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Investment Securities (Investment securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 648,565 | $ 1,074,475
Available-for-sale Securities, Gross Unrealized Gains | 8,895 | 1,611
Available-for-sale Securities, Gross Unrealized Losses | 0 | 1,917
Available-for-sale Securities | $ 657,460 | $ 1,074,169
Available for sale - Weighted Average Yield | 1.89% | 1.92%
Collateralized Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 348,811 | $ 674,217
Available-for-sale Securities, Gross Unrealized Gains | 6,827 | 1,580
Available-for-sale Securities, Gross Unrealized Losses | 0 | 1,911
Available-for-sale Securities | $ 355,638 | $ 673,886
Available for sale - Weighted Average Yield | 2.10% | 2.11%
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 155,303 | $ 403,227
Available-for-sale Securities, Gross Unrealized Gains | 2,916 | 846
Available-for-sale Securities, Gross Unrealized Losses | 0 | 1,417
Available-for-sale Securities | $ 158,219 | $ 402,656
Available for sale - Weighted Average Yield | 1.98% | 2.00%
Collateralized Mortgage Backed Securities [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 142,294 | $ 215,755
Available-for-sale Securities, Gross Unrealized Gains | 2,994 | 718
Available-for-sale Securities, Gross Unrealized Losses | 0 | 4
Available-for-sale Securities | $ 145,288 | $ 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 | $ 51,214 | $ 55,235
Available-for-sale Securities, Gross Unrealized Gains | 917 | 16
Available-for-sale Securities, Gross Unrealized Losses | 0 | 490
Available-for-sale Securities | $ 52,131 | $ 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 | $ 299,754 | $ 400,258
Available-for-sale Securities, Gross Unrealized Gains | 2,068 | 31
Available-for-sale Securities, Gross Unrealized Losses | 0 | 6
Available-for-sale Securities | $ 301,822 | $ 400,283
Available for sale - Weighted Average Yield | 1.64% | 1.60%
Securities Investment [Member] | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 296,992 | $ 397,183
Available-for-sale Securities, Gross Unrealized Gains | 1,995 | 0
Available-for-sale Securities, Gross Unrealized Losses | 0 | 0
Available-for-sale Securities | $ 298,987 | $ 397,183
Available for sale - Weighted Average Yield | 1.63% | 1.60%
Securities Investment [Member] | Obligation of US Government sponsored agencies at loss [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 1,884 | $ 1,967
Available-for-sale Securities, Gross Unrealized Gains | 33 | 0
Available-for-sale Securities, Gross Unrealized Losses | 0 | 6
Available-for-sale Securities | $ 1,917 | $ 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 | $ 878 | $ 1,108
Available-for-sale Securities, Gross Unrealized Gains | 40 | 31
Available-for-sale Securities, Gross Unrealized Losses | 0 | 0
Available-for-sale Securities | $ 918 | $ 1,139
Available for sale - Weighted Average Yield | 2.98% | 3.00%

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