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Investment Securities (Investment securities) (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 611,936,000 $ 749,867,000
Available-for-sale Securities, Gross Unrealized Gains 4,739,000 8,740,000
Available-for-sale Securities, Gross Unrealized Losses 3,252,000 7,123,000
Available-for-sale Securities $ 613,423,000 $ 751,484,000
Available for sale - Weighted Average Yield 2.44% 2.53%
Held-to-maturity, Amortized cost $ 530,178,000 $ 599,884,000
Held to maturity Securities Unrecognized Gains 367,000 145,000
Held-to-maturity Securities, Unrecognized Loss 4,715,000 7,266,000
Held to maturity Fair Value $ 525,830,000 $ 592,763,000
Held to maturity - Weighted Average Yield 2.09% 2.15%
Total Securities - Amortized Cost $ 1,142,114,000 $ 1,349,751,000
Total Securities Gross Unrealized Gains 5,106,000 8,885,000
Total Securities Gross Unrealized Losses 7,967,000 14,389,000
Total Securities Fair Value $ 1,139,253,000 $ 1,344,247,000
Marketable Securities Weighted Average Yield 2.28% 2.36%
Collateralized Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 594,479,000 $ 689,772,000
Available-for-sale Securities, Gross Unrealized Gains 4,667,000 8,659,000
Available-for-sale Securities, Gross Unrealized Losses 2,923,000 5,879,000
Available-for-sale Securities $ 596,223,000 $ 692,552,000
Available for sale - Weighted Average Yield 2.45% 2.57%
Held-to-maturity, Amortized cost $ 530,178,000 $ 599,884,000
Held to maturity Securities Unrecognized Gains 367,000 145,000
Held-to-maturity Securities, Unrecognized Loss 4,715,000 7,266,000
Held to maturity Fair Value $ 525,830,000 $ 592,763,000
Held to maturity - Weighted Average Yield 2.09% 2.15%
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 344,581,000 $ 422,168,000
Available-for-sale Securities, Gross Unrealized Gains 2,464,000 6,354,000
Available-for-sale Securities, Gross Unrealized Losses 1,462,000 3,036,000
Available-for-sale Securities $ 345,583,000 $ 425,486,000
Available for sale - Weighted Average Yield 2.36% 2.59%
Held-to-maturity, Amortized cost $ 530,178,000 $ 599,884,000
Held to maturity Securities Unrecognized Gains 367,000 145,000
Held-to-maturity Securities, Unrecognized Loss 4,715,000 7,266,000
Held to maturity Fair Value $ 525,830,000 $ 592,763,000
Held to maturity - Weighted Average Yield 2.09% 2.15%
Collateralized Mortgage Backed Securities [Member] | GNMA [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 162,993,000 $ 163,614,000
Available-for-sale Securities, Gross Unrealized Gains 2,197,000 2,241,000
Available-for-sale Securities, Gross Unrealized Losses 423,000 620,000
Available-for-sale Securities $ 164,767,000 $ 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 86,905,000 $ 103,990,000
Available-for-sale Securities, Gross Unrealized Gains 6,000 64,000
Available-for-sale Securities, Gross Unrealized Losses 1,038,000 2,223,000
Available-for-sale Securities $ 85,873,000 $ 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 17,457,000 $ 60,095,000
Available-for-sale Securities, Gross Unrealized Gains 72,000 81,000
Available-for-sale Securities, Gross Unrealized Losses 329,000 1,244,000
Available-for-sale Securities $ 17,200,000 $ 58,932,000
Available for sale - Weighted Average Yield 2.42% 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 10,269,000 $ 49,672,000
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 51,000 618,000
Available-for-sale Securities $ 10,218,000 $ 49,054,000
Available for sale - Weighted Average Yield 1.26% 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 3,121,000 $ 3,903,000
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 29,000 19,000
Available-for-sale Securities $ 3,092,000 $ 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 249,000 607,000
Available-for-sale Securities $ 2,206,000 $ 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 $ 1,612,000 $ 1,840,000
Available-for-sale Securities, Gross Unrealized Gains 72,000 81,000
Available-for-sale Securities, Gross Unrealized Losses 0 0
Available-for-sale Securities $ 1,684,000 $ 1,921,000
Available for sale - Weighted Average Yield 3.00% 3.00%
Held-to-maturity, Amortized cost $ 0  
Held to maturity Fair Value $ 0