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Investment Securities (Investment securities) (Details) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 649,280,000 $ 749,867,000
Available-for-sale Securities, Gross Unrealized Gains 3,819,000 8,740,000
Available-for-sale Securities, Gross Unrealized Losses 3,772,000 7,123,000
Available-for-sale Securities $ 649,327,000 $ 751,484,000
Available for sale - Weighted Average Yield 2.33% 2.53%
Held-to-maturity, Amortized cost $ 555,407,000 $ 599,884,000
Held to maturity Securities Unrecognized Gains 212,000 145,000
Held-to-maturity Securities, Unrecognized Loss 6,024,000 7,266,000
Held to maturity Fair Value $ 549,595,000 $ 592,763,000
Held to maturity - Weighted Average Yield 2.11% 2.15%
Total Securities - Amortized Cost $ 1,204,687,000 $ 1,349,751,000
Total Securities Gross Unrealized Gains 4,031,000 8,885,000
Total Securities Gross Unrealized Losses 9,796,000 14,389,000
Total Securities Fair Value $ 1,198,922,000 $ 1,344,247,000
Marketable Securities Weighted Average Yield 2.23% 2.36%
Collateralized Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 584,548,000 $ 689,772,000
Available-for-sale Securities, Gross Unrealized Gains 3,745,000 8,659,000
Available-for-sale Securities, Gross Unrealized Losses 3,362,000 5,879,000
Available-for-sale Securities $ 584,931,000 $ 692,552,000
Available for sale - Weighted Average Yield 2.42% 2.57%
Held-to-maturity, Amortized cost $ 555,407,000 $ 599,884,000
Held to maturity Securities Unrecognized Gains 212,000 145,000
Held-to-maturity Securities, Unrecognized Loss 6,024,000 7,266,000
Held to maturity Fair Value $ 549,595,000 $ 592,763,000
Held to maturity - Weighted Average Yield 2.11% 2.15%
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 346,388,000 $ 422,168,000
Available-for-sale Securities, Gross Unrealized Gains 2,102,000 6,354,000
Available-for-sale Securities, Gross Unrealized Losses 1,797,000 3,036,000
Available-for-sale Securities $ 346,693,000 $ 425,486,000
Available for sale - Weighted Average Yield 2.35% 2.59%
Held-to-maturity, Amortized cost $ 555,407,000 $ 599,884,000
Held to maturity Securities Unrecognized Gains 212,000 145,000
Held-to-maturity Securities, Unrecognized Loss 6,024,000 7,266,000
Held to maturity Fair Value $ 549,595,000 $ 592,763,000
Held to maturity - Weighted Average Yield 2.11% 2.15%
Collateralized Mortgage Backed Securities [Member] | GNMA [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 145,538,000 $ 163,614,000
Available-for-sale Securities, Gross Unrealized Gains 1,633,000 2,241,000
Available-for-sale Securities, Gross Unrealized Losses 487,000 620,000
Available-for-sale Securities $ 146,684,000 $ 165,235,000
Available for sale - Weighted Average Yield 2.93% 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 92,622,000 $ 103,990,000
Available-for-sale Securities, Gross Unrealized Gains 10,000 64,000
Available-for-sale Securities, Gross Unrealized Losses 1,078,000 2,223,000
Available-for-sale Securities $ 91,554,000 $ 101,831,000
Available for sale - Weighted Average Yield 1.89% 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 64,732,000 $ 60,095,000
Available-for-sale Securities, Gross Unrealized Gains 74,000 81,000
Available-for-sale Securities, Gross Unrealized Losses 410,000 1,244,000
Available-for-sale Securities $ 64,396,000 $ 58,932,000
Available for sale - Weighted Average Yield 1.51% 2.04%
Securities Investment [Member] | US Treasury Securities [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 55,031,000 $ 49,672,000
Available-for-sale Securities, Gross Unrealized Gains 3,000 0
Available-for-sale Securities, Gross Unrealized Losses 44,000 618,000
Available-for-sale Securities $ 54,990,000 $ 49,054,000
Available for sale - Weighted Average Yield 1.13% 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 3,353,000 $ 3,903,000
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 27,000 19,000
Available-for-sale Securities $ 3,326,000 $ 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 4,680,000 $ 4,680,000
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 339,000 607,000
Available-for-sale Securities $ 4,341,000 $ 4,073,000
Available for sale - Weighted Average Yield 5.55% 5.55%
Held-to-maturity, Amortized cost $ 0  
Held to maturity Fair Value 0  
Securities Investment [Member] | Other Debt Obligations [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 1,668,000 $ 1,840,000
Available-for-sale Securities, Gross Unrealized Gains 71,000 81,000
Available-for-sale Securities, Gross Unrealized Losses 0 0
Available-for-sale Securities $ 1,739,000 $ 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