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Investment Securities (Investment securities) (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 1,248,749,000 | $ 854,511,000
Available-for-sale Securities, Gross Unrealized Gains | 5,603,000 | 1,469,000
Available-for-sale Securities, Gross Unrealized Losses | 14,883,000 | 14,123,000
Available-for-sale Securities | $ 1,239,469,000 | $ 841,857,000
Available for sale - Weighted Average Yield | 2.47% | 2.64%
Held-to-maturity, Amortized cost |  | $ 424,740,000
Held to maturity Securities Unrecognized Gains |  | 0
Held-to-maturity Securities, Unrecognized Loss |  | 14,387,000
Held to maturity Fair Value | $ 0 | $ 410,353,000
Held to maturity - Weighted Average Yield |  | 2.07%
Collateralized Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 1,234,416,000 | $ 840,055,000
Available-for-sale Securities, Gross Unrealized Gains | 5,576,000 | 1,454,000
Available-for-sale Securities, Gross Unrealized Losses | 14,767,000 | 13,944,000
Available-for-sale Securities | $ 1,225,225,000 | $ 827,565,000
Available for sale - Weighted Average Yield | 2.49% | 2.66%
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 947,332,000 | $ 561,878,000
Available-for-sale Securities, Gross Unrealized Gains | 2,504,000 | 404,000
Available-for-sale Securities, Gross Unrealized Losses | 12,558,000 | 8,951,000
Available-for-sale Securities | $ 937,278,000 | $ 553,331,000
Available for sale - Weighted Average Yield | 2.37% | 2.59%
Held-to-maturity, Amortized cost | $ 0 |
Held to maturity Fair Value | 0 |
Collateralized Mortgage Backed Securities [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 224,157,000 | $ 211,947,000
Available-for-sale Securities, Gross Unrealized Gains | 3,072,000 | 1,050,000
Available-for-sale Securities, Gross Unrealized Losses | 671,000 | 2,827,000
Available-for-sale Securities | $ 226,558,000 | $ 210,170,000
Available for sale - Weighted Average Yield | 3.15% | 3.10%
Collateralized Mortgage Backed Securities [Member] | CMO's [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 62,927,000 | $ 66,230,000
Available-for-sale Securities, Gross Unrealized Gains | 0 | 0
Available-for-sale Securities, Gross Unrealized Losses | 1,538,000 | 2,166,000
Available-for-sale Securities | $ 61,389,000 | $ 64,064,000
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 | 14,333,000 | $ 14,456,000
Available-for-sale Securities, Gross Unrealized Gains | 27,000 | 15,000
Available-for-sale Securities, Gross Unrealized Losses | 116,000 | 179,000
Available-for-sale Securities | $ 14,244,000 | $ 14,292,000
Available for sale - Weighted Average Yield | 1.50% | 1.50%
Securities Investment [Member] | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 10,933,000 | $ 10,924,000
Available-for-sale Securities, Gross Unrealized Gains | 0 | 0
Available-for-sale Securities, Gross Unrealized Losses | 74,000 | 119,000
Available-for-sale Securities | $ 10,859,000 | $ 10,805,000
Available for sale - Weighted Average Yield | 1.37% | 1.36%
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 | 2,238,000 | $ 2,325,000
Available-for-sale Securities, Gross Unrealized Gains | 0 | 0
Available-for-sale Securities, Gross Unrealized Losses | 42,000 | 60,000
Available-for-sale Securities | $ 2,196,000 | $ 2,265,000
Available for sale - Weighted Average Yield | 1.38% | 1.38%
Securities Investment [Member] | Other Debt Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 1,162,000 | $ 1,207,000
Available-for-sale Securities, Gross Unrealized Gains | 27,000 | 15,000
Available-for-sale Securities, Gross Unrealized Losses | 0 | 0
Available-for-sale Securities | $ 1,189,000 | $ 1,222,000
Available for sale - Weighted Average Yield | 2.99% | 2.99%

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