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Investment Securities (Investment securities) (Details) - USD ($) | Sep. 30, 2017 | Dec. 31, 2016
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Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 611,936,000 | $ 749,867,000
Available-for-sale Securities, Gross Unrealized Gains | 4,739,000 | 8,740,000
Available-for-sale Securities, Gross Unrealized Losses | 3,252,000 | 7,123,000
Available-for-sale Securities | $ 613,423,000 | $ 751,484,000
Available for sale - Weighted Average Yield | 2.44% | 2.53%
Held-to-maturity, Amortized cost | $ 530,178,000 | $ 599,884,000
Held to maturity Securities Unrecognized Gains | 367,000 | 145,000
Held-to-maturity Securities, Unrecognized Loss | 4,715,000 | 7,266,000
Held to maturity Fair Value | $ 525,830,000 | $ 592,763,000
Held to maturity - Weighted Average Yield | 2.09% | 2.15%
Total Securities - Amortized Cost | $ 1,142,114,000 | $ 1,349,751,000
Total Securities Gross Unrealized Gains | 5,106,000 | 8,885,000
Total Securities Gross Unrealized Losses | 7,967,000 | 14,389,000
Total Securities Fair Value | $ 1,139,253,000 | $ 1,344,247,000
Marketable Securities Weighted Average Yield | 2.28% | 2.36%
Collateralized Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 594,479,000 | $ 689,772,000
Available-for-sale Securities, Gross Unrealized Gains | 4,667,000 | 8,659,000
Available-for-sale Securities, Gross Unrealized Losses | 2,923,000 | 5,879,000
Available-for-sale Securities | $ 596,223,000 | $ 692,552,000
Available for sale - Weighted Average Yield | 2.45% | 2.57%
Held-to-maturity, Amortized cost | $ 530,178,000 | $ 599,884,000
Held to maturity Securities Unrecognized Gains | 367,000 | 145,000
Held-to-maturity Securities, Unrecognized Loss | 4,715,000 | 7,266,000
Held to maturity Fair Value | $ 525,830,000 | $ 592,763,000
Held to maturity - Weighted Average Yield | 2.09% | 2.15%
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 344,581,000 | $ 422,168,000
Available-for-sale Securities, Gross Unrealized Gains | 2,464,000 | 6,354,000
Available-for-sale Securities, Gross Unrealized Losses | 1,462,000 | 3,036,000
Available-for-sale Securities | $ 345,583,000 | $ 425,486,000
Available for sale - Weighted Average Yield | 2.36% | 2.59%
Held-to-maturity, Amortized cost | $ 530,178,000 | $ 599,884,000
Held to maturity Securities Unrecognized Gains | 367,000 | 145,000
Held-to-maturity Securities, Unrecognized Loss | 4,715,000 | 7,266,000
Held to maturity Fair Value | $ 525,830,000 | $ 592,763,000
Held to maturity - Weighted Average Yield | 2.09% | 2.15%
Collateralized Mortgage Backed Securities [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 162,993,000 | $ 163,614,000
Available-for-sale Securities, Gross Unrealized Gains | 2,197,000 | 2,241,000
Available-for-sale Securities, Gross Unrealized Losses | 423,000 | 620,000
Available-for-sale Securities | $ 164,767,000 | $ 165,235,000
Available for sale - Weighted Average Yield | 2.94% | 2.95%
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 | 86,905,000 | $ 103,990,000
Available-for-sale Securities, Gross Unrealized Gains | 6,000 | 64,000
Available-for-sale Securities, Gross Unrealized Losses | 1,038,000 | 2,223,000
Available-for-sale Securities | $ 85,873,000 | $ 101,831,000
Available for sale - Weighted Average Yield | 1.90% | 1.88%
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 | 17,457,000 | $ 60,095,000
Available-for-sale Securities, Gross Unrealized Gains | 72,000 | 81,000
Available-for-sale Securities, Gross Unrealized Losses | 329,000 | 1,244,000
Available-for-sale Securities | $ 17,200,000 | $ 58,932,000
Available for sale - Weighted Average Yield | 2.42% | 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 | 10,269,000 | $ 49,672,000
Available-for-sale Securities, Gross Unrealized Gains | 0 | 0
Available-for-sale Securities, Gross Unrealized Losses | 51,000 | 618,000
Available-for-sale Securities | $ 10,218,000 | $ 49,054,000
Available for sale - Weighted Average Yield | 1.26% | 1.73%
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 | 3,121,000 | $ 3,903,000
Available-for-sale Securities, Gross Unrealized Gains | 0 | 0
Available-for-sale Securities, Gross Unrealized Losses | 29,000 | 19,000
Available-for-sale Securities | $ 3,092,000 | $ 3,884,000
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 | $ 4,680,000
Available-for-sale Securities, Gross Unrealized Gains | 0 | 0
Available-for-sale Securities, Gross Unrealized Losses | 249,000 | 607,000
Available-for-sale Securities | $ 2,206,000 | $ 4,073,000
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 | $ 1,612,000 | $ 1,840,000
Available-for-sale Securities, Gross Unrealized Gains | 72,000 | 81,000
Available-for-sale Securities, Gross Unrealized Losses | 0 | 0
Available-for-sale Securities | $ 1,684,000 | $ 1,921,000
Available for sale - Weighted Average Yield | 3.00% | 3.00%
Held-to-maturity, Amortized cost | $ 0 |
Held to maturity Fair Value | $ 0 |

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