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Investment Securities Held to Maturity (Details) $ in Thousands | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($)
--- | --- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Equity Securities | $ 1,916 | $ 0 | $ 0
Held-To-Maturity Securities, at Amortized Cost | 289,952 | 335,907 | 341,526
Held-To-Maturity Securities, at Fair Value | 282,719 | 335,901 | 343,899
Gross Unrealized Gains | 261 | 1,960 | 3,715
Gross Unrealized Losses | 7,494 | 1,966 | 1,342
Maturities of Debt Securities, at Amortized Cost: |  |  |
Within One Year | 19,381 |  |
From 1 - 5 Years | 141,123 |  |
From 5 - 10 Years | 126,823 |  |
Over 10 Years | 2,625 |  |
Maturities of Debt Securities, at Fair Value: |  |  |
Within One Year | 19,396 |  |
From 1 - 5 Years | 138,887 |  |
From 5 - 10 Years | 121,830 |  |
Over 10 Years | 2,606 |  |
Securities in a Continuous Loss Position, at Fair Value: |  |  |
Less than 12 Months | 142,319 | 69,412 | 81,782
12 Months or Longer | 89,165 | 68,409 | 13,331
Total | $ 231,484 | $ 137,821 | $ 95,113
Number of Securities in a Continuous Loss Position | 582 | 366 | 259
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |
Less than 12 Months | $ 2,746 | $ 498 | $ 1,045
12 Months or Longer | 4,748 | 1,468 | 297
Total | 7,494 | 1,966 | 1,342
State and Municipal Obligations |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-To-Maturity Securities, at Amortized Cost | 239,367 | 275,530 | 277,738
Held-To-Maturity Securities, at Fair Value | 233,557 | 275,353 | 279,384
Gross Unrealized Gains | 261 | 1,691 | 2,977
Gross Unrealized Losses | 6,071 | 1,868 | 1,331
Maturities of Debt Securities, at Amortized Cost: |  |  |
Within One Year | 19,381 |  |
From 1 - 5 Years | 93,084 |  |
From 5 - 10 Years | 124,277 |  |
Over 10 Years | 2,625 |  |
Maturities of Debt Securities, at Fair Value: |  |  |
Within One Year | 19,396 |  |
From 1 - 5 Years | 92,199 |  |
From 5 - 10 Years | 119,356 |  |
Over 10 Years | 2,606 |  |
Securities in a Continuous Loss Position, at Fair Value: |  |  |
Less than 12 Months | 95,944 | 55,648 | 78,238
12 Months or Longer | 86,378 | 65,152 | 13,331
Total | $ 182,322 | $ 120,800 | $ 91,569
Number of Securities in a Continuous Loss Position | 535 | 352 | 252
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |
Less than 12 Months | $ 1,443 | $ 442 | $ 1,034
12 Months or Longer | 4,628 | 1,425 | 297
Total | 6,071 | 1,867 | 1,331
Mortgage-Backed Securities - Residential |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-To-Maturity Securities, at Amortized Cost | 50,585 | 60,377 | 63,788
Held-To-Maturity Securities, at Fair Value | 49,162 | 60,548 | 64,515
Gross Unrealized Gains | 0 | 269 | 738
Gross Unrealized Losses | 1,423 | 98 | 11
Maturities of Debt Securities, at Amortized Cost: |  |  |
Within One Year | 0 |  |
From 1 - 5 Years | 48,039 |  |
From 5 - 10 Years | 2,546 |  |
Over 10 Years | 0 |  |
Maturities of Debt Securities, at Fair Value: |  |  |
Within One Year | 0 |  |
From 1 - 5 Years | 46,688 |  |
From 5 - 10 Years | 2,474 |  |
Over 10 Years | 0 |  |
Securities in a Continuous Loss Position, at Fair Value: |  |  |
Less than 12 Months | 46,375 | 13,764 | 3,544
12 Months or Longer | 2,787 | 3,257 | 0
Total | $ 49,162 | $ 17,021 | $ 3,544
Number of Securities in a Continuous Loss Position | 47 | 14 | 7
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |
Less than 12 Months | $ 1,303 | $ 56 | $ 11
12 Months or Longer | 120 | 43 | 0
Total | 1,423 | 99 | 11
Corporate and Other Debt Securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-To-Maturity Securities, at Amortized Cost | 0 | 0 | 0
Held-To-Maturity Securities, at Fair Value | 0 | 0 | 0
Gross Unrealized Gains | 0 | 0 | 0
Gross Unrealized Losses | 0 | 0 | 0
Maturities of Debt Securities, at Amortized Cost: |  |  |
Within One Year | 0 |  |
From 1 - 5 Years | 0 |  |
From 5 - 10 Years | 0 |  |
Over 10 Years | 0 |  |
Maturities of Debt Securities, at Fair Value: |  |  |
Within One Year | 0 |  |
From 1 - 5 Years | 0 |  |
From 5 - 10 Years | 0 |  |
Over 10 Years | 0 |  |
Securities in a Continuous Loss Position, at Fair Value: |  |  |
Less than 12 Months | 0 | 0 | 0
12 Months or Longer | 0 | 0 | 0
Total | $ 0 | $ 0 | $ 0
Number of Securities in a Continuous Loss Position | 0 | 0 | 0
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |
Less than 12 Months | $ 0 | $ 0 | $ 0
12 Months or Longer | 0 | 0 | 0
Total | 0 | 0 | 0
US Government Agencies Debt Securities | Mortgage-Backed Securities - Residential |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-To-Maturity Securities, at Amortized Cost | 3,147 | 2,680 | 2,792
US Government-sponsored Enterprises Debt Securities | Mortgage-Backed Securities - Residential |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-To-Maturity Securities, at Amortized Cost | 47,438 | 57,697 | 60,996
Collateral Pledged |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-To-Maturity Securities, Pledged as Collateral | 268,229 | 318,622 | 325,096
Fair Value, Measurements, Recurring |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Equity Securities | 1,916 |  |
Fair Value, Measurements, Recurring | US Government Agencies Debt Securities | Mortgage-Backed Securities - Residential |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-To-Maturity Securities, at Fair Value | 2,222 | 2,661 | 2,799
Fair Value, Measurements, Recurring | US Government-sponsored Enterprises Debt Securities | Mortgage-Backed Securities - Residential |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-To-Maturity Securities, at Fair Value | $ 46,940 | $ 57,887 | $ 61,716

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