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Investment Securities Schedule of Held to Maturity Securities (Details) $ in Thousands | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
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Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-Maturity (Approximate Fair Value of $280,338 at December 31, 2018, and $335,901 at December 31, 2017) | $ 283,476 | $ 335,907
Held-To-Maturity Securities, at Fair Value | 280,338 | 335,901
Gross Unrealized Gains | 486 | 1,960
Gross Unrealized Losses | 3,624 | 1,966
Held-To-Maturity Securities, Pledged as Collateral, at Fair Value | 266,341 | 318,622
Maturities of Debt Securities, at Amortized Cost: |  |
Within One Year | 27,426 |
From 1 - 5 Years | 141,189 |
From 5 - 10 Years | 112,499 |
Over 10 Years | 2,362 |
Maturities of Debt Securities, at Fair Value: |  |
Within One Year | 27,464 |
From 1 - 5 Years | 140,109 |
From 5 - 10 Years | 110,396 |
Over 10 Years | 2,369 |
Securities in a Continuous Loss Position, at Fair Value: |  |
Less than 12 Months | 65,402 | 69,412
12 Months or Longer | 124,617 | 68,409
Total | $ 190,019 | $ 137,821
Number of Securities in a Continuous Loss Position | 458 | 366
Unrealized Losses on Securities in a Continuous Loss Position: |  |
Less than 12 Months | $ 618 | $ 498
12 Months or Longer | 3,006 | 1,468
Total | 3,624 | 1,966
State and Municipal Obligations |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-Maturity (Approximate Fair Value of $280,338 at December 31, 2018, and $335,901 at December 31, 2017) | 235,782 | 275,530
Held-To-Maturity Securities, at Fair Value | 233,359 | 275,353
Gross Unrealized Gains | 486 | 1,691
Gross Unrealized Losses | 2,909 | 1,868
Maturities of Debt Securities, at Amortized Cost: |  |
Within One Year | 27,426 |
From 1 - 5 Years | 93,495 |
From 5 - 10 Years | 112,499 |
Over 10 Years | 2,362 |
Maturities of Debt Securities, at Fair Value: |  |
Within One Year | 27,464 |
From 1 - 5 Years | 93,130 |
From 5 - 10 Years | 110,396 |
Over 10 Years | 2,369 |
Securities in a Continuous Loss Position, at Fair Value: |  |
Less than 12 Months | 32,093 | 55,648
12 Months or Longer | 110,947 | 65,152
Total | $ 143,040 | $ 120,800
Number of Securities in a Continuous Loss Position | 411 | 352
Unrealized Losses on Securities in a Continuous Loss Position: |  |
Less than 12 Months | $ 162 | $ 442
12 Months or Longer | 2,747 | 1,425
Total | 2,909 | 1,867
Collateralized Mortgage Backed Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-Maturity (Approximate Fair Value of $280,338 at December 31, 2018, and $335,901 at December 31, 2017) | 47,694 | 60,377
Held-To-Maturity Securities, at Fair Value | 46,979 | 60,548
Gross Unrealized Gains | 0 | 269
Gross Unrealized Losses | 715 | 98
Maturities of Debt Securities, at Amortized Cost: |  |
Within One Year | 0 |
From 1 - 5 Years | 47,694 |
From 5 - 10 Years | 0 |
Over 10 Years | 0 |
Maturities of Debt Securities, at Fair Value: |  |
Within One Year | 0 |
From 1 - 5 Years | 46,979 |
From 5 - 10 Years | 0 |
Over 10 Years | 0 |
Securities in a Continuous Loss Position, at Fair Value: |  |
Less than 12 Months | 33,309 | 13,764
12 Months or Longer | 13,670 | 3,257
Total | $ 46,979 | $ 17,021
Number of Securities in a Continuous Loss Position | 47 | 14
Unrealized Losses on Securities in a Continuous Loss Position: |  |
Less than 12 Months | $ 456 | $ 56
12 Months or Longer | 259 | 43
Total | 715 | 99
Collateralized Mortgage Backed Securities | Agency Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-Maturity (Approximate Fair Value of $280,338 at December 31, 2018, and $335,901 at December 31, 2017) | 2,180 | 2,680
Collateralized Mortgage Backed Securities | US Government-sponsored Enterprises Debt Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-Maturity (Approximate Fair Value of $280,338 at December 31, 2018, and $335,901 at December 31, 2017) | 45,514 | 57,697
Collateralized Mortgage Backed Securities | Fair Value, Measurements, Recurring | US Government-sponsored Enterprises Debt Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-To-Maturity Securities, at Fair Value | 44,836 | 57,887
Collateralized Mortgage Backed Securities | Fair Value, Measurements, Recurring | Agency Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-To-Maturity Securities, at Fair Value | $ 2,143 | $ 2,661

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