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Borrowed Funds - Summary of Outstanding Trust Preferred Securities (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Debt Instrument [Line Items]    
Amount Outstanding $ 477,164 $ 474,229
Trust Preferred Securities [Member]    
Debt Instrument [Line Items]    
Amount Outstanding 221,176 $ 220,034
Trust Preferred Securities [Member] | Marquette Capital Trust I [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 19,410  
Issuance Date Dec. 28, 2005  
Interest Rate 1.33% over 3-month term SOFR  
Interest Rate as of March 31, 2026 5.26%  
Maturity Date Jan. 07, 2036  
Trust Preferred Securities [Member] | Marquette Capital Trust II [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 19,876  
Issuance Date Dec. 28, 2005  
Interest Rate 1.33% over 3-month term SOFR  
Interest Rate as of March 31, 2026 5.26%  
Maturity Date Jan. 07, 2036  
Trust Preferred Securities [Member] | Marquette Capital Trust III [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 7,803  
Issuance Date May 30, 2006  
Interest Rate 1.50% over 3-month term SOFR  
Interest Rate as of March 31, 2026 5.45%  
Maturity Date Jun. 23, 2036  
Trust Preferred Securities [Member] | Marquette Capital Trust IV [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 31,468  
Issuance Date Jun. 30, 2006  
Interest Rate 1.60% over 3-month term SOFR  
Interest Rate as of March 31, 2026 5.54%  
Maturity Date Sep. 15, 2036  
Trust Preferred Securities [Member] | Heartland Financial Statutory Trust IV [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 9,709  
Issuance Date Mar. 17, 2004  
Interest Rate 2.75% over 3-month term SOFR  
Interest Rate as of March 31, 2026 6.69%  
Maturity Date Mar. 17, 2034  
Trust Preferred Securities [Member] | Heartland Financial Statutory Trust V [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 17,596  
Issuance Date Jan. 27, 2006  
Interest Rate 1.33% over 3-month term SOFR  
Interest Rate as of March 31, 2026 5.26%  
Maturity Date Apr. 07, 2036  
Trust Preferred Securities [Member] | Heartland Financial Statutory Trust VI [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 17,048  
Issuance Date Jun. 21, 2007  
Interest Rate 1.48% over 3-month term SOFR  
Interest Rate as of March 31, 2026 5.42%  
Maturity Date Sep. 15, 2037  
Trust Preferred Securities [Member] | Heartland Financial Statutory Trust VII [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 14,917  
Issuance Date Jun. 26, 2007  
Interest Rate 1.48% over 3-month term SOFR  
Interest Rate as of March 31, 2026 5.41%  
Maturity Date Sep. 01, 2037  
Trust Preferred Securities [Member] | Morrill Statutory Trust I [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 10,012  
Issuance Date Dec. 19, 2002  
Interest Rate 3.25% over 3-month term SOFR  
Interest Rate as of March 31, 2026 7.22%  
Maturity Date Dec. 26, 2032  
Trust Preferred Securities [Member] | Morrill Statutory Trust II [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 9,774  
Issuance Date Dec. 17, 2003  
Interest Rate 2.85% over 3-month term SOFR  
Interest Rate as of March 31, 2026 6.79%  
Maturity Date Dec. 17, 2033  
Trust Preferred Securities [Member] | Sheboygan Statutory Trust I [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 7,378  
Issuance Date Sep. 17, 2003  
Interest Rate 2.95% over 3-month term SOFR  
Interest Rate as of March 31, 2026 6.89%  
Maturity Date Sep. 17, 2033  
Trust Preferred Securities [Member] | CBNM Capital Trust I [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 4,866  
Issuance Date Sep. 10, 2004  
Interest Rate 3.25% over 3-month term SOFR  
Interest Rate as of March 31, 2026 7.19%  
Maturity Date Dec. 15, 2034  
Trust Preferred Securities [Member] | Citywide Capital Trust III [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 6,829  
Issuance Date Dec. 19, 2003  
Interest Rate 2.80% over 3-month term SOFR  
Interest Rate as of March 31, 2026 6.73%  
Maturity Date Dec. 19, 2033  
Trust Preferred Securities [Member] | Citywide Capital Trust IV [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 4,721  
Issuance Date Sep. 30, 2004  
Interest Rate 2.20% over 3-month term SOFR  
Interest Rate as of March 31, 2026 6.13%  
Maturity Date Sep. 30, 2034  
Trust Preferred Securities [Member] | Citywide Capital Trust V [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 13,200  
Issuance Date May 31, 2006  
Interest Rate 1.54% over 3-month term SOFR  
Interest Rate as of March 31, 2026 5.48%  
Maturity Date Jul. 25, 2036  
Trust Preferred Securities [Member] | OCGI Statutory Trust III [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 3,030  
Issuance Date Jun. 27, 2002  
Interest Rate 3.65% over 3-month term SOFR  
Interest Rate as of March 31, 2026 7.58%  
Maturity Date Sep. 30, 2032  
Trust Preferred Securities [Member] | OCGI Statutory Trust IV [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 5,693  
Issuance Date Sep. 23, 2004  
Interest Rate 2.50% over 3-month term SOFR  
Interest Rate as of March 31, 2026 6.44%  
Maturity Date Dec. 15, 2034  
Trust Preferred Securities [Member] | BVBC Capital Trust II [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 7,477  
Issuance Date Apr. 10, 2003  
Interest Rate 3.25% over 3-month term SOFR  
Interest Rate as of March 31, 2026 7.18%  
Maturity Date Apr. 24, 2033  
Trust Preferred Securities [Member] | BVBC Capital Trust III [Member]    
Debt Instrument [Line Items]    
Amount Outstanding $ 10,369  
Issuance Date Jul. 29, 2005  
Interest Rate 1.60% over 3-month term SOFR  
Interest Rate as of March 31, 2026 5.56%  
Maturity Date Sep. 30, 2035