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Investment Securities (Investment securities by contractual maturity) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Investments [Line Items]
Available for sale Amortized Cost	$ 982,754	$ 1,187,679
Available-for-sale Securities	1,007,705	1,216,538
Held-to-maturity, Amortized cost	594,639	162,752
Held to maturity Fair Value	595,148	164,154
Maturities Due From One To Five Years [Member]
Schedule of Investments [Line Items]
Held-to-maturity, Amortized cost	25,040
Held to maturity Fair Value	25,053
Collateralized Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	955,602	1,156,455
Available-for-sale Securities	985,554	1,190,391
Held-to-maturity, Amortized cost	569,599
Held to maturity Fair Value	570,095
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	777,412	972,836
Available-for-sale Securities	807,801	1,009,509
Held-to-maturity, Amortized cost	569,599	162,752
Held to maturity Fair Value	570,095	164,154
Collateralized Mortgage Backed Securities [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	30,854	4,473
Available-for-sale Securities	31,929	4,753
Collateralized Mortgage Backed Securities [Member] | CMO's [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	147,336	179,146
Available-for-sale Securities	145,824	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	16,410
Available-for-sale Securities	16,772
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	16,410
Available-for-sale Securities	16,772
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	939,192
Available-for-sale Securities	968,782
Held-to-maturity, Amortized cost	569,599
Held to maturity Fair Value	570,095
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	761,002
Available-for-sale Securities	791,029
Held-to-maturity, Amortized cost	569,599
Held to maturity Fair Value	570,095
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	30,854
Available-for-sale Securities	31,929
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	147,336
Available-for-sale Securities	145,824
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Investment Securities
Schedule of Investments [Line Items]
Available for sale Amortized Cost	27,152	31,224
Available-for-sale Securities	22,151	26,147
Held-to-maturity, Amortized cost	25,040
Held to maturity Fair Value	25,053
Investment Securities | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Held-to-maturity, Amortized cost	25,040
Held to maturity Fair Value	25,053
Investment Securities | Obligation of US Government sponsored agencies at loss [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	5,572	7,148
Available-for-sale Securities	5,603	7,181
Investment Securities | Obligation of Puerto Rico Government and political subdivisions [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	18,987	20,939
Available-for-sale Securities	13,793	15,672
Investment Securities | Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	2,593	3,137
Available-for-sale Securities	2,755	$ 3,294
Investment Securities | Maturities Due From One To Five Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	8,766
Available-for-sale Securities	7,341
Held-to-maturity, Amortized cost	25,040
Held to maturity Fair Value	25,053
Investment Securities | Maturities Due From One To Five Years [Member] | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Held-to-maturity, Amortized cost	25,040
Held to maturity Fair Value	25,053
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	8,766
Available-for-sale Securities	7,341
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	5,572
Available-for-sale Securities	5,603
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	5,572
Available-for-sale Securities	5,603
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	12,814
Available-for-sale Securities	9,207
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	10,221
Available-for-sale Securities	6,452
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	2,593
Available-for-sale Securities	2,755
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	$ 0

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- Definition

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