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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 |

X
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