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Investment Securities (Investment securities by contractual maturity) (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	669,285,000	974,609,000
Held-to-maturity, Amortized cost	637,036,000	620,189,000
Held to maturity Fair Value	641,346,000	614,679,000
US Treasury Securities [Member]
Schedule of Investments [Line Items]
Held-to-maturity, Amortized cost		25,032,000
Held to maturity Fair Value		24,961,000
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	4,837,000
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	5,847,000
Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	2,323,000	2,444,000
Available-for-sale Securities	2,465,000	2,572,000
Maturities Due From One To Five Years [Member]
Schedule of Investments [Line Items]
Held-to-maturity, Amortized cost	25,024,000
Held to maturity Fair Value	25,013,000
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	656,136,000	953,213,000
Held-to-maturity, Amortized cost	612,012,000	595,157,000
Held to maturity Fair Value	616,333,000	589,718,000
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	444,856,000	759,645,000
Held-to-maturity, Amortized cost	612,012,000	595,157,000
Held to maturity Fair Value	616,333,000	589,718,000
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	82,697,000	58,495,000
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	128,583,000	135,073,000
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	13,936,000
Available-for-sale Securities	14,250,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member] | FNMA and FHLMC [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	13,936,000
Available-for-sale Securities	14,250,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	625,909,000
Available-for-sale Securities	641,886,000
Held-to-maturity, Amortized cost	612,012,000
Held to maturity Fair Value	616,333,000
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | FNMA and FHLMC [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	417,475,000
Available-for-sale Securities	430,606,000
Held-to-maturity, Amortized cost	612,012,000
Held to maturity Fair Value	616,333,000
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	79,477,000
Available-for-sale Securities	82,697,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | CMO's [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	128,957,000
Available-for-sale Securities	128,583,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Investment Securities
Schedule of Investments [Line Items]
Available for sale Amortized Cost	13,828,000	25,367,000
Available-for-sale Securities	13,149,000	21,396,000
Held-to-maturity, Amortized cost	25,024,000	25,032,000
Held to maturity Fair Value	25,013,000	24,961,000
Investment Securities | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Held-to-maturity, Amortized cost	25,024,000	25,032,000
Held to maturity Fair Value	25,013,000	24,961,000
Investment Securities | 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	4,837,000	5,093,000
Investment Securities | 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	5,847,000	13,731,000
Investment Securities | Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	2,323,000	2,444,000
Available-for-sale Securities	2,465,000	$ 2,572,000
Investment Securities | Maturities Due From One To Five Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	6,720,000
Available-for-sale Securities	5,847,000
Held-to-maturity, Amortized cost	25,024,000
Held to maturity Fair Value	25,013,000
Investment Securities | Maturities Due From One To Five Years [Member] | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Held-to-maturity, Amortized cost	25,024,000
Held to maturity Fair Value	25,013,000
Investment Securities | Maturities Due From One To Five Years [Member] | 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	5,847,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Investment Securities | Maturities Due From Five To Ten Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	7,108,000
Available-for-sale Securities	7,302,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Investment Securities | Maturities Due From Five To Ten Years [Member] | 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	4,837,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	$ 0

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