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Investment Securities (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Schedule of Investments [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 21.00% |  |
Investment Securities average remaining life |  | 4 years 9 months 26 days |  |
Available-for-sale Securities, Gross Realized Losses |  | $ 2,600,000 |  |
Debt securities held-to-maturity, at amortized cost (fair value of $344,341 and $363,779 at September 30, 2018 and December 31, 2017, respectively) | $ 350,642,000 | 350,642,000 |  | $ 357,197,000
Debt Securities, Held-to-maturity, Sold, Realized Gain (Loss) |  | $ 291,000 |  |
percent of held to securities sold paid down | 96.30% | 96.30% |  |
Other than Temporary Impairment Losses, Investments | $ 0 | $ 0 | $ 0 |
Available-for-sale Securities, Gross Realized Gains |  |  | $ 0.000 |
Asset backed securities mortgage portfolio, term |  | 15 years |  |
Available-for-sale securities | 1,074,605,000 | $ 1,074,605,000 |  | 1,097,645,000
Securities sold at a gain [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Available-for-sale securities | 246,961,000 | 246,961,000 |  |
Securities sold at a gain [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Debt securities held-to-maturity, at amortized cost (fair value of $344,341 and $363,779 at September 30, 2018 and December 31, 2017, respectively) | 7,400,000 | 7,400,000 |  |
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Debt securities held-to-maturity, at amortized cost (fair value of $344,341 and $363,779 at September 30, 2018 and December 31, 2017, respectively) | 46,974,000 | 46,974,000 |  | 56,785,000
Collateral Pledged [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Restricted | $ 564,000,000 | $ 564,000,000 |  | $ 557,000,000

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