Quarterly report pursuant to Section 13 or 15(d)

COMMITMENTS AND CONTINGENT LIABILITIES - Narrative (Details)

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COMMITMENTS AND CONTINGENT LIABILITIES - Narrative (Details)
 2 Months Ended 3 Months Ended
Jan. 17, 2012
county
Jan. 19, 2007
USD ($)
transfer
Mar. 31, 2016
USD ($)
lawsuit
complaint
Mar. 31, 2016
USD ($)
lawsuit
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Sep. 28, 2015
USD ($)
Jul. 27, 2012
USD ($)
Dec. 08, 2006
USD ($)
Loss Contingencies [Line Items]                  
Maturity period of majority of standby letters of credit       P2Y          
Maturity period of Commercial letters of credit       P90D          
Maturity period of forward contracts relating mortgage banking business       1 year          
Aggregate range of reasonably possible losses current legal proceedings, Min     $ 0 $ 0          
Aggregate range of reasonably possible losses current legal proceedings, Max     $ 60,000,000 $ 60,000,000          
Cyberco Litigation                  
Loss Contingencies [Line Items]                  
Number of lawsuits | lawsuit       2          
Bankruptcy trustee alleging for the amount                 $ 70,000,000
Number of transfer types | transfer   2              
Fraudulent transfers alleged by Teleservices bankruptcy trustee   $ 73,000,000              
Preferential transfer alleged by bankruptcy trustee                 $ 1,000,000
Bankruptcy Court recommended judgment amount in Cyberco case, principal             $ 72,000,000 $ 72,000,000  
Bankruptcy Court recommended judgment amount in Cyberco case, interest               $ 9,000,000  
Loss contingency period increase (decrease)         $ 38,000,000        
MERSCORP Litigation [Member]                  
Loss Contingencies [Line Items]                  
Number of counties | county 88                
FirstMerit Merger Litigation [Member]                  
Loss Contingencies [Line Items]                  
Number of lawsuits | lawsuit     5            
Number of complaints | complaint     1            
Standby Letters of Credit                  
Loss Contingencies [Line Items]                  
Carrying amount of deferred revenue associated with guarantees     $ 7,000,000 $ 7,000,000   $ 7,000,000      
Outstanding standby letters of credit     $ 509,910,000 $ 509,910,000   511,706,000      
Percentage of Outstanding standby letters of credit collateralized     81.00% 81.00%          
Commercial letters-of-credit                  
Loss Contingencies [Line Items]                  
Outstanding standby letters of credit     $ 15,724,000 $ 15,724,000   56,119,000      
Commitments to Sell Loans                  
Loss Contingencies [Line Items]                  
Commitments to sell residential real estate loans     826,000,000 826,000,000   $ 659,000,000      
Risk Level, Low                  
Loss Contingencies [Line Items]                  
Outstanding standby letters of credit     148,000,000 148,000,000          
Risk Level, High                  
Loss Contingencies [Line Items]                  
Outstanding standby letters of credit     2,000,000 2,000,000          
Risk Level, Medium                  
Loss Contingencies [Line Items]                  
Outstanding standby letters of credit     $ 360,000,000 $ 360,000,000