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Investment Securities (Investment securities) (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 815,970,000 $ 648,800,000
Available-for-sale Securities, Gross Unrealized Gains 674,000 2,940,000
Available-for-sale Securities, Gross Unrealized Losses 15,003,000 5,943,000
Available-for-sale Securities $ 801,641,000 $ 645,797,000
Available for sale - Weighted Average Yield 2.55% 2.46%
Held-to-maturity, Amortized cost $ 485,143,000 $ 506,064,000
Held to maturity Securities Unrecognized Gains 0 0
Held-to-maturity Securities, Unrecognized Loss 17,163,000 8,383,000
Held to maturity Fair Value $ 467,980,000 $ 497,681,000
Held to maturity - Weighted Average Yield 2.07% 2.07%
Total Securities - Amortized Cost $ 1,301,113,000 $ 1,154,864,000
Total Securities Gross Unrealized Gains 674,000 2,940,000
Total Securities Gross Unrealized Losses 32,166,000 14,326,000
Total Securities Fair Value $ 1,269,621,000 $ 1,143,478,000
Marketable Securities Weighted Average Yield 2.37% 2.29%
Collateralized Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 799,059,000 $ 631,656,000
Available-for-sale Securities, Gross Unrealized Gains 645,000 2,888,000
Available-for-sale Securities, Gross Unrealized Losses 14,732,000 5,420,000
Available-for-sale Securities $ 784,972,000 $ 629,124,000
Available for sale - Weighted Average Yield 2.56% 2.47%
Held-to-maturity, Amortized cost $ 485,143,000 $ 506,064,000
Held to maturity Securities Unrecognized Gains 0 0
Held-to-maturity Securities, Unrecognized Loss 17,163,000 8,383,000
Held to maturity Fair Value $ 467,980,000 $ 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 $ 538,900,000 $ 383,194,000
Available-for-sale Securities, Gross Unrealized Gains 328,000 1,402,000
Available-for-sale Securities, Gross Unrealized Losses 9,133,000 2,881,000
Available-for-sale Securities $ 530,095,000 $ 381,715,000
Available for sale - Weighted Average Yield 2.51% 2.39%
Held-to-maturity, Amortized cost $ 485,143,000 $ 506,064,000
Held to maturity Securities Unrecognized Gains 0 0
Held-to-maturity Securities, Unrecognized Loss 17,163,000 8,383,000
Held to maturity Fair Value $ 467,980,000 $ 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 $ 182,055,000 $ 166,436,000
Available-for-sale Securities, Gross Unrealized Gains 317,000 1,486,000
Available-for-sale Securities, Gross Unrealized Losses 2,870,000 584,000
Available-for-sale Securities $ 179,502,000 $ 167,338,000
Available for sale - Weighted Average Yield 2.97% 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 78,104,000 $ 82,026,000
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 2,729,000 1,955,000
Available-for-sale Securities $ 75,375,000 $ 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 16,911,000 $ 17,144,000
Available-for-sale Securities, Gross Unrealized Gains 29,000 52,000
Available-for-sale Securities, Gross Unrealized Losses 271,000 523,000
Available-for-sale Securities $ 16,669,000 $ 16,673,000
Available for sale - Weighted Average Yield 2.06% 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 10,280,000 $ 10,276,000
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 156,000 113,000
Available-for-sale Securities $ 10,124,000 $ 10,163,000
Available for sale - Weighted Average Yield 1.28% 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 2,773,000 $ 2,927,000
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 72,000 48,000
Available-for-sale Securities $ 2,701,000 $ 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 2,455,000 $ 2,455,000
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 43,000 362,000
Available-for-sale Securities $ 2,412,000 $ 2,093,000
Available for sale - Weighted Average Yield 5.55% 5.55%
Securities Investment [Member] | Other Debt Obligations [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 1,403,000 $ 1,486,000
Available-for-sale Securities, Gross Unrealized Gains 29,000 52,000
Available-for-sale Securities, Gross Unrealized Losses 0 0
Available-for-sale Securities $ 1,432,000 $ 1,538,000
Available for sale - Weighted Average Yield 2.98% 2.97%
Held-to-maturity, Amortized cost $ 0  
Held to maturity Fair Value $ 0