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Other Borrowings - Summary of Terms of Outstanding Junior Subordinated Debentures (Details) - Trust Preferred Securities - Junior Subordinated Debentures
 9 Months Ended
Sep. 30, 2025
USD ($)
Debt Instrument [Line Items]  
Issuance Amount $ 198,499,000
Bridgeview Statutory Trust I  
Debt Instrument [Line Items]  
Issuance Amount $ 15,464,000
Variable rate 3.58%
Rate 8.15%
Bridgeview Capital Trust II  
Debt Instrument [Line Items]  
Issuance Amount $ 15,464,000
Variable rate 3.35%
Rate 7.93%
First Midwest Capital Trust I  
Debt Instrument [Line Items]  
Issuance Amount $ 37,825,000
Rate 6.95%
Fixed rates 6.95%
St. Joseph Capital Trust II  
Debt Instrument [Line Items]  
Issuance Amount $ 5,155,000
Variable rate 1.75%
Rate 6.03%
Northern States Statutory Trust I  
Debt Instrument [Line Items]  
Issuance Amount $ 10,310,000
Variable rate 1.80%
Rate 6.10%
Anchor Capital Trust III  
Debt Instrument [Line Items]  
Issuance Amount $ 5,000,000
Variable rate 1.55%
Rate 5.81%
Great Lakes Statutory Trust II  
Debt Instrument [Line Items]  
Issuance Amount $ 6,186,000
Variable rate 1.40%
Rate 5.70%
Bremer Statutory Trust II  
Debt Instrument [Line Items]  
Issuance Amount $ 61,856,000
Variable rate 1.60%
Rate 6.03%
Home Federal Statutory    Trust I  
Debt Instrument [Line Items]  
Issuance Amount $ 15,464,000
Variable rate 1.65%
Rate 5.95%
Monroe Bancorp Capital    Trust I  
Debt Instrument [Line Items]  
Issuance Amount $ 3,093,000
Variable rate 1.60%
Rate 6.18%
Tower Capital Trust 3  
Debt Instrument [Line Items]  
Issuance Amount $ 9,279,000
Variable rate 1.69%
Rate 6.12%
Monroe Bancorp Statutory    Trust II  
Debt Instrument [Line Items]  
Issuance Amount $ 5,155,000
Variable rate 1.60%
Rate 5.90%
Great Lakes Statutory Trust III  
Debt Instrument [Line Items]  
Issuance Amount $ 8,248,000
Variable rate 1.70%
Rate 6.00%