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v3.26.1

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 |

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