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Investment Securities (Narrative) (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Schedule of Investments [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  |
Tax Equivalent Interest Adjustment | $ 578,000 |  |
Investment Securities average remaining life | 4 years 11 months 5 days |  |
Available-for-sale Securities, Gross Realized Losses | $ 2,600,000 |  |
Debt securities held-to-maturity, at amortized cost (fair value of $346,199 and $363,779 at March 31, 2018 and December 31, 2017, respectively) | 347,622,000 |  | $ 357,197,000
Held-to-maturity Securities, Sold Security, Realized Gain (Loss) | $ 291,000 |  |
percent of held to securities sold paid down | 96.30% |  |
Other than Temporary Impairment Losses, Investments | $ 0 | $ 0 |
Available-for-sale Securities, Gross Realized Gains | $ 0.000 |  |
Asset backed securities mortgage portfolio, term | 15 years |  |
Available-for-sale securities | $ 1,079,745,000 |  | 1,097,645,000
Available-for-sale Securities Pledged as Collateral | 563,000,000 |  | 557,000,000
Securities sold at a gain [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale securities | 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 $346,199 and $363,779 at March 31, 2018 and December 31, 2017, respectively) | 7,366,000 |  |
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 $346,199 and $363,779 at March 31, 2018 and December 31, 2017, respectively) | 47,767,000 |  | 56,785,000
Available-for-sale securities | $ 1,079,745,000 |  | $ 852,645,000

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