as a percent) 0.114 0.115
Total Capital (to risk weighted assets), Minimum Amount to be Well Capitalized with Basel III Buffer, Amount $ 1,660,561 $ 1,577,434
Total Capital (to risk weighted assets), Minimum Amount to be Well Capitalized with Basel III Buffer, Ratio (as a percent) 0.105 0.105
Total Capital (to risk weighted assets), Minimum Amount To Be Well Capitalized, Amount $ 1,581,487 $ 1,502,318
Total Capital (to risk weighted assets), Minimum Amount To Be Well Capitalized, Ratio (as a percent) 0.100 0.100
Tier I Capital (to risk-weighted assets)    
Tier I Capital, (to risk-weighted assets), Actual, Amount $ 1,711,225 $ 1,639,171
Tier I Capital (to risk weighted assets), Actual, Ratio (as a percent) 0.108 0.109
Tier I Capital (to risk weighted assets), Minimum Amount to be Well Capitalized with Basel III Buffer, Amount $ 1,344,264 $ 1,276,970
Tier I Capital (to risk weighted assets), Minimum Amount to be Well Capitalized with Basel III Buffer, Ratio (as a percent) 0.085 0.085
Tier I Capital (to risk weighted assets), Minimum Amount To Be Well Capitalized, Amount $ 1,265,189 $ 1,201,854
Tier I Capital (to risk weighted assets), Minimum Amount To Be Well Capitalized, Ratio (as a percent) 0.080 0.080
Common Equity Tier I Capital (to risk-weighted assets)    
Common Equity Tier I Capital (to risk weighted assets), Actual, Amount $ 1,711,225 $ 1,639,171
Common Equity Tier I Capital (to risk weighted assets), Ratio (as a percent) 0.108 0.109
Common Equity Tier I Capital (to risk weighted assets), Minimum Amount to be Well Capitalized with Basel III Buffer, Amount $ 1,107,041 $ 1,051,623
Common Equity Tier I Capital (to risk weighted assets, Minimum Amount Required to be Well Capitalized with Basel III Buffer, Ratio (as a percent) 0.070 0.070
Common Equity Tier I Capital (to risk weighted assets), Minimum Amount To Be Well Capitalized, Amount $ 1,027,966 $ 976,507
Common Equity Tier I Capital (to risk weighted assets), Minimum Amount To Be Well Capitalized, Ratio (as a percent) 0.065 0.065
Tier 1 Capital (to average assets)    
Tier 1 Capital (to average assets), Actual, Amount $ 1,711,225 $ 1,639,171
Tier 1 Capital (to average assets), Actual, Ratio (as a percent) 0.102 0.101
Tier 1 Capital (to average assets), Minimum Amount Required to be Well Capitalized with Basel III Buffer, Amount $ 837,560 $ 815,191
Tier 1 Capital (to average assets), Minimum Amount Required to be Well Capitalized with Basel III Buffer, Ratio (as a percent) 0.050 0.050
Tier 1 Capital (to average assets), Minimum Amount To Be Well Capitalized, Amount $ 837,560 $ 815,191
Tier 1 Capital (to average assets), Minimum Amount To Be Well Capitalized, Ratio (as a percent) 0.050 0.050
FMBI    
Total Capital (to risk-weighted assets)    
Total Capital (to risk-weighted assets), Actual, Amount   $ 40,613
Total Capital (to risk weighted assets), Actual, Ratio (as a percent)   0.211
Total Capital (to risk weighted assets), Minimum Amount to be Well Capitalized with Basel III Buffer, Amount   $ 20,209
Total Capital (to risk weighted assets), Minimum Amount to be Well Capitalized with Basel III Buffer, Ratio (as a percent)   0.105
Total Capital (to risk weighted assets), Minimum Amount To Be Well Capitalized, Amount   $ 19,247
Total Capital (to risk weighted assets), Minimum Amount To Be Well Capitalized, Ratio (as a percent)   0.100
Tier I Capital (to risk-weighted assets)    
Tier I Capital, (to risk-weighted assets), Actual, Amount   $ 39,953
Tier I Capital (to risk weighted assets), Actual, Ratio (as a percent)   0.208
Tier I Capital (to risk weighted assets), Minimum Amount to be Well Capitalized with Basel III Buffer, Amount   $ 16,360
Tier I Capital (to risk weighted assets), Minimum Amount to be Well Capitalized with Basel III Buffer, Ratio (as a percent)   0.085
Tier I Capital (to risk weighted assets), Minimum Amount To Be Well Capitalized, Amount   $ 15,398
Tier I Capital (to risk weighted assets), Minimum Amount To Be Well Capitalized, Ratio (as a percent)   0.080
Common Equity Tier I Capital (to risk-weighted assets)    
Common Equity Tier I Capital (to risk weighted assets), Actual, Amount   $ 39,953
Common Equity Tier I Capital (to risk weighted assets), Ratio (as a percent)   0.208
Common Equity Tier I Capital (to risk weighted assets), Minimum Amount to be Well Capitalized with Basel III Buffer, Amount   $ 13,473
Common Equity Tier I Capital (to risk weighted assets, Minimum Amount Required to be Well Capitalized with Basel III Buffer, Ratio (as a percent)   0.070
Common Equity Tier I Capital (to risk weighted assets), Minimum Amount To Be Well Capitalized, Amount   $ 12,511
Common Equity Tier I Capital (to risk weighted assets), Minimum Amount To Be Well Capitalized, Ratio (as a percent)   0.065
Tier 1 Capital (to average assets)    
Tier 1 Capital (to average assets), Actual, Amount   $ 39,953
Tier 1 Capital (to average assets), Actual, Ratio (as a percent)   0.115
Tier 1 Capital (to average assets), Minimum Amount Required to be Well Capitalized with Basel III Buffer, Amount   $ 17,391
Tier 1 Capital (to average assets), Minimum Amount Required to be Well Capitalized with Basel III Buffer, Ratio (as a percent)   0.050
Tier 1 Capital (to average assets), Minimum Amount To Be Well Capitalized, Amount   $ 17,391
Tier 1 Capital (to average assets), Minimum Amount To Be Well Capitalized, Ratio (as a percent)   0.050