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Investment Securities (Investment securities by contractual maturity) (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Schedule of Investments [Line Items]
Available for sale Amortized Cost	$ 854,511,000	$ 648,800,000
Available-for-sale Securities	841,857,000	645,797,000
Held-to-maturity, Amortized cost	424,740,000	506,064,000
Held to maturity Fair Value	410,353,000	497,681,000
Maturities Due From One To Five Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	6,042,000
Available-for-sale Securities	5,935,000
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	312,775,000
Available-for-sale Securities	307,132,000
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	524,770,000
Available-for-sale Securities	517,985,000
Held-to-maturity, Amortized cost	424,740,000
Held to maturity Fair Value	410,353,000
Collateralized Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	840,055,000	631,656,000
Available-for-sale Securities	827,565,000	629,124,000
Held-to-maturity, Amortized cost	424,740,000	506,064,000
Held to maturity Fair Value	410,353,000	497,681,000
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	561,878,000	383,194,000
Available-for-sale Securities	553,331,000	381,715,000
Held-to-maturity, Amortized cost	424,740,000	506,064,000
Held to maturity Fair Value	410,353,000	497,681,000
Collateralized Mortgage Backed Securities [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	211,947,000	166,436,000
Available-for-sale Securities	210,170,000	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	66,230,000	82,026,000
Available-for-sale Securities	64,064,000	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	3,617,000
Available-for-sale Securities	3,570,000
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	3,617,000
Available-for-sale Securities	3,570,000
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	311,668,000
Available-for-sale Securities	306,010,000
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	253,447,000
Available-for-sale Securities	249,808,000
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	58,221,000
Available-for-sale Securities	56,202,000
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	524,770,000
Available-for-sale Securities	517,985,000
Held-to-maturity, Amortized cost	424,740,000
Held to maturity Fair Value	410,353,000
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	304,814,000
Available-for-sale Securities	299,953,000
Held-to-maturity, Amortized cost	424,740,000
Held to maturity Fair Value	410,353,000
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	211,947,000
Available-for-sale Securities	210,170,000
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	8,009,000
Available-for-sale Securities	7,862,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Investment Securities
Schedule of Investments [Line Items]
Available for sale Amortized Cost	14,456,000	17,144,000
Available-for-sale Securities	14,292,000	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	10,924,000	10,276,000
Available-for-sale Securities	10,805,000	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	2,325,000	2,927,000
Available-for-sale Securities	2,265,000	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	0	2,455,000
Available-for-sale Securities	0	2,093,000
Investment Securities | Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	1,207,000	1,486,000
Available-for-sale Securities	1,222,000	$ 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	10,924,000
Available-for-sale Securities	10,805,000
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	10,924,000
Available-for-sale Securities	10,805,000
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	2,425,000
Available-for-sale Securities	2,365,000
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	2,325,000
Available-for-sale Securities	2,265,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Investment Securities | Maturities Due From One To Five Years [Member] | Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	100,000
Available-for-sale Securities	100,000
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	1,107,000
Available-for-sale Securities	1,122,000
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	1,107,000
Available-for-sale Securities	1,122,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	$ 0

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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