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Investment Securities (Investment securities) (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
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Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 890,308,000 | $ 648,800,000
Available-for-sale Securities, Gross Unrealized Gains | 740,000 | 2,940,000
Available-for-sale Securities, Gross Unrealized Losses | 18,707,000 | 5,943,000
Available-for-sale Securities | $ 872,341,000 | $ 645,797,000
Available for sale - Weighted Average Yield | 2.61% | 2.46%
Held-to-maturity, Amortized cost | $ 465,427,000 | $ 506,064,000
Held to maturity Securities Unrecognized Gains | 0 | 0
Held-to-maturity Securities, Unrecognized Loss | 17,480,000 | 8,383,000
Held to maturity Fair Value | $ 447,947,000 | $ 497,681,000
Held to maturity - Weighted Average Yield | 2.07% | 2.07%
Total Securities - Amortized Cost | $ 1,355,735,000 | $ 1,154,864,000
Total Securities Gross Unrealized Gains | 740,000 | 2,940,000
Total Securities Gross Unrealized Losses | 36,187,000 | 14,326,000
Total Securities Fair Value | $ 1,320,288,000 | $ 1,143,478,000
Marketable Securities Weighted Average Yield | 2.43% | 2.29%
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, Gross Unrealized Gains | 725,000 | 2,888,000
Available-for-sale Securities, Gross Unrealized Losses | 18,465,000 | 5,420,000
Available-for-sale Securities | $ 855,686,000 | $ 629,124,000
Available for sale - Weighted Average Yield | 2.62% | 2.47%
Held-to-maturity, Amortized cost | $ 465,427,000 | $ 506,064,000
Held to maturity Securities Unrecognized Gains | 0 | 0
Held-to-maturity Securities, Unrecognized Loss | 17,480,000 | 8,383,000
Held to maturity Fair Value | $ 447,947,000 | $ 497,681,000
Held to maturity - Weighted Average Yield | 2.07% | 2.07%
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, Gross Unrealized Gains | 266,000 | 1,402,000
Available-for-sale Securities, Gross Unrealized Losses | 11,571,000 | 2,881,000
Available-for-sale Securities | $ 589,673,000 | $ 381,715,000
Available for sale - Weighted Average Yield | 2.58% | 2.39%
Held-to-maturity, Amortized cost | $ 465,427,000 | $ 506,064,000
Held to maturity Securities Unrecognized Gains | 0 | 0
Held-to-maturity Securities, Unrecognized Loss | 17,480,000 | 8,383,000
Held to maturity Fair Value | $ 447,947,000 | $ 497,681,000
Held to maturity - Weighted Average Yield | 2.07% | 2.07%
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, Gross Unrealized Gains | 459,000 | 1,486,000
Available-for-sale Securities, Gross Unrealized Losses | 3,902,000 | 584,000
Available-for-sale Securities | $ 194,858,000 | $ 167,338,000
Available for sale - Weighted Average Yield | 3.03% | 2.94%
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, Gross Unrealized Gains | 0 | 0
Available-for-sale Securities, Gross Unrealized Losses | 2,992,000 | 1,955,000
Available-for-sale Securities | $ 71,155,000 | $ 80,071,000
Available for sale - Weighted Average Yield | 1.90% | 1.90%
Held-to-maturity, Amortized cost | $ 0 |
Held to maturity Fair Value | 0 |
Securities Investment [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 16,882,000 | $ 17,144,000
Available-for-sale Securities, Gross Unrealized Gains | 15,000 | 52,000
Available-for-sale Securities, Gross Unrealized Losses | 242,000 | 523,000
Available-for-sale Securities | $ 16,655,000 | $ 16,673,000
Available for sale - Weighted Average Yield | 2.05% | 2.04%
Held-to-maturity, Amortized cost | $ 0 |
Held to maturity Fair Value | 0 |
Securities Investment [Member] | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 10,610,000 | $ 10,276,000
Available-for-sale Securities, Gross Unrealized Gains | 0 | 0
Available-for-sale Securities, Gross Unrealized Losses | 161,000 | 113,000
Available-for-sale Securities | $ 10,449,000 | $ 10,163,000
Available for sale - Weighted Average Yield | 1.30% | 1.25%
Held-to-maturity, Amortized cost | $ 0 |
Held to maturity Fair Value | 0 |
Securities Investment [Member] | 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, Gross Unrealized Gains | 0 | 0
Available-for-sale Securities, Gross Unrealized Losses | 81,000 | 48,000
Available-for-sale Securities | $ 2,541,000 | $ 2,879,000
Available for sale - Weighted Average Yield | 1.38% | 1.38%
Held-to-maturity, Amortized cost | $ 0 |
Held to maturity Fair Value | 0 |
Securities Investment [Member] | 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, Gross Unrealized Gains | 0 | 0
Available-for-sale Securities, Gross Unrealized Losses | 0 | 362,000
Available-for-sale Securities | $ 2,455,000 | $ 2,093,000
Available for sale - Weighted Average Yield | 5.55% | 5.55%
Securities Investment [Member] | Other Debt Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 1,195,000 | $ 1,486,000
Available-for-sale Securities, Gross Unrealized Gains | 15,000 | 52,000
Available-for-sale Securities, Gross Unrealized Losses | 0 | 0
Available-for-sale Securities | $ 1,210,000 | $ 1,538,000
Available for sale - Weighted Average Yield | 2.95% | 2.97%
Held-to-maturity, Amortized cost | $ 0 |
Held to maturity Fair Value | $ 0 |

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