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Investment Securities (Investment securities) (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 648,800,000 $ 749,867,000
Available-for-sale Securities, Gross Unrealized Gains 2,940,000 8,740,000
Available-for-sale Securities, Gross Unrealized Losses 5,943,000 7,123,000
Available-for-sale Securities $ 645,797,000 $ 751,484,000
Available for sale - Weighted Average Yield 2.46% 2.53%
Held-to-maturity, Amortized cost $ 506,064,000 $ 599,884,000
Held to maturity Securities Unrecognized Gains 0 145,000
Held-to-maturity Securities, Unrecognized Loss 8,383,000 7,266,000
Held to maturity Fair Value $ 497,681,000 $ 592,763,000
Held to maturity - Weighted Average Yield 2.07% 2.15%
Total Securities - Amortized Cost $ 1,154,864,000 $ 1,349,751,000
Total Securities Gross Unrealized Gains 2,940,000 8,885,000
Total Securities Gross Unrealized Losses 14,326,000 14,389,000
Total Securities Fair Value $ 1,143,478,000 $ 1,344,247,000
Marketable Securities Weighted Average Yield 2.29% 2.36%
Collateralized Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 631,656,000 $ 689,772,000
Available-for-sale Securities, Gross Unrealized Gains 2,888,000 8,659,000
Available-for-sale Securities, Gross Unrealized Losses 5,420,000 5,879,000
Available-for-sale Securities $ 629,124,000 $ 692,552,000
Available for sale - Weighted Average Yield 2.47% 2.57%
Held-to-maturity, Amortized cost $ 506,064,000 $ 599,884,000
Held to maturity Securities Unrecognized Gains 0 145,000
Held-to-maturity Securities, Unrecognized Loss 8,383,000 7,266,000
Held to maturity Fair Value $ 497,681,000 $ 592,763,000
Held to maturity - Weighted Average Yield 2.07% 2.15%
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 383,194,000 $ 422,168,000
Available-for-sale Securities, Gross Unrealized Gains 1,402,000 6,354,000
Available-for-sale Securities, Gross Unrealized Losses 2,881,000 3,036,000
Available-for-sale Securities $ 381,715,000 $ 425,486,000
Available for sale - Weighted Average Yield 2.39% 2.59%
Held-to-maturity, Amortized cost $ 506,064,000 $ 599,884,000
Held to maturity Securities Unrecognized Gains 0 145,000
Held-to-maturity Securities, Unrecognized Loss 8,383,000 7,266,000
Held to maturity Fair Value $ 497,681,000 $ 592,763,000
Held to maturity - Weighted Average Yield 2.07% 2.15%
Collateralized Mortgage Backed Securities [Member] | GNMA [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 166,436,000 $ 163,614,000
Available-for-sale Securities, Gross Unrealized Gains 1,486,000 2,241,000
Available-for-sale Securities, Gross Unrealized Losses 584,000 620,000
Available-for-sale Securities $ 167,338,000 $ 165,235,000
Available for sale - Weighted Average Yield 2.94% 2.95%
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 82,026,000 $ 103,990,000
Available-for-sale Securities, Gross Unrealized Gains 0 64,000
Available-for-sale Securities, Gross Unrealized Losses 1,955,000 2,223,000
Available-for-sale Securities $ 80,071,000 $ 101,831,000
Available for sale - Weighted Average Yield 1.90% 1.88%
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 17,144,000 $ 60,095,000
Available-for-sale Securities, Gross Unrealized Gains 52,000 81,000
Available-for-sale Securities, Gross Unrealized Losses 523,000 1,244,000
Available-for-sale Securities $ 16,673,000 $ 58,932,000
Available for sale - Weighted Average Yield 2.04% 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 10,276,000 $ 49,672,000
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 113,000 618,000
Available-for-sale Securities $ 10,163,000 $ 49,054,000
Available for sale - Weighted Average Yield 1.25% 1.73%
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 2,927,000 $ 3,903,000
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 48,000 19,000
Available-for-sale Securities $ 2,879,000 $ 3,884,000
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 $ 4,680,000
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 362,000 607,000
Available-for-sale Securities $ 2,093,000 $ 4,073,000
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 $ 1,486,000 $ 1,840,000
Available-for-sale Securities, Gross Unrealized Gains 52,000 81,000
Available-for-sale Securities, Gross Unrealized Losses 0 0
Available-for-sale Securities $ 1,538,000 $ 1,921,000
Available for sale - Weighted Average Yield 2.97% 3.00%
Held-to-maturity, Amortized cost $ 0  
Held to maturity Fair Value $ 0