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Borrowed Funds - Summary of Outstanding Trust Preferred Securities (Parenthetical) (Detail) - Trust Preferred Securities [Member]	9 Months Ended
	Sep. 30, 2025
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%
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Marquette Capital Trust IV [Member]
Debt Instrument [Line Items]
Interest rate	1.60%
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Heartland Financial Statutory Trust IV [Member]
Debt Instrument [Line Items]
Interest rate	2.75%
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Heartland Financial Statutory Trust V [Member]
Debt Instrument [Line Items]
Interest rate	1.33%
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Heartland Financial Statutory Trust VI [Member]
Debt Instrument [Line Items]
Interest rate	1.48%
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Heartland Financial Statutory Trust VII [Member]
Debt Instrument [Line Items]
Interest rate	1.48%
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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

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