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Investment Securities (Investment Securities by Contractual Maturity) (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 | 423,815 | 1,074,169
Collateralized Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 319,295 | 674,217
Available-for-sale Securities | 329,720 | 673,886
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 | 139,964 | 402,656
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 | 145,892 | 216,469
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 | 43,864 | 54,761
Collateralized Mortgage Backed Securities [Member] | Maturities Due In Less Than One Year [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 597 |
Available-for-sale Securities | 624 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due In Less Than One Year [Member] | FNMA and FHLMC [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 597 |
Available-for-sale Securities | 624 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due From One To Five Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 546 |
Available-for-sale Securities | 550 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due From One To Five Years [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 546 |
Available-for-sale Securities | 550 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 204,507 |
Available-for-sale Securities | 210,763 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member] | FNMA and FHLMC [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 103,975 |
Available-for-sale Securities | 107,933 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 64,979 |
Available-for-sale Securities | 66,388 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member] | CMO's [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 35,553 |
Available-for-sale Securities | 36,442 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 113,645 |
Available-for-sale Securities | 117,783 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | FNMA and FHLMC [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 30,495 |
Available-for-sale Securities | 31,407 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 75,888 |
Available-for-sale Securities | 78,954 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | CMO's [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 7,262 |
Available-for-sale Securities | 7,422 |
Investment Securities |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 93,605 | 400,258
Available-for-sale Securities | 94,095 | 400,283
Investment Securities | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 91,109 | 397,183
Available-for-sale Securities | 91,531 | 397,183
Investment Securities | 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 | 1,714 | 1,961
Investment Securities | Other Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 808 | 1,108
Available-for-sale Securities | 850 | $ 1,139
Investment Securities | Maturities Due In Less Than One Year [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 81,203 |
Available-for-sale Securities | 81,345 |
Investment Securities | Maturities Due In Less Than One Year [Member] | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 81,103 |
Available-for-sale Securities | 81,245 |
Investment Securities | Maturities Due In Less Than One Year [Member] | Other Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 100 |
Available-for-sale Securities | 100 |
Investment Securities | Maturities Due From One To Five Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 11,694 |
Available-for-sale Securities | 12,000 |
Investment Securities | Maturities Due From One To Five Years [Member] | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 10,006 |
Available-for-sale Securities | 10,286 |
Investment Securities | Maturities Due From One To Five Years [Member] | Obligation of US Government Sponsored Agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 1,688 |
Available-for-sale Securities | 1,714 |
Investment Securities | Maturities Due From Five To Ten Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 708 |
Available-for-sale Securities | 750 |
Investment Securities | Maturities Due From Five To Ten Years [Member] | Other Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 708 |
Available-for-sale Securities | $ 750 |

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