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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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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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