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LOAN PORTFOLIO - Narratives (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Pledged as Collateral $ 1,900.0 $ 1,900.0  
Additional interest income that would have realized 21.4 35.2 $ 43.2
Residential Mortgage [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Servicing of loans 2,900.0 2,800.0  
Commercial loan [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Servicing of loans 273.4 361.3  
Origination Fees [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans And Leases Receivable Deferred Income 5.6 4.0  
Unearned Income [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans And Leases Receivable Deferred Income $ 51.3 $ 38.6