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INVESTMENT SECURITIES - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Schedule Of Investments [Line Items]      
Gain on Sale of Investments $ 8,247,000 $ 0  
Fair value 1,932,178,000   $ 2,123,525,000
Gross Unrealized loss 6,562,000   10,056,000
Allowance for Credit Losse, Available-for-sale securities 368,000   0
Allowance for Credit Losse, Held-to-maturity securities 9,268,000   0
Debt Securities, Held-to-maturity, Past Due $ 0    
Debt Securities, Held-to-maturity, Threshold Period Past Due 30 days    
Municipal Bonds [Member] | Puerto Rico [Member]      
Schedule Of Investments [Line Items]      
Allowance for Credit Losse, Held-to-maturity securities $ 9,268,000   0
Held to Maturity Amortized cost 138,534,000   138,675,000
Cash and Cash Equivalents [Member]      
Schedule Of Investments [Line Items]      
Held to Maturity Amortized cost 0   0
MBS [Member]      
Schedule Of Investments [Line Items]      
Proceeds From Sale Of Available For Sale Securities 275,600,000    
Gain on Sale of Investments 8,200,000    
Fair value 1,569,625,000   1,783,504,000
Gross Unrealized loss 5,342,000   8,440,000
Allowance for Credit Losse, Available-for-sale securities 368,000    
MBS [Member] | Private label [Member]      
Schedule Of Investments [Line Items]      
Fair value 10,300,000    
Gross Unrealized loss 4,700,000    
Allowance for Credit Losse, Available-for-sale securities 368,000   $ 0
Puerto Rico Government obligations [Member]      
Schedule Of Investments [Line Items]      
Fair value 7,300,000    
Net Unrealized loss 800,000    
Puerto Rico Government obligations [Member] | Residential Mortgage Backed Securities [Member]      
Schedule Of Investments [Line Items]      
Fair value 3,000,000.0    
Gross Unrealized loss $ 1,100,000    
Available-for-sale Securities [Member]      
Schedule Of Investments [Line Items]      
Percentage Of Debt Securities Government And Government Sponsored Agencies 99.00%    
Available-for-sale Securities [Member] | MBS [Member] | Private label [Member]      
Schedule Of Investments [Line Items]      
Provision for Other Credit Losses $ 368,000    
Available-for-sale Securities [Member] | MBS [Member] | Private label [Member] | FICO Score, Greater than 700 [Member] | LTV Less than 80 Percent [Member]      
Schedule Of Investments [Line Items]      
Financing Receivable, Credit Quality, Additional Information The underlying collateral are fixed-rate, single-family residential mortgage loans in the United State with original FICO scores over 700 and moderate loan-to-value ratios (under 80%), as well as moderate delinquency levels.    
Available-for-sale Securities [Member] | MBS [Member] | Private label [Member] | LIBOR [Member]      
Schedule Of Investments [Line Items]      
Loans Receivable, Description of Variable Rate Basis The interest rate on these private-label MBS is variable, tied to 3-month LIBOR and limited to the weighted-average coupon on the underlying collateral.    
Held-to-maturity Securities [Member] | Municipal Bonds [Member] | Puerto Rico [Member]      
Schedule Of Investments [Line Items]      
Provision for Other Credit Losses $ 1,134,000