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Investment Securities (Investment securities) (Details) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
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Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 872,895,000 | $ 648,800,000
Available-for-sale Securities, Gross Unrealized Gains | 327,000 | 2,940,000
Available-for-sale Securities, Gross Unrealized Losses | 24,670,000 | 5,943,000
Available-for-sale Securities | $ 848,552,000 | $ 645,797,000
Available for sale - Weighted Average Yield | 2.62% | 2.46%
Held-to-maturity, Amortized cost | $ 444,679,000 | $ 506,064,000
Held to maturity Securities Unrecognized Gains | 0 | 0
Held-to-maturity Securities, Unrecognized Loss | 19,613,000 | 8,383,000
Held to maturity Fair Value | $ 425,066,000 | $ 497,681,000
Held to maturity - Weighted Average Yield | 2.07% | 2.07%
Total Securities - Amortized Cost | $ 1,317,574,000 | $ 1,154,864,000
Total Securities Gross Unrealized Gains | 327,000 | 2,940,000
Total Securities Gross Unrealized Losses | 44,283,000 | 14,326,000
Total Securities Fair Value | $ 1,273,618,000 | $ 1,143,478,000
Marketable Securities Weighted Average Yield | 2.44% | 2.29%
Collateralized Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 858,642,000 | $ 631,656,000
Available-for-sale Securities, Gross Unrealized Gains | 320,000 | 2,888,000
Available-for-sale Securities, Gross Unrealized Losses | 24,424,000 | 5,420,000
Available-for-sale Securities | $ 834,538,000 | $ 629,124,000
Available for sale - Weighted Average Yield | 2.64% | 2.47%
Held-to-maturity, Amortized cost | $ 444,679,000 | $ 506,064,000
Held to maturity Securities Unrecognized Gains | 0 | 0
Held-to-maturity Securities, Unrecognized Loss | 19,613,000 | 8,383,000
Held to maturity Fair Value | $ 425,066,000 | $ 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 | $ 586,097,000 | $ 383,194,000
Available-for-sale Securities, Gross Unrealized Gains | 20,000 | 1,402,000
Available-for-sale Securities, Gross Unrealized Losses | 15,799,000 | 2,881,000
Available-for-sale Securities | $ 570,318,000 | $ 381,715,000
Available for sale - Weighted Average Yield | 2.59% | 2.39%
Held-to-maturity, Amortized cost | $ 444,679,000 | $ 506,064,000
Held to maturity Securities Unrecognized Gains | 0 | 0
Held-to-maturity Securities, Unrecognized Loss | 19,613,000 | 8,383,000
Held to maturity Fair Value | $ 425,066,000 | $ 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 | $ 202,585,000 | $ 166,436,000
Available-for-sale Securities, Gross Unrealized Gains | 300,000 | 1,486,000
Available-for-sale Securities, Gross Unrealized Losses | 5,431,000 | 584,000
Available-for-sale Securities | $ 197,454,000 | $ 167,338,000
Available for sale - Weighted Average Yield | 3.06% | 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 | 69,960,000 | $ 82,026,000
Available-for-sale Securities, Gross Unrealized Gains | 0 | 0
Available-for-sale Securities, Gross Unrealized Losses | 3,194,000 | 1,955,000
Available-for-sale Securities | $ 66,766,000 | $ 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 | 14,253,000 | $ 17,144,000
Available-for-sale Securities, Gross Unrealized Gains | 7,000 | 52,000
Available-for-sale Securities, Gross Unrealized Losses | 246,000 | 523,000
Available-for-sale Securities | $ 14,014,000 | $ 16,673,000
Available for sale - Weighted Average Yield | 1.46% | 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 | 10,617,000 | $ 10,276,000
Available-for-sale Securities, Gross Unrealized Gains | 0 | 0
Available-for-sale Securities, Gross Unrealized Losses | 157,000 | 113,000
Available-for-sale Securities | $ 10,460,000 | $ 10,163,000
Available for sale - Weighted Average Yield | 1.32% | 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 | 2,484,000 | $ 2,927,000
Available-for-sale Securities, Gross Unrealized Gains | 0 | 0
Available-for-sale Securities, Gross Unrealized Losses | 89,000 | 48,000
Available-for-sale Securities | $ 2,395,000 | $ 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 | 0 | $ 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 | $ 0 | $ 2,093,000
Available for sale - Weighted Average Yield | 0.00% | 5.55%
Securities Investment [Member] | Other Debt Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 1,152,000 | $ 1,486,000
Available-for-sale Securities, Gross Unrealized Gains | 7,000 | 52,000
Available-for-sale Securities, Gross Unrealized Losses | 0 | 0
Available-for-sale Securities | $ 1,159,000 | $ 1,538,000
Available for sale - Weighted Average Yield | 2.99% | 2.97%
Held-to-maturity, Amortized cost | $ 0 |
Held to maturity Fair Value | $ 0 |

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