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Investment Securities (Gains and losses by category) (Details) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost	$ 90,120,000	$ 301,479,000
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses	1,601,000	8,349,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	88,519,000	293,130,000
12 months or more
Available for sale - Amortized cost	90,120,000	121,141,000
Available for sale - Unrealized Loss	1,601,000	6,480,000
Available-for-sale, Fair Value	88,519,000	114,661,000
Less than 12 months
Available for sale - Amortized cost		180,338,000
Available for sale - Unrealized Loss		1,869,000
Available for sale - Fair Value		178,469,000
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract]
Held to Maturity Securities Continuous Unrealized Loss Position Amortized Cost	113,922,000	493,519,000
Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Losses	92,000	5,936,000
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value	113,830,000	487,583,000
Less than 12 months
Held to Maturity - Amortized cost	83,613,000	493,519,000
Held to Maturity - Unrealized Loss	46,000	5,936,000
Held-to-Maturity - Fair Value	83,567,000	487,583,000
More than 12 month [Abstract]
Held to Maturity - Amortized cost	120,429,000
Held to Maturity - Unrealized Loss	1,647,000
Held-to-Maturity - Fair Value	118,782,000
Investment Securities, Continuous Unrealized Loss Position [Abstract]
Continuous Unrealized Loss on Investment, Amortized Cost	204,042,000	794,998,000
Continuous Unrealized Loss On Investment Secuirities Agragatte Losses	1,693,000	14,285,000
Investment Securities Continuous Unrealized Loss Position Fair Value	202,349,000	780,713,000
CMO's issued by us government sponsored agenciesat loss
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost	83,400,000	129,076,000
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses	728,000	2,741,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	82,672,000	126,335,000
12 months or more
Available for sale - Amortized cost	83,400,000	103,340,000
Available for sale - Unrealized Loss	728,000	2,410,000
Available-for-sale, Fair Value	82,672,000	100,930,000
Less than 12 months
Available for sale - Amortized cost		25,736,000
Available for sale - Unrealized Loss		331,000
Available for sale - Fair Value		25,405,000
Obligation of Puerto Rico Government and political subdivisions [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost	6,720,000	17,801,000
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses	873,000	4,070,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	5,847,000	13,731,000
12 months or more
Available for sale - Amortized cost	6,720,000	17,801,000
Available for sale - Unrealized Loss	873,000	4,070,000
Available-for-sale, Fair Value	5,847,000	13,731,000
FNMA and FHLMC [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost		149,480,000
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses		1,509,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		147,971,000
Less than 12 months
Available for sale - Amortized cost		149,480,000
Available for sale - Unrealized Loss		1,509,000
Available for sale - Fair Value		147,971,000
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract]
Held to Maturity Securities Continuous Unrealized Loss Position Amortized Cost	88,898,000	468,487,000
Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Losses	81,000	5,865,000
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value	88,817,000	462,622,000
Less than 12 months
Held to Maturity - Amortized cost	58,589,000	468,487,000
Held to Maturity - Unrealized Loss	35,000	5,865,000
Held-to-Maturity - Fair Value	58,554,000	462,622,000
More than 12 month [Abstract]
Held to Maturity - Amortized cost	30,309,000
Held to Maturity - Unrealized Loss	46,000
Held-to-Maturity - Fair Value	30,263,000
Obligation of US Government sponsored agencies at loss [Member]
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
US Treasury Securities [Member]
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract]
Held to Maturity Securities Continuous Unrealized Loss Position Amortized Cost	25,024,000	25,032,000
Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Losses	11,000	71,000
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value	25,013,000	24,961,000
Less than 12 months
Held to Maturity - Amortized cost	25,024,000	25,032,000
Held to Maturity - Unrealized Loss	11,000	71,000
Held-to-Maturity - Fair Value	$ 25,013,000	$ 24,961,000

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Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer.

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Held to Maturity Securities Continuous Unrealized Loss Position 12 Months or More Amortized Cost

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
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