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Commitments, Off-Balance Sheet Arrangements, and Legal Proceedings (Details Textuals)
$ in Thousands
Jan. 11, 2016
USD ($)
complaint
May 22, 2015
USD ($)
loan_production_office
branch
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]          
Unfunded commitments     $ 28,000 $ 24,000  
Carrying value of investments     68,000 52,000  
Commitments under unconsolidated projects     54,000 61,000  
Commitment term   3 years      
Mortgage loan commitment   $ 196,000      
Number of branch opening commitments | branch   1      
Number of loan production offices | loan_production_office   4      
Conciliation agreement cost, commitment term   4 years      
Number of complaints filed under legal proceedings | complaint 2        
Loans repurchased under make whole requests     2,000 3,000  
Loans sold to outside investors original amount     8,800,000    
Loans sold to outside investors remaining outstanding amount     6,000,000    
Residential mortgage loans sold with recourse risk     48,000 68,000  
Residential mortgage loans sold with credit recourse risk     104,000 132,000  
The Official Committee of Unsecured Creditors of World Marketing Chicago LLC v Associated Bank [Member]          
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]          
Damages sought $ 6,000        
Damages sought, cash 4,000        
American Funds Service Company v Associated Bank [Member]          
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]          
Damages sought $ 600        
Reserve for Off-balance Sheet Activities          
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]          
Unfunded commitments     28,400 24,400 $ 24,900
Mortgage Repurchase Reserve [Member]          
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]          
Unfunded commitments     1,534 1,197 $ 3,258
Standby Letters of Credit [Member]          
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]          
Lines of Credit, Fair Value Disclosure     $ 3,000 $ 3,000