Annual report pursuant to Section 13 and 15(d)

COMMITMENTS AND CONTINGENT LIABILITIES - Narrative (Details)

v3.6.0.2
COMMITMENTS AND CONTINGENT LIABILITIES - Narrative (Details)
$ in Thousands
 2 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2016
lawsuit
Dec. 31, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2010
lawsuit
Sep. 28, 2015
USD ($)
Future minimum sublease rental payments:                
Operating leases, future minimum payments due, future minimum sublease rentals, total   $ 8,000   $ 8,000        
2016   3,000   3,000        
2017   2,000   2,000        
2018   2,000   2,000        
2019   1,000   1,000        
2020   0   0        
Thereafter   0   0        
Operating lease, future minimum payments due:                
2016   59,000   59,000        
2017   54,000   54,000        
2018   48,000   48,000        
2019   46,000   46,000        
2020   30,000   30,000        
Thereafter   152,000   152,000        
Total rental expense for all operating leases       65,000 $ 58,000 $ 57,000    
Maximum                
Loss Contingencies [Line Items]                
Loss Contingency, Estimate of Possible Loss   65,000   65,000        
Commercial letters-of-credit                
Loss Contingencies [Line Items]                
Contract amount represents credit risk   4,610   $ 4,610 56,119      
Maturity period of guarantee       90 days        
Commitments to Sell Loans                
Loss Contingencies [Line Items]                
Commitments to sell residential real estate loans   800,000   $ 800,000 659,000      
Maturity period of forward contracts relating mortgage banking business (less than)       1 year        
Standby letters of credit                
Loss Contingencies [Line Items]                
Contract amount represents credit risk   637,182   $ 637,182 511,706      
Maturity period of guarantee       2 years        
Outstanding standby letters of credit   8,000   $ 8,000 $ 7,000      
Cyberco Litigation                
Loss Contingencies [Line Items]                
Bankruptcy Court recommended judgment amount in Cyberco case, principle               $ 72,000
Loss Contingency Accrual, Period Increase (Decrease)   (42,000) $ 38,000          
FirstMerit Merger Litigation                
Loss Contingencies [Line Items]                
Number of lawsuits | lawsuit 5           2  
FirstMerit Overdraft Litigation | Cash                
Loss Contingencies [Line Items]                
Litigation Settlement, Amount   9,000            
FirstMerit Overdraft Litigation | Debt forgiveness                
Loss Contingencies [Line Items]                
Litigation Settlement, Amount   7,000            
FirstMerit Overdraft Litigation | Insurance Settlement                
Loss Contingencies [Line Items]                
Litigation Settlement, Amount   $ 4,000