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Investment Securities (Investment securities by contractual maturity) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Schedule of Investments [Line Items]
Available for sale Amortized Cost	$ 623,994	$ 955,646
Available-for-sale Securities	642,683	974,609
Held-to-maturity, Amortized cost	641,890	620,189
Held to maturity Fair Value	650,023	614,679
Collateralized Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	613,238	930,279
Available-for-sale Securities	632,428	953,213
Held-to-maturity, Amortized cost	616,883	595,157
Held to maturity Fair Value	625,006	589,718
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	376,242	735,363
Available-for-sale Securities	389,607	759,645
Held-to-maturity, Amortized cost	616,883	595,157
Held to maturity Fair Value	625,006	589,718
Collateralized Mortgage Backed Securities [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	125,188	57,129
Available-for-sale Securities	130,985	58,495
Collateralized Mortgage Backed Securities [Member] | CMO's [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	111,808	137,787
Available-for-sale Securities	111,836	135,073
Collateralized Mortgage Backed Securities [Member] | Maturities Due From One To Five Years [Member] | FNMA and FHLMC [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	11,294
Available-for-sale Securities	11,629
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]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	29,417
Available-for-sale Securities	30,082
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	27,173
Available-for-sale Securities	27,837
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] | CMO's [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	2,244
Available-for-sale Securities	2,245
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	572,527
Available-for-sale Securities	590,717
Held-to-maturity, Amortized cost	616,883
Held to maturity Fair Value	625,006
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	337,775
Available-for-sale Securities	350,141
Held-to-maturity, Amortized cost	616,883
Held to maturity Fair Value	625,006
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	125,188
Available-for-sale Securities	130,985
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	109,564
Available-for-sale Securities	109,591
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Investment Securities
Schedule of Investments [Line Items]
Available for sale Amortized Cost	10,756	25,367
Available-for-sale Securities	10,255	21,396
Held-to-maturity, Amortized cost	25,007	25,032
Held to maturity Fair Value	25,017	24,961
Investment Securities | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Held-to-maturity, Amortized cost	25,007	25,032
Held to maturity Fair Value	25,017	24,961
Investment Securities | Obligation of US Government sponsored agencies at loss [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	4,170	5,122
Available-for-sale Securities	4,165	5,093
Investment Securities | Obligation of Puerto Rico Government and political subdivisions [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	4,680	17,801
Available-for-sale Securities	4,073	13,731
Investment Securities | Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	1,906	2,444
Available-for-sale Securities	2,017	$ 2,572
Investment Securities | Maturities Due From One To Five Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	4,680
Available-for-sale Securities	4,073
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
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	0
Held to maturity Fair Value	0
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	4,680
Available-for-sale Securities	4,073
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	6,076
Available-for-sale Securities	6,182
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	4,170
Available-for-sale Securities	4,165
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	1,906
Available-for-sale Securities	2,017
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
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+ References

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