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Investment Securities (Investment Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 432,176 | $ 1,074,475
Available-for-sale Securities | 446,438 | 1,074,169
Collateralized Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 418,976 | 674,217
Available-for-sale Securities | 432,935 | 673,886
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 206,195 | 403,227
Available-for-sale Securities | 210,949 | 402,656
Collateralized Mortgage Backed Securities [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 174,472 | 215,755
Available-for-sale Securities | 182,772 | 216,469
Collateralized Mortgage Backed Securities [Member] | CMO's [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 38,309 | 55,235
Available-for-sale Securities | 39,214 | 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 | 348 |
Available-for-sale Securities | 364 |
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 | 348 |
Available-for-sale Securities | 364 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due From One To Five Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 469 |
Available-for-sale Securities | 472 |
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 | 469 |
Available-for-sale Securities | 472 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 187,737 |
Available-for-sale Securities | 193,737 |
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 | 96,902 |
Available-for-sale Securities | 100,643 |
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 | 58,615 |
Available-for-sale Securities | 60,081 |
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 | 32,220 |
Available-for-sale Securities | 33,013 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 230,422 |
Available-for-sale Securities | 238,362 |
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 | 108,945 |
Available-for-sale Securities | 109,942 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 115,388 |
Available-for-sale Securities | 122,219 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | CMO's [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 6,089 |
Available-for-sale Securities | 6,201 |
Investment Securities |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 13,200 | 400,258
Available-for-sale Securities | 13,503 | 400,283
Investment Securities | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 10,740 | 397,183
Available-for-sale Securities | 10,983 | 397,183
Investment Securities | Obligation of US Government Sponsored Agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 1,585 | 1,967
Available-for-sale Securities | 1,606 | 1,961
Investment Securities | Other Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 875 | 1,108
Available-for-sale Securities | 914 | $ 1,139
Investment Securities | Maturities Due In Less Than One Year [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 986 |
Available-for-sale Securities | 986 |
Investment Securities | Maturities Due In Less Than One Year [Member] | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 735 |
Available-for-sale Securities | 735 |
Investment Securities | Maturities Due In Less Than One Year [Member] | Other Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 251 |
Available-for-sale Securities | 251 |
Investment Securities | Maturities Due From One To Five Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 11,590 |
Available-for-sale Securities | 11,854 |
Investment Securities | Maturities Due From One To Five Years [Member] | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 10,005 |
Available-for-sale Securities | 10,248 |
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 | 1,585 |
Available-for-sale Securities | 1,606 |
Investment Securities | Maturities Due From Five To Ten Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 624 |
Available-for-sale Securities | 663 |
Investment Securities | Maturities Due From Five To Ten Years [Member] | Other Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 624 |
Available-for-sale Securities | $ 663 |

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