Borrowed Funds - Summary of Outstanding Trust Preferred Securities (Parenthetical) (Detail) - Trust Preferred Securities [Member]
|
6 Months Ended |
Jun. 30, 2026 |
|---|
| Marquette Capital Trust I [Member] |
|
| Debt Instrument [Line Items] |
|
| Interest rate |
1.33%
|
| Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] |
us-gaap:SecuredOvernightFinancingRateSofrMember
|
| 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
|