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Investment Securities Schedule of Held to Maturity Securities (Details) $ in Thousands | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
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Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-Maturity (Approximate Fair Value of $343,751 at December 31, 2016, and $325,930 at December 31, 2015) | $ 345,427 | $ 320,611
Held-To-Maturity Securities, at Fair Value | 343,751 | 325,930
Gross Unrealized Gains | 2,316 | 5,487
Gross Unrealized Losses | 3,992 | 168
Held-To-Maturity Securities, Pledged as Collateral, at Fair Value | 321,202 | 299,767
Maturities of Debt Securities, at Amortized Cost: |  |
Within One Year | 33,456 |
From 1 - 5 Years | 147,782 |
From 5 - 10 Years | 160,426 |
Over 10 Years | 3,763 |
Maturities of Debt Securities, at Fair Value: |  |
Within One Year | 32,505 |
From 1 - 5 Years | 149,250 |
From 5 - 10 Years | 157,235 |
Over 10 Years | 4,761 |
Securities in a Continuous Loss Position, at Fair Value: |  |
Less than 12 Months | 120,561 | 8,302
12 Months or Longer | 12,363 | 15,918
Total | $ 132,924 | $ 24,220
Number of Securities in a Continuous Loss Position | 360 | 62
Unrealized Losses on Securities in a Continuous Loss Position: |  |
Less than 12 Months | $ 3,298 | $ 104
12 Months or Longer | 694 | 64
Total | 3,992 | 168
State and Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-Maturity (Approximate Fair Value of $343,751 at December 31, 2016, and $325,930 at December 31, 2015) | 268,892 | 226,053
Held-To-Maturity Securities, at Fair Value | 267,127 | 230,621
Gross Unrealized Gains | 2,058 | 4,619
Gross Unrealized Losses | 3,823 | 51
Maturities of Debt Securities, at Amortized Cost: |  |
Within One Year | 32,456 |
From 1 - 5 Years | 86,070 |
From 5 - 10 Years | 146,603 |
Over 10 Years | 3,763 |
Maturities of Debt Securities, at Fair Value: |  |
Within One Year | 32,505 |
From 1 - 5 Years | 87,486 |
From 5 - 10 Years | 143,375 |
Over 10 Years | 3,761 |
Securities in a Continuous Loss Position, at Fair Value: |  |
Less than 12 Months | 107,255 | 2,302
12 Months or Longer | 12,363 | 11,764
Total | $ 119,618 | $ 14,066
Number of Securities in a Continuous Loss Position | 347 | 54
Unrealized Losses on Securities in a Continuous Loss Position: |  |
Less than 12 Months | $ 3,129 | $ 11
12 Months or Longer | 694 | 40
Total | 3,823 | 51
Collateralized Mortgage Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-Maturity (Approximate Fair Value of $343,751 at December 31, 2016, and $325,930 at December 31, 2015) | 75,535 | 93,558
Held-To-Maturity Securities, at Fair Value | 75,624 | 94,309
Gross Unrealized Gains | 258 | 868
Gross Unrealized Losses | 169 | 117
Maturities of Debt Securities, at Amortized Cost: |  |
Within One Year | 0 |
From 1 - 5 Years | 61,712 |
From 5 - 10 Years | 13,823 |
Over 10 Years | 0 |
Maturities of Debt Securities, at Fair Value: |  |
Within One Year | 0 |
From 1 - 5 Years | 61,764 |
From 5 - 10 Years | 13,860 |
Over 10 Years | 0 |
Securities in a Continuous Loss Position, at Fair Value: |  |
Less than 12 Months | 13,306 | 6,000
12 Months or Longer | 0 | 4,154
Total | $ 13,306 | $ 10,154
Number of Securities in a Continuous Loss Position | 13 | 8
Unrealized Losses on Securities in a Continuous Loss Position: |  |
Less than 12 Months | $ 169 | $ 93
12 Months or Longer | 0 | 24
Total | 169 | 117
Corporate and Other Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-Maturity (Approximate Fair Value of $343,751 at December 31, 2016, and $325,930 at December 31, 2015) | 1,000 | 1,000
Held-To-Maturity Securities, at Fair Value | 1,000 | 1,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Maturities of Debt Securities, at Amortized Cost: |  |
Within One Year | 1,000 |
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 | 1,000 |
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 $343,751 at December 31, 2016, and $325,930 at December 31, 2015) | 3,206 | 3,802
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 $343,751 at December 31, 2016, and $325,930 at December 31, 2015) | 72,329 | 89,756
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 | 72,402 | 90,457
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 | $ 3,222 | $ 3,852

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