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Investment Securities (Investment securities by contractual maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Investments [Line Items]
Available for sale Amortized Cost	$ 645,298	$ 955,646
Available-for-sale Securities	664,302	974,609
Held-to-maturity, Amortized cost	635,399	620,189
Held to maturity Fair Value	643,530	614,679
Collateralized Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	632,009	930,279
Available-for-sale Securities	651,724	953,213
Held-to-maturity, Amortized cost	610,384	595,157
Held to maturity Fair Value	618,505	589,718
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	402,557	735,363
Available-for-sale Securities	416,971	759,645
Held-to-maturity, Amortized cost	610,384	595,157
Held to maturity Fair Value	618,505	589,718
Collateralized Mortgage Backed Securities [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	109,214	57,129
Available-for-sale Securities	114,278	58,495
Collateralized Mortgage Backed Securities [Member] | CMO's [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	120,238	137,787
Available-for-sale Securities	120,475	135,073
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	12,650
Available-for-sale Securities	12,996
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	12,650
Available-for-sale Securities	12,996
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	619,359
Available-for-sale Securities	638,728
Held-to-maturity, Amortized cost	610,384
Held to maturity Fair Value	618,505
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	389,907
Available-for-sale Securities	403,975
Held-to-maturity, Amortized cost	610,384
Held to maturity Fair Value	618,505
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	109,214
Available-for-sale Securities	114,278
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	120,238
Available-for-sale Securities	120,475
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Investment Securities
Schedule of Investments [Line Items]
Available for sale Amortized Cost	13,289	25,367
Available-for-sale Securities	12,578	21,396
Held-to-maturity, Amortized cost		25,032
Held to maturity Fair Value	25,025	24,961
Investment Securities | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Held-to-maturity, Amortized cost	25,015	25,032
Held to maturity Fair Value	25,025	24,961
Investment Securities | Obligation of US Government sponsored agencies at loss [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	4,468	5,122
Available-for-sale Securities	4,502	5,093
Investment Securities | Obligation of Puerto Rico Government and political subdivisions [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	6,720	17,801
Available-for-sale Securities	5,848	13,731
Investment Securities | Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	2,101	2,444
Available-for-sale Securities	2,228	$ 2,572
Investment Securities | Maturities Due From One To Five Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	6,720
Available-for-sale Securities	5,848
Held-to-maturity, Amortized cost	25,015
Held to maturity Fair Value	25,025
Investment Securities | Maturities Due From One To Five Years [Member] | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	0
Available-for-sale Securities	0
Held-to-maturity, Amortized cost	25,015
Held to maturity Fair Value	25,025
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
Available-for-sale Securities	5,848
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	6,569
Available-for-sale Securities	6,730
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	4,468
Available-for-sale Securities	4,502
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Investment Securities | Maturities Due From Five To Ten Years [Member] | Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	2,101
Available-for-sale Securities	2,228
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	$ 0

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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