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Investment Securities (Investment securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 1,074,475 | $ 854,511
Available-for-sale Securities, Gross Unrealized Gains | 1,611 | 1,469
Available-for-sale Securities, Gross Unrealized Losses | 1,917 | 14,123
Available-for-sale Securities | $ 1,074,169 | $ 841,857
Available for sale - Weighted Average Yield | 1.92% | 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 | 674,217 | $ 840,055
Available-for-sale Securities, Gross Unrealized Gains | 1,580 | 1,454
Available-for-sale Securities, Gross Unrealized Losses | 1,911 | 13,944
Available-for-sale Securities | $ 673,886 | $ 827,565
Available for sale - Weighted Average Yield | 2.11% | 2.66%
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 403,227 | $ 561,878
Available-for-sale Securities, Gross Unrealized Gains | 846 | 404
Available-for-sale Securities, Gross Unrealized Losses | 1,417 | 8,951
Available-for-sale Securities | $ 402,656 | $ 553,331
Available for sale - Weighted Average Yield | 2.00% | 2.59%
Collateralized Mortgage Backed Securities [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 215,755 | $ 211,947
Available-for-sale Securities, Gross Unrealized Gains | 718 | 1,050
Available-for-sale Securities, Gross Unrealized Losses | 4 | 2,827
Available-for-sale Securities | $ 216,469 | $ 210,170
Available for sale - Weighted Average Yield | 2.33% | 3.10%
Collateralized Mortgage Backed Securities [Member] | CMO's [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 55,235 | $ 66,230
Available-for-sale Securities, Gross Unrealized Gains | 16 | 0
Available-for-sale Securities, Gross Unrealized Losses | 490 | 2,166
Available-for-sale Securities | $ 54,761 | $ 64,064
Available for sale - Weighted Average Yield | 1.97% | 1.90%
Securities Investment [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 400,258 | $ 14,456
Available-for-sale Securities, Gross Unrealized Gains | 31 | 15
Available-for-sale Securities, Gross Unrealized Losses | 6 | 179
Available-for-sale Securities | $ 400,283 | $ 14,292
Available for sale - Weighted Average Yield | 1.60% | 1.50%
Securities Investment [Member] | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 397,183 | $ 10,924
Available-for-sale Securities, Gross Unrealized Gains | 0 | 0
Available-for-sale Securities, Gross Unrealized Losses | 0 | 119
Available-for-sale Securities | $ 397,183 | $ 10,805
Available for sale - Weighted Average Yield | 1.60% | 1.36%
Securities Investment [Member] | Obligation of US Government sponsored agencies at loss [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 1,967 | $ 2,325
Available-for-sale Securities, Gross Unrealized Gains | 0 | 0
Available-for-sale Securities, Gross Unrealized Losses | 6 | 60
Available-for-sale Securities | $ 1,961 | $ 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 | $ 1,108 | $ 1,207
Available-for-sale Securities, Gross Unrealized Gains | 31 | 15
Available-for-sale Securities, Gross Unrealized Losses | 0 | 0
Available-for-sale Securities | $ 1,139 | $ 1,222
Available for sale - Weighted Average Yield | 3.00% | 2.99%

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