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Investment Securities (Investment securities) (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 653,673,000 $ 955,646,000
Available-for-sale Securities, Gross Unrealized Gains 17,211,000 27,312,000
Available-for-sale Securities, Gross Unrealized Losses 1,601,000 8,349,000
Available-for-sale Securities $ 669,285,000 $ 974,609,000
Available for sale - Weighted Average Yield 2.56% 2.87%
Held-to-maturity, Amortized cost $ 637,036,000 $ 620,189,000
Held to maturity Securities Unrecognized Gains 4,402,000 426,000
Held-to-maturity Securities, Unrecognized Loss 92,000 5,936,000
Held to maturity Fair Value $ 641,346,000 $ 614,679,000
Held to maturity - Weighted Average Yield 2.17% 0.0217%
Total Securities - Amortized Cost $ 1,290,709,000 $ 1,575,835,000
Total Securities Gross Unrealized Gains 21,613,000 27,738,000
Total Securities Gross Unrealized Losses 1,693,000 14,285,000
Total Securities Fair Value $ 1,310,631,000 $ 1,589,288,000
Marketable Securities Weighted Average Yield 2.37% 2.60%
US Treasury Securities [Member]    
Schedule of Investments [Line Items]    
Held-to-maturity, Amortized cost   $ 25,032,000
Held to maturity Securities Unrecognized Gains   0
Held-to-maturity Securities, Unrecognized Loss   71,000
Held to maturity Fair Value   $ 24,961,000
Held to maturity - Weighted Average Yield   0.0049%
Obligation of US Government sponsored agencies at loss [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 4,785,000  
Available-for-sale Securities, Gross Unrealized Gains 51,000  
Available-for-sale Securities, Gross Unrealized Losses 0  
Available-for-sale Securities $ 4,837,000  
Available for sale - Weighted Average Yield 0.0136%  
Obligation of Puerto Rico Government and political subdivisions [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 6,720,000  
Available-for-sale Securities, Gross Unrealized Gains 0  
Available-for-sale Securities, Gross Unrealized Losses 873,000  
Available-for-sale Securities $ 5,847,000  
Available for sale - Weighted Average Yield 0.0555%  
Other Debt Obligations [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 2,323,000 $ 2,444,000
Available-for-sale Securities, Gross Unrealized Gains 142,000 128,000
Available-for-sale Securities, Gross Unrealized Losses 0 0
Available-for-sale Securities $ 2,465,000 $ 2,572,000
Available for sale - Weighted Average Yield 0.0299% 0.0298%
Collateralized Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 639,845,000 $ 930,279,000
Available-for-sale Securities, Gross Unrealized Gains 17,018,000 27,184,000
Available-for-sale Securities, Gross Unrealized Losses 728,000 4,250,000
Available-for-sale Securities $ 656,136,000 $ 953,213,000
Available for sale - Weighted Average Yield 2.54% 2.82%
Held-to-maturity, Amortized cost $ 612,012,000 $ 595,157,000
Held to maturity Securities Unrecognized Gains 4,402,000 426,000
Held-to-maturity Securities, Unrecognized Loss 81,000 5,865,000
Held to maturity Fair Value $ 616,333,000 $ 589,718,000
Held to maturity - Weighted Average Yield 2.23% 0.0224%
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 431,411,000 $ 735,363,000
Available-for-sale Securities, Gross Unrealized Gains 13,445,000 25,791,000
Available-for-sale Securities, Gross Unrealized Losses 0 1,509,000
Available-for-sale Securities $ 444,856,000 $ 759,645,000
Available for sale - Weighted Average Yield 2.63% 2.97%
Held-to-maturity, Amortized cost $ 612,012,000 $ 595,157,000
Held to maturity Securities Unrecognized Gains 4,402,000 426,000
Held-to-maturity Securities, Unrecognized Loss 81,000 5,865,000
Held to maturity Fair Value $ 616,333,000 $ 589,718,000
Held to maturity - Weighted Average Yield 2.23% 2.24%
Collateralized Mortgage Backed Securities [Member] | GNMA [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 79,477,000 $ 57,129,000
Available-for-sale Securities, Gross Unrealized Gains 3,220,000 1,366,000
Available-for-sale Securities, Gross Unrealized Losses 0 0
Available-for-sale Securities $ 82,697,000 $ 58,495,000
Available for sale - Weighted Average Yield 3.15% 3.19%
Collateralized Mortgage Backed Securities [Member] | CMO's [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 128,957,000 $ 137,787,000
Available-for-sale Securities, Gross Unrealized Gains 353,000 27,000
Available-for-sale Securities, Gross Unrealized Losses 728,000 2,741,000
Available-for-sale Securities $ 128,583,000 $ 135,073,000
Available for sale - Weighted Average Yield 1.86% 1.85%
Securities Investment [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 13,828,000 $ 25,367,000
Available-for-sale Securities, Gross Unrealized Gains 193,000 128,000
Available-for-sale Securities, Gross Unrealized Losses 873,000 4,099,000
Available-for-sale Securities $ 13,149,000 $ 21,396,000
Available for sale - Weighted Average Yield 3.67% 4.94%
Held-to-maturity, Amortized cost $ 25,024,000 $ 25,032,000
Held to maturity Securities Unrecognized Gains 0 0
Held-to-maturity Securities, Unrecognized Loss 11,000 71,000
Held to maturity Fair Value $ 25,013,000 $ 24,961,000
Held to maturity - Weighted Average Yield 0.49% 0.0049%
Securities Investment [Member] | US Treasury Securities [Member]    
Schedule of Investments [Line Items]    
Held-to-maturity, Amortized cost $ 25,024,000 $ 25,032,000
Held to maturity Securities Unrecognized Gains 0 0
Held-to-maturity Securities, Unrecognized Loss 11,000 71,000
Held to maturity Fair Value $ 25,013,000 $ 24,961,000
Held to maturity - Weighted Average Yield 0.49% 0.0049%
Securities Investment [Member] | Obligation of US Government sponsored agencies at loss [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 4,785,000 $ 5,122,000
Available-for-sale Securities, Gross Unrealized Gains 51,000 0
Available-for-sale Securities, Gross Unrealized Losses 0 29,000
Available-for-sale Securities $ 4,837,000 $ 5,093,000
Available for sale - Weighted Average Yield 1.36% 1.36%
Securities Investment [Member] | Obligation of Puerto Rico Government and political subdivisions [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 6,720,000 $ 17,801,000
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 873,000 4,070,000
Available-for-sale Securities $ 5,847,000 $ 13,731,000
Available for sale - Weighted Average Yield 5.55% 6.24%
Securities Investment [Member] | Other Debt Obligations [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 2,323,000 $ 2,444,000
Available-for-sale Securities, Gross Unrealized Gains 142,000 128,000
Available-for-sale Securities, Gross Unrealized Losses 0 0
Available-for-sale Securities $ 2,465,000 $ 2,572,000
Available for sale - Weighted Average Yield 2.99% 2.98%