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Securities (Other-than-temporary impairments) (Details) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 3 Months Ended
Mar. 31, 2012
securities
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Available-for-sale Securities
Dec. 31, 2013
Available-for-sale Securities
Mar. 31, 2014
Held-to-maturity Securities
Dec. 31, 2013
Held-to-maturity Securities
Mar. 31, 2014
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Investments, Debt and Equity Securities [Abstract]                
Recorded as part of gross realized losses: Credit related OTTI   $ 0 $ 0          
Recorded as part of gross realized losses: Intent to sell OTTI   0 0          
Total recorded as part of gross realized losses 981 0 0          
Recorded directly to AOCI for non-credit related impairment: Residential mortgage backed securities   0 0          
Recorded directly to AOCI for non-credit related impairment: Accretion of non-credit related impairment   (24) (24)          
Total changes to AOCI for non-credit related impairment   (24) (24)          
Total OTTI losses (accretion) recorded on debt securities, net   (24) (24)          
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]                
Credit losses related OTTI       184 184 797 797  
Non-credit related OTTI           493 517  
Percentage of Heartland's mortgage-backed securities               95.00%
Number of mortgage-backed securities with recorded OTTI 3              
OTTI write-downs included in earnings, available for sale debt securities 184              
OTTI write-downs included in earnings, held to maturity debt securities $ 797