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Investment Securities (Investment securities by contractual maturity) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Investments [Line Items]
Available for sale Amortized Cost	$ 955,646	$ 1,187,679
Available-for-sale Securities	974,609	1,216,538
Held-to-maturity, Amortized cost	620,189	162,752
Held to maturity Fair Value	614,679	164,154
Maturities Due From One To Five Years [Member]
Schedule of Investments [Line Items]
Held-to-maturity, Amortized cost	25,032
Held to maturity Fair Value	24,961
Collateralized Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	930,279	1,156,455
Available-for-sale Securities	953,213	1,190,391
Held-to-maturity, Amortized cost	595,157
Held to maturity Fair Value	589,718
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	735,363	972,836
Available-for-sale Securities	759,645	1,009,509
Held-to-maturity, Amortized cost	595,157	162,752
Held to maturity Fair Value	589,718	164,154
Collateralized Mortgage Backed Securities [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	57,129	4,473
Available-for-sale Securities	58,495	4,753
Collateralized Mortgage Backed Securities [Member] | CMO's [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	137,787	179,146
Available-for-sale Securities	135,073	176,129
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	15,098
Available-for-sale Securities	15,228
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	15,098
Available-for-sale Securities	15,228
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	915,181
Available-for-sale Securities	937,985
Held-to-maturity, Amortized cost	595,157
Held to maturity Fair Value	589,718
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	720,265
Available-for-sale Securities	744,417
Held-to-maturity, Amortized cost	595,157
Held to maturity Fair Value	589,718
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	57,129
Available-for-sale Securities	58,495
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	137,787
Available-for-sale Securities	135,073
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Investment Securities
Schedule of Investments [Line Items]
Available for sale Amortized Cost	25,367	31,224
Available-for-sale Securities	21,396	26,147
Held-to-maturity, Amortized cost	25,032
Held to maturity Fair Value	24,961
Investment Securities | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Held-to-maturity, Amortized cost	25,032
Held to maturity Fair Value	24,961
Investment Securities | Obligation of US Government sponsored agencies at loss [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	5,122	7,148
Available-for-sale Securities	5,093	7,181
Investment Securities | Obligation of Puerto Rico Government and political subdivisions [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	17,801	20,939
Available-for-sale Securities	13,731	15,672
Investment Securities | Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	2,444	3,137
Available-for-sale Securities	2,572	$ 3,294
Investment Securities | Maturities Due From One To Five Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	8,733
Available-for-sale Securities	7,438
Held-to-maturity, Amortized cost	25,032
Held to maturity Fair Value	24,961
Investment Securities | Maturities Due From One To Five Years [Member] | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Held-to-maturity, Amortized cost	25,032
Held to maturity Fair Value	24,961
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	8,733
Available-for-sale Securities	7,438
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	5,122
Available-for-sale Securities	5,093
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	5,122
Available-for-sale Securities	5,093
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Investment Securities | Maturities Due After Ten Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	11,512
Available-for-sale Securities	8,865
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Investment Securities | Maturities Due After Ten Years [Member] | Obligation of Puerto Rico Government and political subdivisions [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	9,068
Available-for-sale Securities	6,293
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Investment Securities | Maturities Due After Ten Years [Member] | Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	2,444
Available-for-sale Securities	2,572
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
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