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Investment Securities (Investment securities by contractual maturity) (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Schedule of Investments [Line Items]
Available for sale Amortized Cost	$ 611,936,000	$ 749,867,000
Available-for-sale Securities	613,423,000	751,484,000
Held-to-maturity, Amortized cost	530,178,000	599,884,000
Held to maturity Fair Value	525,830,000	592,763,000
Maturities Due From One To Five Years [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	20,226,000
Available-for-sale Securities	20,233,000
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	211,205,000
Available-for-sale Securities	209,731,000
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	377,726,000
Available-for-sale Securities	380,930,000
Held-to-maturity, Amortized cost	530,178,000
Held to maturity Fair Value	525,830,000
Collateralized Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	594,479,000	689,772,000
Available-for-sale Securities	596,223,000	692,552,000
Held-to-maturity, Amortized cost	530,178,000	599,884,000
Held to maturity Fair Value	525,830,000	592,763,000
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	344,581,000	422,168,000
Available-for-sale Securities	345,583,000	425,486,000
Held-to-maturity, Amortized cost	530,178,000	599,884,000
Held to maturity Fair Value	525,830,000	592,763,000
Collateralized Mortgage Backed Securities [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	162,993,000	163,614,000
Available-for-sale Securities	164,767,000	165,235,000
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	86,905,000	103,990,000
Available-for-sale Securities	85,873,000	101,831,000
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	7,160,000
Available-for-sale Securities	7,246,000
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	7,160,000
Available-for-sale Securities	7,246,000
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	209,593,000
Available-for-sale Securities	208,047,000
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	132,716,000
Available-for-sale Securities	132,163,000
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	76,877,000
Available-for-sale Securities	75,884,000
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	377,726,000
Available-for-sale Securities	380,930,000
Held-to-maturity, Amortized cost	530,178,000
Held to maturity Fair Value	525,830,000
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	204,705,000
Available-for-sale Securities	206,174,000
Held-to-maturity, Amortized cost	530,178,000
Held to maturity Fair Value	525,830,000
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | GNMA [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	162,993,000
Available-for-sale Securities	164,767,000
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	10,028,000
Available-for-sale Securities	9,989,000
Held-to-maturity, Amortized cost	0
Held to maturity Fair Value	0
Investment Securities
Schedule of Investments [Line Items]
Available for sale Amortized Cost	17,457,000	60,095,000
Available-for-sale Securities	17,200,000	58,932,000
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	10,269,000	49,672,000
Available-for-sale Securities	10,218,000	49,054,000
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	3,121,000	3,903,000
Available-for-sale Securities	3,092,000	3,884,000
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	4,680,000
Available-for-sale Securities	2,206,000	4,073,000
Investment Securities | Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale Amortized Cost	1,612,000	1,840,000
Available-for-sale Securities	1,684,000	$ 1,921,000
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	2,779,000
Available-for-sale Securities	2,529,000
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	324,000
Available-for-sale Securities	323,000
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	2,206,000
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	13,066,000
Available-for-sale Securities	12,987,000
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	9,945,000
Available-for-sale Securities	9,895,000
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	3,121,000
Available-for-sale Securities	3,092,000
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	1,612,000
Available-for-sale Securities	1,684,000
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	1,612,000
Available-for-sale Securities	1,684,000
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
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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