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Loans and Allowance for Credit Losses on Loans - Allowance For Credit-Loan Losses (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2024
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Allowance for credit losses        
Balance, beginning of period $ 71,752,000 $ 71,752,000 $ 44,014,000 $ 44,014,000
Provision for loan losses   4,900,000 7,800,000  
FMBI's ACL for loans sold (593,000) (593,000)    
Provision for credit losses   5,477,000 7,817,000 37,488,000
Loans charged to the allowance   (925,000)   (9,791,000)
Recoveries of loans previously charged-off   1,000 7,000 41,000
Balance, end of period   75,712,000 51,838,000 71,752,000
ACL Loans        
Provision for credit losses   4,726,000 6,867,000  
Provision for credit losses, ACL Loans   4,900,000 7,800,000  
Provision for credit losses, ACL-OBCE's   (200,000) (900,000)  
Elimination of FMBI's ACL for loans sold 593,000 593,000    
Mortgage warehouse lines of credit        
Allowance for credit losses        
Balance, beginning of period 2,070,000 2,070,000 1,249,000 1,249,000
Provision for credit losses   952,000 415,000 821,000
Balance, end of period   3,022,000 1,664,000 2,070,000
Residential real estate        
Allowance for credit losses        
Balance, beginning of period 7,323,000 7,323,000 7,029,000 7,029,000
FMBI's ACL for loans sold   (55,000)    
Provision for credit losses   (363,000) 349,000 328,000
Loans charged to the allowance       (34,000)
Balance, end of period   6,905,000 7,378,000 7,323,000
ACL Loans        
Elimination of FMBI's ACL for loans sold   55,000    
Multi-family financing        
Allowance for credit losses        
Balance, beginning of period 26,874,000 26,874,000 16,781,000 16,781,000
FMBI's ACL for loans sold   (186,000)    
Provision for credit losses   1,976,000 3,070,000 18,493,000
Loans charged to the allowance       (8,400,000)
Balance, end of period   28,664,000 19,851,000 26,874,000
ACL Loans        
Elimination of FMBI's ACL for loans sold   186,000    
Healthcare financing        
Allowance for credit losses        
Balance, beginning of period 22,454,000 22,454,000 9,882,000 9,882,000
FMBI's ACL for loans sold   (2,000)    
Provision for credit losses   2,135,000 1,871,000 12,572,000
Balance, end of period   24,587,000 11,753,000 22,454,000
ACL Loans        
Elimination of FMBI's ACL for loans sold   2,000    
Commercial and commercial real estate        
Allowance for credit losses        
Balance, beginning of period 12,243,000 12,243,000 8,326,000 8,326,000
FMBI's ACL for loans sold   (92,000)    
Provision for credit losses   763,000 2,149,000 5,232,000
Loans charged to the allowance   (925,000)   (1,356,000)
Recoveries of loans previously charged-off   1,000 7,000 41,000
Balance, end of period   11,990,000 10,482,000 12,243,000
ACL Loans        
Elimination of FMBI's ACL for loans sold   92,000    
Agricultural production and real estate        
Allowance for credit losses        
Balance, beginning of period 619,000 619,000 565,000 565,000
FMBI's ACL for loans sold   (246,000)    
Provision for credit losses   77,000 (22,000) 54,000
Balance, end of period   450,000 543,000 619,000
ACL Loans        
Elimination of FMBI's ACL for loans sold   246,000    
Consumer and margin loans        
Allowance for credit losses        
Balance, beginning of period $ 169,000 169,000 182,000 182,000
FMBI's ACL for loans sold   (12,000)    
Provision for credit losses   (63,000) (15,000) (12,000)
Loans charged to the allowance       (1,000)
Balance, end of period   94,000 $ 167,000 $ 169,000
ACL Loans        
Elimination of FMBI's ACL for loans sold   $ 12,000