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Other Borrowings (Narrative) (Details)
12 Months Ended
May 10, 2016
USD ($)
Dec. 31, 2018
USD ($)
subsidiary
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   $ 13,300,000       $ 11,300,000    
Additional collateral, aggregate fair value   3,710,000,000       2,910,000,000    
FHLB borrowing capacity   1,350,000,000            
Long-term debt   $ 274,905,000       285,011,000    
Number of wholly-owned trust subsidiaries that issue preferred securities | subsidiary   13            
Senior notes   $ 5,000,000       11,000,000    
Borrowing capacity           20,000,000    
Nonrevolving Credit Facility                
Debt Instrument [Line Items]                
Borrowing capacity   70,000,000 $ 70,000,000 $ 75,000,000.0     $ 70,000,000  
Available borrowings   8,300,000            
Line of credit outstanding   0            
Interest Rate Swap                
Debt Instrument [Line Items]                
Amount of hedged debt $ 40,000,000              
Interest Rate Swap | Cash Flow Hedging                
Debt Instrument [Line Items]                
Amount of hedged debt   105,000,000     $ 9,000,000      
Interest Rate Swap | Designated as Hedging Instrument | Cash Flow Hedging | Nonrevolving Credit Facility                
Debt Instrument [Line Items]                
Amount of hedged debt $ 40,000,000 58,400,000       33,700,000    
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   74,100,000            
Wholesale repurchase agreements                
Debt Instrument [Line Items]                
Long-term debt   0       30,000,000    
Trust preferred securities                
Debt Instrument [Line Items]                
Long-term debt   130,913,000       121,886,000    
Deferred issuance costs   107,000            
Trust preferred securities | Tier 1                
Debt Instrument [Line Items]                
Long-term debt   130,900,000       121,900,000    
Senior notes                
Debt Instrument [Line Items]                
Long-term debt   5,000,000       11,000,000    
Senior notes | February 1, 2019                
Debt Instrument [Line Items]                
Debt instrument, maturity amount   5,000,000            
Contracts payable for purchase of real estate and other assets                
Debt Instrument [Line Items]                
Long-term debt   1,953,000       1,881,000    
Debt issued               $ 75,000,000
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   227,000       265,000    
Heartland Financial Statutory Trust IV | Interest Rate Swap | Cash Flow Hedging                
Debt Instrument [Line Items]                
Amount of hedged debt           25,000,000    
Heartland Financial Statutory Trust IV | Trust preferred securities                
Debt Instrument [Line Items]                
Long-term debt           10,000,000    
Repurchased debt amount   $ 15,000,000       $ 15,000,000