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Investment Securities (Investment securities by contractual maturity) (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Schedule of Investments [Line Items]
Available for sale Amortized Cost	$ 890,308,000	$ 648,800,000
Available-for-sale Securities	872,341,000	645,797,000
Held-to-maturity, Amortized cost	465,427,000	506,064,000
Held to maturity Fair Value	447,947,000	497,681,000
Maturities Due From One To Five Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	17,493,000
Available-for-sale Securities	17,177,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Maturities Due From Five To Ten Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	294,561,000
Available-for-sale Securities	287,075,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Maturities Due After Ten Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	575,153,000
Available-for-sale Securities	564,988,000
Held-to-maturity, Amortized cost	465,427,000
Held to maturity Fair Value	447,947,000
Collateralized Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	873,426,000	631,656,000
Available-for-sale Securities	855,686,000	629,124,000
Held-to-maturity, Amortized cost	465,427,000	506,064,000
Held to maturity Fair Value	447,947,000	497,681,000
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	600,978,000	383,194,000
Available-for-sale Securities	589,673,000	381,715,000
Held-to-maturity, Amortized cost	465,427,000	506,064,000
Held to maturity Fair Value	447,947,000	497,681,000
Collateralized Mortgage Backed Securities [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	198,301,000	166,436,000
Available-for-sale Securities	194,858,000	167,338,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Collateralized Mortgage Backed Securities [Member] | CMO's [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	74,147,000	82,026,000
Available-for-sale Securities	71,155,000	80,071,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Collateralized Mortgage Backed Securities [Member] | Maturities Due From One To Five Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	4,907,000
Available-for-sale Securities	4,833,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
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	4,907,000
Available-for-sale Securities	4,833,000
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]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	293,366,000
Available-for-sale Securities	285,865,000
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	227,886,000
Available-for-sale Securities	223,185,000
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] | CMO's [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	65,480,000
Available-for-sale Securities	62,680,000
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	575,153,000
Available-for-sale Securities	564,988,000
Held-to-maturity, Amortized cost	465,427,000
Held to maturity Fair Value	447,947,000
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	368,185,000
Available-for-sale Securities	361,655,000
Held-to-maturity, Amortized cost	465,427,000
Held to maturity Fair Value	447,947,000
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	198,301,000
Available-for-sale Securities	194,858,000
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	8,667,000
Available-for-sale Securities	8,475,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Investment Securities
Schedule of Investments [Line Items]
Available for sale Amortized Cost	16,882,000	17,144,000
Available-for-sale Securities	16,655,000	16,673,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Investment Securities | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	10,610,000	10,276,000
Available-for-sale Securities	10,449,000	10,163,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Investment Securities | Obligation of US Government sponsored agencies at loss [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	2,622,000	2,927,000
Available-for-sale Securities	2,541,000	2,879,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Investment Securities | Obligation of Puerto Rico Government and political subdivisions [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	2,455,000	2,455,000
Available-for-sale Securities	2,455,000	2,093,000
Investment Securities | Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	1,195,000	1,486,000
Available-for-sale Securities	1,210,000	$ 1,538,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Investment Securities | Maturities Due In Less Than One Year [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	3,101,000
Available-for-sale Securities	3,101,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Investment Securities | Maturities Due In Less Than One Year [Member] | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	646,000
Available-for-sale Securities	646,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Investment Securities | Maturities Due In Less Than One Year [Member] | Obligation of Puerto Rico Government and political subdivisions [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	2,455,000
Available-for-sale Securities	2,455,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Investment Securities | Maturities Due From One To Five Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	12,586,000
Available-for-sale Securities	12,344,000
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	9,964,000
Available-for-sale Securities	9,803,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Investment Securities | Maturities Due From One To Five Years [Member] | Obligation of US Government sponsored agencies at loss [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	2,622,000
Available-for-sale Securities	2,541,000
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	1,195,000
Available-for-sale Securities	1,210,000
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	1,195,000
Available-for-sale Securities	1,210,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	$ 0

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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