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Investment Securities (Investment securities) (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 872,895,000 $ 648,800,000
Available-for-sale Securities, Gross Unrealized Gains 327,000 2,940,000
Available-for-sale Securities, Gross Unrealized Losses 24,670,000 5,943,000
Available-for-sale Securities $ 848,552,000 $ 645,797,000
Available for sale - Weighted Average Yield 2.62% 2.46%
Held-to-maturity, Amortized cost $ 444,679,000 $ 506,064,000
Held to maturity Securities Unrecognized Gains 0 0
Held-to-maturity Securities, Unrecognized Loss 19,613,000 8,383,000
Held to maturity Fair Value $ 425,066,000 $ 497,681,000
Held to maturity - Weighted Average Yield 2.07% 2.07%
Total Securities - Amortized Cost $ 1,317,574,000 $ 1,154,864,000
Total Securities Gross Unrealized Gains 327,000 2,940,000
Total Securities Gross Unrealized Losses 44,283,000 14,326,000
Total Securities Fair Value $ 1,273,618,000 $ 1,143,478,000
Marketable Securities Weighted Average Yield 2.44% 2.29%
Collateralized Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 858,642,000 $ 631,656,000
Available-for-sale Securities, Gross Unrealized Gains 320,000 2,888,000
Available-for-sale Securities, Gross Unrealized Losses 24,424,000 5,420,000
Available-for-sale Securities $ 834,538,000 $ 629,124,000
Available for sale - Weighted Average Yield 2.64% 2.47%
Held-to-maturity, Amortized cost $ 444,679,000 $ 506,064,000
Held to maturity Securities Unrecognized Gains 0 0
Held-to-maturity Securities, Unrecognized Loss 19,613,000 8,383,000
Held to maturity Fair Value $ 425,066,000 $ 497,681,000
Held to maturity - Weighted Average Yield 2.07% 2.07%
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 586,097,000 $ 383,194,000
Available-for-sale Securities, Gross Unrealized Gains 20,000 1,402,000
Available-for-sale Securities, Gross Unrealized Losses 15,799,000 2,881,000
Available-for-sale Securities $ 570,318,000 $ 381,715,000
Available for sale - Weighted Average Yield 2.59% 2.39%
Held-to-maturity, Amortized cost $ 444,679,000 $ 506,064,000
Held to maturity Securities Unrecognized Gains 0 0
Held-to-maturity Securities, Unrecognized Loss 19,613,000 8,383,000
Held to maturity Fair Value $ 425,066,000 $ 497,681,000
Held to maturity - Weighted Average Yield 2.07% 2.07%
Collateralized Mortgage Backed Securities [Member] | GNMA [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 202,585,000 $ 166,436,000
Available-for-sale Securities, Gross Unrealized Gains 300,000 1,486,000
Available-for-sale Securities, Gross Unrealized Losses 5,431,000 584,000
Available-for-sale Securities $ 197,454,000 $ 167,338,000
Available for sale - Weighted Average Yield 3.06% 2.94%
Held-to-maturity, Amortized cost $ 0  
Held to maturity Fair Value 0  
Collateralized Mortgage Backed Securities [Member] | CMO's [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 69,960,000 $ 82,026,000
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 3,194,000 1,955,000
Available-for-sale Securities $ 66,766,000 $ 80,071,000
Available for sale - Weighted Average Yield 1.90% 1.90%
Held-to-maturity, Amortized cost $ 0  
Held to maturity Fair Value 0  
Securities Investment [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 14,253,000 $ 17,144,000
Available-for-sale Securities, Gross Unrealized Gains 7,000 52,000
Available-for-sale Securities, Gross Unrealized Losses 246,000 523,000
Available-for-sale Securities $ 14,014,000 $ 16,673,000
Available for sale - Weighted Average Yield 1.46% 2.04%
Held-to-maturity, Amortized cost $ 0  
Held to maturity Fair Value 0  
Securities Investment [Member] | US Treasury Securities [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 10,617,000 $ 10,276,000
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 157,000 113,000
Available-for-sale Securities $ 10,460,000 $ 10,163,000
Available for sale - Weighted Average Yield 1.32% 1.25%
Held-to-maturity, Amortized cost $ 0  
Held to maturity Fair Value 0  
Securities Investment [Member] | Obligation of US Government sponsored agencies at loss [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 2,484,000 $ 2,927,000
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 89,000 48,000
Available-for-sale Securities $ 2,395,000 $ 2,879,000
Available for sale - Weighted Average Yield 1.38% 1.38%
Held-to-maturity, Amortized cost $ 0  
Held to maturity Fair Value 0  
Securities Investment [Member] | Obligation of Puerto Rico Government and political subdivisions [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 0 $ 2,455,000
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 0 362,000
Available-for-sale Securities $ 0 $ 2,093,000
Available for sale - Weighted Average Yield 0.00% 5.55%
Securities Investment [Member] | Other Debt Obligations [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 1,152,000 $ 1,486,000
Available-for-sale Securities, Gross Unrealized Gains 7,000 52,000
Available-for-sale Securities, Gross Unrealized Losses 0 0
Available-for-sale Securities $ 1,159,000 $ 1,538,000
Available for sale - Weighted Average Yield 2.99% 2.97%
Held-to-maturity, Amortized cost $ 0  
Held to maturity Fair Value $ 0