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Investment Securities (Investment securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 860,911 | $ 854,511
Available-for-sale Securities, Gross Unrealized Gains | 2,537 | 1,469
Available-for-sale Securities, Gross Unrealized Losses | 6,015 | 14,123
Available-for-sale Securities | $ 857,433 | $ 841,857
Available for sale - Weighted Average Yield | 2.23% | 2.64%
Held-to-maturity, Amortized cost |  | $ 424,740
Held to maturity Securities Unrecognized Gains |  | 0
Held-to-maturity Securities, Unrecognized Loss |  | 14,387
Held to maturity Fair Value | $ 0 | $ 410,353
Held to maturity - Weighted Average Yield |  | 2.07%
Collateralized Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 846,795 | $ 840,055
Available-for-sale Securities, Gross Unrealized Gains | 2,505 | 1,454
Available-for-sale Securities, Gross Unrealized Losses | 5,967 | 13,944
Available-for-sale Securities | $ 843,333 | $ 827,565
Available for sale - Weighted Average Yield | 2.24% | 2.66%
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 694,431 | $ 561,878
Available-for-sale Securities, Gross Unrealized Gains | 1,277 | 404
Available-for-sale Securities, Gross Unrealized Losses | 5,352 | 8,951
Available-for-sale Securities | $ 690,356 | $ 553,331
Available for sale - Weighted Average Yield | 2.19% | 2.59%
Collateralized Mortgage Backed Securities [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 93,126 | $ 211,947
Available-for-sale Securities, Gross Unrealized Gains | 1,228 | 1,050
Available-for-sale Securities, Gross Unrealized Losses | 7 | 2,827
Available-for-sale Securities | $ 94,347 | $ 210,170
Available for sale - Weighted Average Yield | 2.84% | 3.10%
Collateralized Mortgage Backed Securities [Member] | CMO's [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 59,238 | $ 66,230
Available-for-sale Securities, Gross Unrealized Gains | 0 | 0
Available-for-sale Securities, Gross Unrealized Losses | 608 | 2,166
Available-for-sale Securities | $ 58,630 | $ 64,064
Available for sale - Weighted Average Yield | 1.90% | 1.90%
Securities Investment [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 14,116 | $ 14,456
Available-for-sale Securities, Gross Unrealized Gains | 32 | 15
Available-for-sale Securities, Gross Unrealized Losses | 48 | 179
Available-for-sale Securities | $ 14,100 | $ 14,292
Available for sale - Weighted Average Yield | 1.48% | 1.50%
Securities Investment [Member] | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 10,938 | $ 10,924
Available-for-sale Securities, Gross Unrealized Gains | 1 | 0
Available-for-sale Securities, Gross Unrealized Losses | 32 | 119
Available-for-sale Securities | $ 10,907 | $ 10,805
Available for sale - Weighted Average Yield | 1.36% | 1.36%
Securities Investment [Member] | Obligation of US Government sponsored agencies at loss [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 2,147 | $ 2,325
Available-for-sale Securities, Gross Unrealized Gains | 0 | 0
Available-for-sale Securities, Gross Unrealized Losses | 16 | 60
Available-for-sale Securities | $ 2,131 | $ 2,265
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 | $ 1,031 | $ 1,207
Available-for-sale Securities, Gross Unrealized Gains | 31 | 15
Available-for-sale Securities, Gross Unrealized Losses | 0 | 0
Available-for-sale Securities | $ 1,062 | $ 1,222
Available for sale - Weighted Average Yield | 2.97% | 2.99%

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