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DEBT SECURITIES - Investment Securities Held to Maturity (Detail) - USD ($)
Sep. 30, 2022
Dec. 31, 2021
Schedule Of Held To Maturity Securities [Line Items]    
Held To Maturity Securities Amortized $ 445,862,000  
Held to Maturity Gross Unrecognized gains 3,145,000  
Held to Maturity Gross Unrecognized losses 19,477,000  
Held to Maturity Fair value 429,530,000 $ 167,147,000
Allowance for credit losses, Held-to-Maturity securities $ 8,257,000 8,571,000
Held to Maturity Weighted-average yield 4.20%  
Held-to-maturity, accrued interest receivable, excluded from estimate of credit losses $ 2,800,000 3,400,000
Mortgage Backed Securities [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Held To Maturity Securities Amortized 280,476,000  
Held to Maturity Gross Unrecognized gains 0  
Held to Maturity Gross Unrecognized losses 11,924,000  
Held to Maturity Fair value 268,552,000  
Allowance for credit losses, Held-to-Maturity securities $ 0  
Held to Maturity Weighted-average yield 3.53%  
Municipal Bonds [Member] | Puerto Rico [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Held to Matury Amortized Due Withing One Year $ 1,200,000 2,995,000
Held to Maturity Gross Unrecognized gain Due Within One Year 0 5,000
Held to Maturity Gross Unrecognized losses Due Within One Year 24,000 0
Held to Maturity Fair value Due Within One Year 1,176,000 3,000,000
Allowance for credit losses Due within one year $ 4,000 $ 70,000
Held to Maturity Weighted-average yield Due withing One Year 4.49% 5.39%
Held to Maturity Amortized Cost After 1 to 5 years $ 42,426,000 $ 14,785,000
Held to Maturity Gross Unrecognized gains After 1 to 5 years 694,000 526,000
Held to Maturity Gross Unrecognized losses After 1 to 5 years 2,457,000 156,000
Held to Maturity Fair value After 1 to 5 years 40,663,000 15,155,000
Allowance for credit losses After 1 to 5 years $ 704,000 $ 347,000
Held to Maturity Weighted-average yield After 1 to 5 years 5.51% 2.35%
Held to Maturity Amortized Cost After 5 to 10 years $ 55,737,000 $ 90,584,000
Held to Maturity Gross Unrecognized gains After 5 to 10 yearss 2,451,000 1,555,000
Held to Maturity Gross Unrecognized losses After 5 to 10 years 1,599,000 3,139,000
Held to Maturity Fair value After 5 to 10 years 56,589,000 89,000,000
Allowance for credit losses After 5 to 10 years $ 3,295,000 $ 3,258,000
Held to Maturity Weighted-average yield After 5 to 10 years 4.82% 4.25%
Held to Maturity Amortized Cost After 10 years $ 66,023,000 $ 69,769,000
Held to Maturity Gross Unrecognized gains After 10 years 0 0
Held to Maturity Gross Unrecognized losses After 10 years 3,473,000 9,777,000
Held to Maturity Fair value After 10 years 62,550,000 59,992,000
Allowance for credit losses After 10 years $ 4,254,000 $ 4,896,000
Held to Maturity Weighted-average yield After 10 years 5.63% 4.06%
Held To Maturity Securities Amortized $ 165,386,000 $ 178,133,000
Held to Maturity Gross Unrecognized gains 3,145,000 2,086,000
Held to Maturity Gross Unrecognized losses 7,553,000 13,072,000
Held to Maturity Fair value 160,978,000 167,147,000
Allowance for credit losses, Held-to-Maturity securities $ 8,257,000 $ 8,571,000
Held to Maturity Weighted-average yield 5.32% 4.04%
FHLMC [Member] | Mortgage Backed Securities [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Held to Maturity Amortized Cost After 5 to 10 years $ 22,850,000  
Held to Maturity Gross Unrecognized gains After 5 to 10 yearss 0  
Held to Maturity Gross Unrecognized losses After 5 to 10 years 1,071,000  
Held to Maturity Fair value After 5 to 10 years 21,779,000  
Allowance for credit losses After 5 to 10 years $ 0  
Held to Maturity Weighted-average yield After 5 to 10 years 3.03%  
Held to Maturity Amortized Cost After 10 years $ 19,662,000  
Held to Maturity Gross Unrecognized gains After 10 years 0  
Held to Maturity Gross Unrecognized losses After 10 years 1,060,000  
Held to Maturity Fair value After 10 years 18,602,000  
Allowance for credit losses After 10 years $ 0  
Held to Maturity Weighted-average yield After 10 years 4.14%  
Held To Maturity Securities Amortized $ 42,512,000  
Held to Maturity Gross Unrecognized gains 0  
Held to Maturity Gross Unrecognized losses 2,131,000  
Held to Maturity Fair value 40,381,000  
Allowance for credit losses, Held-to-Maturity securities $ 0  
Held to Maturity Weighted-average yield 3.55%  
GNMA [Member] | Mortgage Backed Securities [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Held to Maturity Amortized Cost After 10 years $ 19,978,000  
Held to Maturity Gross Unrecognized gains After 10 years 0  
Held to Maturity Gross Unrecognized losses After 10 years 1,157,000  
Held to Maturity Fair value After 10 years 18,821,000  
Allowance for credit losses After 10 years $ 0  
Held to Maturity Weighted-average yield After 10 years 3.31%  
FNMA [Member] | Mortgage Backed Securities [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Held to Maturity Amortized Cost After 5 to 10 years $ 9,664,000  
Held to Maturity Gross Unrecognized gains After 5 to 10 yearss 0  
Held to Maturity Gross Unrecognized losses After 5 to 10 years 390,000  
Held to Maturity Fair value After 5 to 10 years 9,274,000  
Allowance for credit losses After 5 to 10 years $ 0  
Held to Maturity Weighted-average yield After 5 to 10 years 3.48%  
Held to Maturity Amortized Cost After 10 years $ 73,764,000  
Held to Maturity Gross Unrecognized gains After 10 years 0  
Held to Maturity Gross Unrecognized losses After 10 years 3,883,000  
Held to Maturity Fair value After 10 years 69,881,000  
Allowance for credit losses After 10 years $ 0  
Held to Maturity Weighted-average yield After 10 years 4.12%  
Held To Maturity Securities Amortized $ 83,428,000  
Held to Maturity Gross Unrecognized gains 0  
Held to Maturity Gross Unrecognized losses 4,273,000  
Held to Maturity Fair value 79,155,000  
Allowance for credit losses, Held-to-Maturity securities $ 0  
Held to Maturity Weighted-average yield 4.04%  
Collateralized Mortgage Obligations [Member] | Mortgage Backed Securities [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Held to Maturity Amortized Cost After 10 years $ 134,558,000  
Held to Maturity Gross Unrecognized gains After 10 years 0  
Held to Maturity Gross Unrecognized losses After 10 years 4,363,000  
Held to Maturity Fair value After 10 years 130,195,000  
Allowance for credit losses After 10 years $ 0  
Held to Maturity Weighted-average yield After 10 years 3.25%