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OTHER BORROWINGS - Components of Other Borrowings (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Fbp Statutory Trust One [Member]        
Subordinated Borrowing [Line Items]        
Payments for Repurchase of Trust Preferred Securities $ 23.8      
Junior Subordinated Debt [Member] | Fbp Statutory Trust One [Member]        
Subordinated Borrowing [Line Items]        
Payments for Repurchase of Trust Preferred Securities $ 23.8 $ 7.3    
Junior Subordinated Debt [Member] | due June 17, 2034 [Member]        
Subordinated Borrowing [Line Items]        
Long Term Debt Percentage Bearing Variable Interest Rate     5.54% 4.35%
Subordinated Borrowing Due Date     Jun. 17, 2034  
Debt Instrument Basis Spread On Variable Rate     2.75%  
Junior Subordinated Debt [Member] | due June 17, 2034 [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Subordinated Borrowing [Line Items]        
Debt Instrument Description Of Variable Rate Basis     3-month LIBOR  
Junior Subordinated Debt [Member] | due September 20, 2034 [Member]        
Subordinated Borrowing [Line Items]        
Long Term Debt Percentage Bearing Variable Interest Rate     5.29% 4.12%
Subordinated Borrowing Due Date     Sep. 20, 2034  
Debt Instrument Basis Spread On Variable Rate     2.50%  
Junior Subordinated Debt [Member] | due September 20, 2034 [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Subordinated Borrowing [Line Items]        
Debt Instrument Description Of Variable Rate Basis     3-month LIBOR