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Investment Securities (Investment Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 412,900 | $ 1,074,475
Available-for-sale Securities, Gross Unrealized Gains | 10,915 | 1,611
Available-for-sale Securities, Gross Unrealized Losses | 0 | 1,917
Available-for-sale Securities | $ 423,815 | $ 1,074,169
Available for sale - Weighted Average Yield | 2.00% | 1.92%
Collateralized Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 319,295 | $ 674,217
Available-for-sale Securities, Gross Unrealized Gains | 10,425 | 1,580
Available-for-sale Securities, Gross Unrealized Losses | 0 | 1,911
Available-for-sale Securities | $ 329,720 | $ 673,886
Available for sale - Weighted Average Yield | 2.11% | 2.11%
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 135,067 | $ 403,227
Available-for-sale Securities, Gross Unrealized Gains | 4,897 | 846
Available-for-sale Securities, Gross Unrealized Losses | 0 | 1,417
Available-for-sale Securities | $ 139,964 | $ 402,656
Available for sale - Weighted Average Yield | 1.96% | 2.00%
Collateralized Mortgage Backed Securities [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 141,412 | $ 215,755
Available-for-sale Securities, Gross Unrealized Gains | 4,480 | 718
Available-for-sale Securities, Gross Unrealized Losses | 0 | 4
Available-for-sale Securities | $ 145,892 | $ 216,469
Available for sale - Weighted Average Yield | 2.29% | 2.33%
Collateralized Mortgage Backed Securities [Member] | CMO's [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 42,816 | $ 55,235
Available-for-sale Securities, Gross Unrealized Gains | 1,048 | 16
Available-for-sale Securities, Gross Unrealized Losses | 0 | 490
Available-for-sale Securities | $ 43,864 | $ 54,761
Available for sale - Weighted Average Yield | 1.97% | 1.97%
Securities Investment [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 93,605 | $ 400,258
Available-for-sale Securities, Gross Unrealized Gains | 490 | 31
Available-for-sale Securities, Gross Unrealized Losses | 0 | 6
Available-for-sale Securities | $ 94,095 | $ 400,283
Available for sale - Weighted Average Yield | 1.62% | 1.60%
Securities Investment [Member] | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 91,109 | $ 397,183
Available-for-sale Securities, Gross Unrealized Gains | 422 | 0
Available-for-sale Securities, Gross Unrealized Losses | 0 | 0
Available-for-sale Securities | $ 91,531 | $ 397,183
Available for sale - Weighted Average Yield | 1.61% | 1.60%
Securities Investment [Member] | Obligation of US Government Sponsored Agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 1,688 | $ 1,967
Available-for-sale Securities, Gross Unrealized Gains | 26 | 0
Available-for-sale Securities, Gross Unrealized Losses | 0 | 6
Available-for-sale Securities | $ 1,714 | $ 1,961
Available for sale - Weighted Average Yield | 1.39% | 1.38%
Securities Investment [Member] | Other Debt Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 808 | $ 1,108
Available-for-sale Securities, Gross Unrealized Gains | 42 | 31
Available-for-sale Securities, Gross Unrealized Losses | 0 | 0
Available-for-sale Securities | $ 850 | $ 1,139
Available for sale - Weighted Average Yield | 2.99% | 3.00%

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