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v3.26.1

Borrowed Funds - Summary of Outstanding Trust Preferred Securities (Parenthetical) (Detail) - Trust Preferred Securities [Member] | 3 Months Ended
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Mar. 31, 2026
Marquette Capital Trust I [Member] |
Debt Instrument [Line Items] |
Interest rate | 1.33%
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Marquette Capital Trust II [Member] |
Debt Instrument [Line Items] |
Interest rate | 1.33%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | us-gaap:SecuredOvernightFinancingRateSofrMember
Marquette Capital Trust III [Member] |
Debt Instrument [Line Items] |
Interest rate | 1.50%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | us-gaap:SecuredOvernightFinancingRateSofrMember
Marquette Capital Trust IV [Member] |
Debt Instrument [Line Items] |
Interest rate | 1.60%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | us-gaap:SecuredOvernightFinancingRateSofrMember
Heartland Financial Statutory Trust IV [Member] |
Debt Instrument [Line Items] |
Interest rate | 2.75%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | us-gaap:SecuredOvernightFinancingRateSofrMember
Heartland Financial Statutory Trust V [Member] |
Debt Instrument [Line Items] |
Interest rate | 1.33%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | us-gaap:SecuredOvernightFinancingRateSofrMember
Heartland Financial Statutory Trust VI [Member] |
Debt Instrument [Line Items] |
Interest rate | 1.48%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | us-gaap:SecuredOvernightFinancingRateSofrMember
Heartland Financial Statutory Trust VII [Member] |
Debt Instrument [Line Items] |
Interest rate | 1.48%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | us-gaap:SecuredOvernightFinancingRateSofrMember
Morrill Statutory Trust I [Member] |
Debt Instrument [Line Items] |
Interest rate | 3.25%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | us-gaap:SecuredOvernightFinancingRateSofrMember
Morrill Statutory Trust II [Member] |
Debt Instrument [Line Items] |
Interest rate | 2.85%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | us-gaap:SecuredOvernightFinancingRateSofrMember
Sheboygan Statutory Trust I [Member] |
Debt Instrument [Line Items] |
Interest rate | 2.95%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | us-gaap:SecuredOvernightFinancingRateSofrMember
CBNM Capital Trust I [Member] |
Debt Instrument [Line Items] |
Interest rate | 3.25%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | us-gaap:SecuredOvernightFinancingRateSofrMember
Citywide Capital Trust III [Member] |
Debt Instrument [Line Items] |
Interest rate | 2.80%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | us-gaap:SecuredOvernightFinancingRateSofrMember
Citywide Capital Trust IV [Member] |
Debt Instrument [Line Items] |
Interest rate | 2.20%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | us-gaap:SecuredOvernightFinancingRateSofrMember
Citywide Capital Trust V [Member] |
Debt Instrument [Line Items] |
Interest rate | 1.54%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | us-gaap:SecuredOvernightFinancingRateSofrMember
OCGI Statutory Trust III [Member] |
Debt Instrument [Line Items] |
Interest rate | 3.65%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | us-gaap:SecuredOvernightFinancingRateSofrMember
OCGI Statutory Trust IV [Member] |
Debt Instrument [Line Items] |
Interest rate | 2.50%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | us-gaap:SecuredOvernightFinancingRateSofrMember
BVBC Capital Trust II [Member] |
Debt Instrument [Line Items] |
Interest rate | 3.25%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | us-gaap:SecuredOvernightFinancingRateSofrMember
BVBC Capital Trust III [Member] |
Debt Instrument [Line Items] |
Interest rate | 1.60%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | us-gaap:SecuredOvernightFinancingRateSofrMember

X
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