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Investment Securities (Investment securities by contractual maturity) (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Schedule of Investments [Line Items]
Available for sale Amortized Cost	$ 815,970,000	$ 648,800,000
Available-for-sale Securities	801,641,000	645,797,000
Held-to-maturity, Amortized cost	485,143,000	506,064,000
Held to maturity Fair Value	467,980,000	497,681,000
Maturities Due From One To Five Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	18,382,000
Available-for-sale Securities	18,101,000
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	286,517,000
Available-for-sale Securities	280,363,000
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	508,294,000
Available-for-sale Securities	500,443,000
Held-to-maturity, Amortized cost	485,143,000
Held to maturity Fair Value	467,980,000
Collateralized Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	799,059,000	631,656,000
Available-for-sale Securities	784,972,000	629,124,000
Held-to-maturity, Amortized cost	485,143,000	506,064,000
Held to maturity Fair Value	467,980,000	497,681,000
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	538,900,000	383,194,000
Available-for-sale Securities	530,095,000	381,715,000
Held-to-maturity, Amortized cost	485,143,000	506,064,000
Held to maturity Fair Value	467,980,000	497,681,000
Collateralized Mortgage Backed Securities [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	182,055,000	166,436,000
Available-for-sale Securities	179,502,000	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	78,104,000	82,026,000
Available-for-sale Securities	75,375,000	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	5,651,000
Available-for-sale Securities	5,598,000
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	5,651,000
Available-for-sale Securities	5,598,000
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	285,114,000
Available-for-sale Securities	278,931,000
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	216,028,000
Available-for-sale Securities	212,418,000
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	69,086,000
Available-for-sale Securities	66,513,000
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	508,294,000
Available-for-sale Securities	500,443,000
Held-to-maturity, Amortized cost	485,143,000
Held to maturity Fair Value	467,980,000
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	317,221,000
Available-for-sale Securities	312,079,000
Held-to-maturity, Amortized cost	485,143,000
Held to maturity Fair Value	467,980,000
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	182,055,000
Available-for-sale Securities	179,502,000
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	9,018,000
Available-for-sale Securities	8,862,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Investment Securities
Schedule of Investments [Line Items]
Available for sale Amortized Cost	16,911,000	17,144,000
Available-for-sale Securities	16,669,000	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	10,280,000	10,276,000
Available-for-sale Securities	10,124,000	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	2,773,000	2,927,000
Available-for-sale Securities	2,701,000	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	2,412,000	2,093,000
Investment Securities | Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	1,403,000	1,486,000
Available-for-sale Securities	1,432,000	$ 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	2,777,000
Available-for-sale Securities	2,734,000
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	322,000
Available-for-sale Securities	322,000
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	2,412,000
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	12,731,000
Available-for-sale Securities	12,503,000
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	9,958,000
Available-for-sale Securities	9,802,000
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	2,773,000
Available-for-sale Securities	2,701,000
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	1,403,000
Available-for-sale Securities	1,432,000
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	1,403,000
Available-for-sale Securities	1,432,000
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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Topic 320
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