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Investment Securities (Investment securities) (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 854,511,000 $ 648,800,000
Available-for-sale Securities, Gross Unrealized Gains 1,469,000 2,940,000
Available-for-sale Securities, Gross Unrealized Losses 14,123,000 5,943,000
Available-for-sale Securities $ 841,857,000 $ 645,797,000
Available for sale - Weighted Average Yield 2.64% 2.46%
Held-to-maturity, Amortized cost $ 424,740,000 $ 506,064,000
Held to maturity Securities Unrecognized Gains 0 0
Held-to-maturity Securities, Unrecognized Loss 14,387,000 8,383,000
Held to maturity Fair Value $ 410,353,000 $ 497,681,000
Held to maturity - Weighted Average Yield 2.07% 2.07%
Total Securities - Amortized Cost $ 1,279,251,000 $ 1,154,864,000
Total Securities Gross Unrealized Gains 1,469,000 2,940,000
Total Securities Gross Unrealized Losses 28,510,000 14,326,000
Total Securities Fair Value $ 1,252,210,000 $ 1,143,478,000
Marketable Securities Weighted Average Yield 2.45% 2.29%
Collateralized Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 840,055,000 $ 631,656,000
Available-for-sale Securities, Gross Unrealized Gains 1,454,000 2,888,000
Available-for-sale Securities, Gross Unrealized Losses 13,944,000 5,420,000
Available-for-sale Securities $ 827,565,000 $ 629,124,000
Available for sale - Weighted Average Yield 2.66% 2.47%
Held-to-maturity, Amortized cost $ 424,740,000 $ 506,064,000
Held to maturity Securities Unrecognized Gains 0 0
Held-to-maturity Securities, Unrecognized Loss 14,387,000 8,383,000
Held to maturity Fair Value $ 410,353,000 $ 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 $ 561,878,000 $ 383,194,000
Available-for-sale Securities, Gross Unrealized Gains 404,000 1,402,000
Available-for-sale Securities, Gross Unrealized Losses 8,951,000 2,881,000
Available-for-sale Securities $ 553,331,000 $ 381,715,000
Available for sale - Weighted Average Yield 2.59% 2.39%
Held-to-maturity, Amortized cost $ 424,740,000 $ 506,064,000
Held to maturity Securities Unrecognized Gains 0 0
Held-to-maturity Securities, Unrecognized Loss 14,387,000 8,383,000
Held to maturity Fair Value $ 410,353,000 $ 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 $ 211,947,000 $ 166,436,000
Available-for-sale Securities, Gross Unrealized Gains 1,050,000 1,486,000
Available-for-sale Securities, Gross Unrealized Losses 2,827,000 584,000
Available-for-sale Securities $ 210,170,000 $ 167,338,000
Available for sale - Weighted Average Yield 3.10% 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 66,230,000 $ 82,026,000
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 2,166,000 1,955,000
Available-for-sale Securities $ 64,064,000 $ 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 14,456,000 $ 17,144,000
Available-for-sale Securities, Gross Unrealized Gains 15,000 52,000
Available-for-sale Securities, Gross Unrealized Losses 179,000 523,000
Available-for-sale Securities $ 14,292,000 $ 16,673,000
Available for sale - Weighted Average Yield 1.50% 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 10,924,000 $ 10,276,000
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 119,000 113,000
Available-for-sale Securities $ 10,805,000 $ 10,163,000
Available for sale - Weighted Average Yield 1.36% 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 2,325,000 $ 2,927,000
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 60,000 48,000
Available-for-sale Securities $ 2,265,000 $ 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 $ 1,207,000 $ 1,486,000
Available-for-sale Securities, Gross Unrealized Gains 15,000 52,000
Available-for-sale Securities, Gross Unrealized Losses 0 0
Available-for-sale Securities $ 1,222,000 $ 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