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Borrowed Funds - Summary of Outstanding Trust Preferred Securities (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Amount Outstanding $ 471,331 $ 385,292
Trust Preferred Securities [Member]    
Debt Instrument [Line Items]    
Amount Outstanding 218,929 $ 76,782
Trust Preferred Securities [Member] | Marquette Capital Trust I [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 19,205  
Issuance Date Dec. 28, 2005  
Interest Rate 1.33% over 3-month term SOFR  
Interest Rate as of September 30, 2025 5.91%  
Maturity Date Jan. 07, 2036  
Trust Preferred Securities [Member] | Marquette Capital Trust II [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 19,687  
Issuance Date Dec. 28, 2005  
Interest Rate 1.33% over 3-month term SOFR  
Interest Rate as of September 30, 2025 5.91%  
Maturity Date Jan. 07, 2036  
Trust Preferred Securities [Member] | Marquette Capital Trust III [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 7,730  
Issuance Date May 30, 2006  
Interest Rate 1.50% over 3-month term SOFR  
Interest Rate as of September 30, 2025 5.77%  
Maturity Date Jun. 23, 2036  
Trust Preferred Securities [Member] | Marquette Capital Trust IV [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 31,184  
Issuance Date Jun. 30, 2006  
Interest Rate 1.60% over 3-month term SOFR  
Interest Rate as of September 30, 2025 5.90%  
Maturity Date Sep. 15, 2036  
Trust Preferred Securities [Member] | Heartland Financial Statutory Trust IV [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 9,622  
Issuance Date Mar. 17, 2004  
Interest Rate 2.75% over 3-month term SOFR  
Interest Rate as of September 30, 2025 7.03%  
Maturity Date Mar. 17, 2034  
Trust Preferred Securities [Member] | Heartland Financial Statutory Trust V [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 17,361  
Issuance Date Jan. 27, 2006  
Interest Rate 1.33% over 3-month term SOFR  
Interest Rate as of September 30, 2025 5.91%  
Maturity Date Apr. 07, 2036  
Trust Preferred Securities [Member] | Heartland Financial Statutory Trust VI [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 16,848  
Issuance Date Jun. 21, 2007  
Interest Rate 1.48% over 3-month term SOFR  
Interest Rate as of September 30, 2025 5.78%  
Maturity Date Sep. 15, 2037  
Trust Preferred Securities [Member] | Heartland Financial Statutory Trust VII [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 14,742  
Issuance Date Jun. 26, 2007  
Interest Rate 1.48% over 3-month term SOFR  
Interest Rate as of September 30, 2025 5.91%  
Maturity Date Sep. 01, 2037  
Trust Preferred Securities [Member] | Morrill Statutory Trust I [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 9,931  
Issuance Date Dec. 19, 2002  
Interest Rate 3.25% over 3-month term SOFR  
Interest Rate as of September 30, 2025 7.51%  
Maturity Date Dec. 26, 2032  
Trust Preferred Securities [Member] | Morrill Statutory Trust II [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 9,687  
Issuance Date Dec. 17, 2003  
Interest Rate 2.85% over 3-month term SOFR  
Interest Rate as of September 30, 2025 7.13%  
Maturity Date Dec. 17, 2033  
Trust Preferred Securities [Member] | Sheboygan Statutory Trust I [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 7,314  
Issuance Date Sep. 17, 2003  
Interest Rate 2.95% over 3-month term SOFR  
Interest Rate as of September 30, 2025 7.23%  
Maturity Date Sep. 17, 2033  
Trust Preferred Securities [Member] | CBNM Capital Trust I [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 4,833  
Issuance Date Sep. 10, 2004  
Interest Rate 3.25% over 3-month term SOFR  
Interest Rate as of September 30, 2025 7.55%  
Maturity Date Dec. 15, 2034  
Trust Preferred Securities [Member] | Citywide Capital Trust III [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 6,769  
Issuance Date Dec. 19, 2003  
Interest Rate 2.80% over 3-month term SOFR  
Interest Rate as of September 30, 2025 7.37%  
Maturity Date Dec. 19, 2033  
Trust Preferred Securities [Member] | Citywide Capital Trust IV [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 4,668  
Issuance Date Sep. 30, 2004  
Interest Rate 2.20% over 3-month term SOFR  
Interest Rate as of September 30, 2025 6.66%  
Maturity Date Sep. 30, 2034  
Trust Preferred Securities [Member] | Citywide Capital Trust V [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 13,041  
Issuance Date May 31, 2006  
Interest Rate 1.54% over 3-month term SOFR  
Interest Rate as of September 30, 2025 5.84%  
Maturity Date Jul. 25, 2036  
Trust Preferred Securities [Member] | OCGI Statutory Trust III [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 3,011  
Issuance Date Jun. 27, 2002  
Interest Rate 3.65% over 3-month term SOFR  
Interest Rate as of September 30, 2025 8.23%  
Maturity Date Sep. 30, 2032  
Trust Preferred Securities [Member] | OCGI Statutory Trust IV [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 5,638  
Issuance Date Sep. 23, 2004  
Interest Rate 2.50% over 3-month term SOFR  
Interest Rate as of September 30, 2025 6.80%  
Maturity Date Dec. 15, 2034  
Trust Preferred Securities [Member] | BVBC Capital Trust II [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 7,420  
Issuance Date Apr. 10, 2003  
Interest Rate 3.25% over 3-month term SOFR  
Interest Rate as of September 30, 2025 7.81%  
Maturity Date Apr. 24, 2033  
Trust Preferred Securities [Member] | BVBC Capital Trust III [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 10,238  
Issuance Date Jul. 29, 2005  
Interest Rate 1.60% over 3-month term SOFR  
Interest Rate as of September 30, 2025 5.86%  
Maturity Date Sep. 30, 2035