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Investment Securities (Investment securities by contractual maturity) (Details) - USD ($) | Jun. 30, 2017 | Dec. 31, 2016
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Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 649,280,000 | $ 749,867,000
Available-for-sale Securities | 649,327,000 | 751,484,000
Held-to-maturity, Amortized cost | 555,407,000 | 599,884,000
Held to maturity Fair Value | 549,595,000 | 592,763,000
Maturities Due From One To Five Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 26,074,000 |
Available-for-sale Securities | 25,747,000 |
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 | 141,882,000 |
Available-for-sale Securities | 141,189,000 |
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 | 436,232,000 |
Available-for-sale Securities | 437,296,000 |
Held-to-maturity, Amortized cost | 555,407,000 |
Held to maturity Fair Value | 549,595,000 |
Collateralized Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 584,548,000 | 689,772,000
Available-for-sale Securities | 584,931,000 | 692,552,000
Held-to-maturity, Amortized cost | 555,407,000 | 599,884,000
Held to maturity Fair Value | 549,595,000 | 592,763,000
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 346,388,000 | 422,168,000
Available-for-sale Securities | 346,693,000 | 425,486,000
Held-to-maturity, Amortized cost | 555,407,000 | 599,884,000
Held to maturity Fair Value | 549,595,000 | 592,763,000
Collateralized Mortgage Backed Securities [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 145,538,000 | 163,614,000
Available-for-sale Securities | 146,684,000 | 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 | 92,622,000 | 103,990,000
Available-for-sale Securities | 91,554,000 | 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 | 8,102,000 |
Available-for-sale Securities | 8,185,000 |
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 | 8,102,000 |
Available-for-sale Securities | 8,185,000 |
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] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 140,214,000 |
Available-for-sale Securities | 139,450,000 |
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 | 69,364,000 |
Available-for-sale Securities | 69,403,000 |
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 | 70,850,000 |
Available-for-sale Securities | 70,047,000 |
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 | 436,232,000 |
Available-for-sale Securities | 437,296,000 |
Held-to-maturity, Amortized cost | 555,407,000 |
Held to maturity Fair Value | 549,595,000 |
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 | 268,922,000 |
Available-for-sale Securities | 269,105,000 |
Held-to-maturity, Amortized cost | 555,407,000 |
Held to maturity Fair Value | 549,595,000 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 145,538,000 |
Available-for-sale Securities | 146,684,000 |
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 | 21,772,000 |
Available-for-sale Securities | 21,507,000 |
Held-to-maturity, Amortized cost | 0 |
Held to maturity Fair Value | 0 |
Investment Securities |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 64,732,000 | 60,095,000
Available-for-sale Securities | 64,396,000 | 58,932,000
Investment Securities | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 55,031,000 | 49,672,000
Available-for-sale Securities | 54,990,000 | 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 | 3,353,000 | 3,903,000
Available-for-sale Securities | 3,326,000 | 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 | 4,680,000 | 4,680,000
Available-for-sale Securities | 4,341,000 | 4,073,000
Held-to-maturity, Amortized cost | 0 |
Held to maturity Fair Value | 0 |
Investment Securities | Other Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 1,668,000 | 1,840,000
Available-for-sale Securities | 1,739,000 | $ 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 | 45,092,000 |
Available-for-sale Securities | 45,095,000 |
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 | 45,092,000 |
Available-for-sale Securities | 45,095,000 |
Held-to-maturity, Amortized cost | 0 |
Held to maturity Fair Value | 0 |
Investment Securities | Maturities Due In Less Than One Year [Member] | Obligation of US Government sponsored agencies at loss [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 0 |
Available-for-sale Securities | 0 |
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 | 17,972,000 |
Available-for-sale Securities | 17,562,000 |
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 | 9,939,000 |
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 | 3,353,000 |
Available-for-sale Securities | 3,326,000 |
Held-to-maturity, Amortized cost | 0 |
Held to maturity Fair Value | 0 |
Investment Securities | Maturities Due From One To Five Years [Member] | Obligation of Puerto Rico Government and political subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 4,680,000 |
Available-for-sale Securities | 4,341,000 |
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 | 1,668,000 |
Available-for-sale Securities | 1,739,000 |
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 | 1,668,000 |
Available-for-sale Securities | 1,739,000 |
Held-to-maturity, Amortized cost | 0 |
Held to maturity Fair Value | $ 0 |

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