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Investment Securities Schedule of Held to Maturity Securities (Details) $ in Thousands | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
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Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-Maturity (Approximate Fair Value of $335,901 at December 31, 2017, and $343,751 at December 31, 2016) | $ 335,907 | $ 345,427
Held-To-Maturity Securities, at Fair Value | 335,901 | 343,751
Gross Unrealized Gains | 1,960 | 2,316
Gross Unrealized Losses | 1,966 | 3,992
Held-To-Maturity Securities, Pledged as Collateral, at Fair Value | 318,622 | 321,202
Maturities of Debt Securities, at Amortized Cost: |  |
Within One Year | 38,422 |
From 1 - 5 Years | 135,001 |
From 5 - 10 Years | 159,083 |
Over 10 Years | 3,401 |
Maturities of Debt Securities, at Fair Value: |  |
Within One Year | 38,506 |
From 1 - 5 Years | 135,869 |
From 5 - 10 Years | 158,082 |
Over 10 Years | 3,444 |
Securities in a Continuous Loss Position, at Fair Value: |  |
Less than 12 Months | 69,412 | 120,561
12 Months or Longer | 68,409 | 12,363
Total | $ 137,821 | $ 132,924
Number of Securities in a Continuous Loss Position | 366 | 360
Unrealized Losses on Securities in a Continuous Loss Position: |  |
Less than 12 Months | $ 498 | $ 3,298
12 Months or Longer | 1,468 | 694
Total | 1,966 | 3,992
State and Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-Maturity (Approximate Fair Value of $335,901 at December 31, 2017, and $343,751 at December 31, 2016) | 275,530 | 268,892
Held-To-Maturity Securities, at Fair Value | 275,353 | 267,127
Gross Unrealized Gains | 1,691 | 2,058
Gross Unrealized Losses | 1,868 | 3,823
Maturities of Debt Securities, at Amortized Cost: |  |
Within One Year | 38,422 |
From 1 - 5 Years | 80,789 |
From 5 - 10 Years | 152,918 |
Over 10 Years | 3,401 |
Maturities of Debt Securities, at Fair Value: |  |
Within One Year | 38,506 |
From 1 - 5 Years | 81,499 |
From 5 - 10 Years | 151,904 |
Over 10 Years | 3,444 |
Securities in a Continuous Loss Position, at Fair Value: |  |
Less than 12 Months | 55,648 | 107,255
12 Months or Longer | 65,152 | 12,363
Total | $ 120,800 | $ 119,618
Number of Securities in a Continuous Loss Position | 352 | 347
Unrealized Losses on Securities in a Continuous Loss Position: |  |
Less than 12 Months | $ 442 | $ 3,129
12 Months or Longer | 1,425 | 694
Total | 1,867 | 3,823
Collateralized Mortgage Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-Maturity (Approximate Fair Value of $335,901 at December 31, 2017, and $343,751 at December 31, 2016) | 60,377 | 75,535
Held-To-Maturity Securities, at Fair Value | 60,548 | 75,624
Gross Unrealized Gains | 269 | 258
Gross Unrealized Losses | 98 | 169
Maturities of Debt Securities, at Amortized Cost: |  |
Within One Year | 0 |
From 1 - 5 Years | 54,212 |
From 5 - 10 Years | 6,165 |
Over 10 Years | 0 |
Maturities of Debt Securities, at Fair Value: |  |
Within One Year | 0 |
From 1 - 5 Years | 54,370 |
From 5 - 10 Years | 6,178 |
Over 10 Years | 0 |
Securities in a Continuous Loss Position, at Fair Value: |  |
Less than 12 Months | 13,764 | 13,306
12 Months or Longer | 3,257 | 0
Total | $ 17,021 | $ 13,306
Number of Securities in a Continuous Loss Position | 14 | 13
Unrealized Losses on Securities in a Continuous Loss Position: |  |
Less than 12 Months | $ 56 | $ 169
12 Months or Longer | 43 | 0
Total | 99 | 169
Corporate and Other Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-Maturity (Approximate Fair Value of $335,901 at December 31, 2017, and $343,751 at December 31, 2016) | 0 | 1,000
Held-To-Maturity Securities, at Fair Value | 0 | 1,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 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
12 Months or Longer | 0 | 0
Total | $ 0 | $ 0
Number of Securities in a Continuous Loss Position | 0 | 0
Unrealized Losses on Securities in a Continuous Loss Position: |  |
Less than 12 Months | $ 0 | $ 0
12 Months or Longer | 0 | 0
Total | 0 | 0
Collateralized Mortgage Backed Securities [Member] | Agency Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-Maturity (Approximate Fair Value of $335,901 at December 31, 2017, and $343,751 at December 31, 2016) | 2,680 | 3,206
Collateralized Mortgage Backed Securities [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-Maturity (Approximate Fair Value of $335,901 at December 31, 2017, and $343,751 at December 31, 2016) | 57,697 | 72,329
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-To-Maturity Securities, at Fair Value | 57,887 | 72,402
Fair Value, Measurements, Recurring [Member] | Agency Securities [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-To-Maturity Securities, at Fair Value | $ 2,661 | $ 3,222

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