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Investment Securities (Gains and losses by category) (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Total Available for Sale Amortization cost $ 794,998,000 $ 357,228,000
Total Available for Sale Unrealized Loss 14,285,000 9,631,000
Total Available for Sale Fair Value 780,713,000 347,597,000
12 months or more    
Available for sale - Amortized cost 121,141,000 278,320,000
Available for sale - Unrealized Loss 6,480,000 9,533,000
Available-for-sale, Fair Value 114,661,000 268,787,000
Less than 12 months    
Available for sale - Amortized cost 673,857,000 78,908,000
Available for sale - Unrealized Loss 7,805,000 98,000
Available for sale - Fair Value 666,052,000 78,810,000
CMO's issued by us government sponsored agenciesat loss    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Total Available for Sale Amortization cost 129,076,000 159,100,000
Total Available for Sale Unrealized Loss 2,741,000 3,153,000
Total Available for Sale Fair Value 126,335,000 155,947,000
12 months or more    
Available for sale - Amortized cost 103,340,000 143,928,000
Available for sale - Unrealized Loss 2,410,000 3,086,000
Available-for-sale, Fair Value 100,930,000 140,842,000
Less than 12 months    
Available for sale - Amortized cost 25,736,000 15,172,000
Available for sale - Unrealized Loss 331,000 67,000
Available for sale - Fair Value 25,405,000 15,105,000
Obligation of Puerto Rico Government and political subdivisions [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Total Available for Sale Amortization cost 17,801,000 20,939,000
Total Available for Sale Unrealized Loss 4,070,000 5,267,000
Total Available for Sale Fair Value 13,731,000 15,672,000
12 months or more    
Available for sale - Amortized cost 17,801,000 20,939,000
Available for sale - Unrealized Loss 4,070,000 5,267,000
Available-for-sale, Fair Value 13,731,000 15,672,000
FNMA and FHLMC [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Total Available for Sale Amortization cost 149,480,000 177,112,000
Total Available for Sale Unrealized Loss 1,509,000 1,203,000
Total Available for Sale Fair Value 147,971,000 175,909,000
12 months or more    
Available for sale - Amortized cost   113,376,000
Available for sale - Unrealized Loss   1,172,000
Available-for-sale, Fair Value   112,204,000
Less than 12 months    
Available for sale - Amortized cost 149,480,000 63,736,000
Available for sale - Unrealized Loss 1,509,000 31,000
Available for sale - Fair Value 147,971,000 63,705,000
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Total Available for Sale Amortization cost 0 77,000
Total Available for Sale Unrealized Loss 0 8,000
Total Available for Sale Fair Value 0 69,000
12 months or more    
Available for sale - Amortized cost   77,000
Available for sale - Unrealized Loss   8,000
Available-for-sale, Fair Value   $ 69,000
Less than 12 months    
Available for sale - Amortized cost 0  
Available for sale - Unrealized Loss 0  
Available for sale - Fair Value 0  
Obligation of US Government sponsored agencies at loss [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Total Available for Sale Amortization cost 5,122,000  
Total Available for Sale Unrealized Loss 29,000  
Total Available for Sale Fair Value 5,093,000  
Less than 12 months    
Available for sale - Amortized cost 5,122,000  
Available for sale - Unrealized Loss 29,000  
Available for sale - Fair Value $ 5,093,000