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Other Borrowings (Narrative) (Details)
12 Months Ended
May 10, 2016
USD ($)
Dec. 31, 2019
USD ($)
subsidiary
Dec. 31, 2018
USD ($)
Jun. 14, 2018
USD ($)
Jun. 13, 2018
USD ($)
May 18, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 15, 2015
USD ($)
Dec. 17, 2014
USD ($)
Debt Instrument [Line Items]                  
FHLB stock, required collateral   $ 11,300,000 $ 13,300,000            
Additional collateral, aggregate fair value   4,110,000,000 3,710,000,000            
FHLB borrowing capacity   $ 1,560,000,000              
Number of wholly-owned trust subsidiaries that issue preferred securities | subsidiary   15              
Long-term debt   $ 275,773,000 274,905,000            
Senior notes   0 5,000,000.0            
Nonrevolving Credit Facility                  
Debt Instrument [Line Items]                  
Borrowing capacity   70,000,000.0   $ 70,000,000.0 $ 75,000,000.0     $ 70,000,000.0  
Available borrowings   14,800,000              
Line of credit outstanding   0              
Interest Rate Swap                  
Debt Instrument [Line Items]                  
Amount of hedged debt $ 40,000,000.0                
Interest Rate Swap | Cash Flow Hedging                  
Debt Instrument [Line Items]                  
Amount of hedged debt   105,000,000.0       $ 9,000,000.0      
Interest Rate Swap | Designated as Hedging Instrument | Cash Flow Hedging | Nonrevolving Credit Facility                  
Debt Instrument [Line Items]                  
Amount of hedged debt $ 40,000,000.0 51,400,000 58,400,000            
Fixed interest rate on derivative (as a percent) 2.50%                
Term of derivative instrument 5 years                
Tier 1                  
Debt Instrument [Line Items]                  
Subordinated notes qualified as Tier 2 capital   74,300,000              
Trust preferred securities                  
Debt Instrument [Line Items]                  
Deferred issuance costs   90,000              
Long-term debt   145,343,000 130,913,000            
Trust preferred securities | Tier 1                  
Debt Instrument [Line Items]                  
Long-term debt   145,200,000 130,900,000            
Senior notes                  
Debt Instrument [Line Items]                  
Long-term debt   0 5,000,000            
Contracts payable for purchase of real estate and other assets                  
Debt Instrument [Line Items]                  
Long-term debt   1,892,000 1,953,000            
Debt issued                 $ 75,000,000.0
Debt discount                 $ 1,100,000
Stated interest rate (as a percent)                 5.75%
Contracts payable for purchase of real estate and other assets | Other Assets                  
Debt Instrument [Line Items]                  
Unamortized debt issuance expense   $ 189,000 $ 227,000            
Heartland Financial Statutory Trust IV | Trust preferred securities                  
Debt Instrument [Line Items]                  
Repurchased debt amount             $ 2,600,000