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Investment Securities (Investment securities by contractual maturity) (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 | 657,460 | 1,074,169
Collateralized Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 348,811 | 674,217
Available-for-sale Securities | 355,638 | 673,886
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 | 158,219 | 402,656
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 | 145,288 | 216,469
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 | 52,131 | 54,761
Collateralized Mortgage Backed Securities [Member] | Maturities Due From One To Five Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 1,936 |
Available-for-sale Securities | 1,996 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due From One To Five Years [Member] | FNMA and FHLMC [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 1,242 |
Available-for-sale Securities | 1,292 |
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 | 694 |
Available-for-sale Securities | 704 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 207,596 |
Available-for-sale Securities | 211,394 |
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 | 104,324 |
Available-for-sale Securities | 106,488 |
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 | 61,219 |
Available-for-sale Securities | 62,188 |
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 | 42,053 |
Available-for-sale Securities | 42,718 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 139,279 |
Available-for-sale Securities | 142,248 |
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 | 49,737 |
Available-for-sale Securities | 50,439 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 80,381 |
Available-for-sale Securities | 82,396 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | CMO's [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 9,161 |
Available-for-sale Securities | 9,413 |
Investment Securities |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 299,754 | 400,258
Available-for-sale Securities | 301,822 | 400,283
Investment Securities | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 296,992 | 397,183
Available-for-sale Securities | 298,987 | 397,183
Investment Securities | 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 | 1,917 | 1,961
Investment Securities | Other Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 878 | 1,108
Available-for-sale Securities | 918 | $ 1,139
Investment Securities | Maturities Due In Less Than One Year [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 287,085 |
Available-for-sale Securities | 288,758 |
Investment Securities | Maturities Due In Less Than One Year [Member] | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 286,985 |
Available-for-sale Securities | 288,658 |
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 | 11,891 |
Available-for-sale Securities | 12,246 |
Investment Securities | Maturities Due From One To Five Years [Member] | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 10,007 |
Available-for-sale Securities | 10,329 |
Investment Securities | Maturities Due From One To Five Years [Member] | Obligation of US Government sponsored agencies at loss [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 1,884 |
Available-for-sale Securities | 1,917 |
Investment Securities | Maturities Due From Five To Ten Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 778 |
Available-for-sale Securities | 818 |
Investment Securities | Maturities Due From Five To Ten Years [Member] | Other Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 778 |
Available-for-sale Securities | $ 818 |

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