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Investment Securities (Investment securities by contractual maturity) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 860,911 | $ 854,511
Available-for-sale Securities | 857,433 | 841,857
Held-to-maturity, Amortized cost |  | 424,740
Held to maturity Fair Value | 0 | 410,353
Maturities Due From One To Five Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 4,756 |
Available-for-sale Securities | 4,767 |
Maturities Due From Five To Ten Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 245,769 |
Available-for-sale Securities | 245,166 |
Maturities Due After Ten Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 599,448 |
Available-for-sale Securities | 596,593 |
Collateralized Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 846,795 | 840,055
Available-for-sale Securities | 843,333 | 827,565
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 694,431 | 561,878
Available-for-sale Securities | 690,356 | 553,331
Collateralized Mortgage Backed Securities [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 93,126 | 211,947
Available-for-sale Securities | 94,347 | 210,170
Collateralized Mortgage Backed Securities [Member] | CMO's [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 59,238 | 66,230
Available-for-sale Securities | 58,630 | 64,064
Collateralized Mortgage Backed Securities [Member] | Maturities Due From One To Five Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 2,509 |
Available-for-sale Securities | 2,536 |
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 | 2,509 |
Available-for-sale Securities | 2,536 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 244,838 |
Available-for-sale Securities | 244,204 |
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 | 192,744 |
Available-for-sale Securities | 192,666 |
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 | 0 |
Available-for-sale Securities | 0 |
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 | 52,094 |
Available-for-sale Securities | 51,538 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 599,448 |
Available-for-sale Securities | 596,593 |
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 | 499,178 |
Available-for-sale Securities | 495,154 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 93,126 |
Available-for-sale Securities | 94,347 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | CMO's [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 7,144 |
Available-for-sale Securities | 7,092 |
Investment Securities |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 14,116 | 14,456
Available-for-sale Securities | 14,100 | 14,292
Investment Securities | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 10,938 | 10,924
Available-for-sale Securities | 10,907 | 10,805
Investment Securities | Obligation of US Government sponsored agencies at loss [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 2,147 | 2,325
Available-for-sale Securities | 2,131 | 2,265
Investment Securities | Other Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 1,031 | 1,207
Available-for-sale Securities | 1,062 | $ 1,222
Investment Securities | Maturities Due In Less Than One Year [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 10,938 |
Available-for-sale Securities | 10,907 |
Investment Securities | Maturities Due In Less Than One Year [Member] | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 10,938 |
Available-for-sale Securities | 10,907 |
Investment Securities | Maturities Due From One To Five Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 2,247 |
Available-for-sale Securities | 2,231 |
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 | 2,147 |
Available-for-sale Securities | 2,131 |
Investment Securities | Maturities Due From One To Five Years [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 Five To Ten Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 931 |
Available-for-sale Securities | 962 |
Investment Securities | Maturities Due From Five To Ten Years [Member] | Other Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 931 |
Available-for-sale Securities | $ 962 |

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