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Investment Securities - Held to Maturity (Details) $ in Thousands | Sep. 30, 2019 USD ($) security | Dec. 31, 2018 USD ($) security | Sep. 30, 2018 USD ($) security
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Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-To-Maturity Securities, at Amortized Cost | $ 255,095 | $ 283,476 | $ 289,952
Held-To-Maturity Securities, at Fair Value | 259,128 | 280,338 | 282,719
Gross Unrealized Gains | 4,077 | 486 | 261
Gross Unrealized Losses | 44 | 3,624 | 7,494
Maturities of Debt Securities, at Amortized Cost: |  |  |
Within One Year | 25,665 |  |
From 1 - 5 Years | 148,403 |  |
From 5 - 10 Years | 79,378 |  |
Over 10 Years | 1,649 |  |
Maturities of Debt Securities, at Fair Value: |  |  |
Within One Year | 25,696 |  |
From 1 - 5 Years | 150,389 |  |
From 5 - 10 Years | 81,359 |  |
Over 10 Years | 1,684 |  |
Securities in a Continuous Loss Position, at Fair Value: |  |  |
Less than 12 Months | 3,845 | 65,402 | 142,319
12 Months or Longer | 8,475 | 124,617 | 89,165
Total | $ 12,320 | $ 190,019 | $ 231,484
Number of Securities in a Continuous Loss Position | security | 38 | 458 | 582
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |
Less than 12 Months | $ 10 | $ 618 | $ 2,746
12 Months or Longer | 34 | 3,006 | 4,748
Total | 44 | 3,624 | 7,494
Equity Securities | 1,996 | 1,774 | 1,916
State and Municipal Obligations |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-To-Maturity Securities, at Amortized Cost | 215,661 | 235,782 | 239,367
Held-To-Maturity Securities, at Fair Value | 219,296 | 233,359 | 233,557
Gross Unrealized Gains | 3,669 | 486 | 261
Gross Unrealized Losses | 34 | 2,909 | 6,071
Maturities of Debt Securities, at Amortized Cost: |  |  |
Within One Year | 21,974 |  |
From 1 - 5 Years | 112,660 |  |
From 5 - 10 Years | 79,378 |  |
Over 10 Years | 1,649 |  |
Maturities of Debt Securities, at Fair Value: |  |  |
Within One Year | 22,007 |  |
From 1 - 5 Years | 114,246 |  |
From 5 - 10 Years | 81,359 |  |
Over 10 Years | 1,684 |  |
Securities in a Continuous Loss Position, at Fair Value: |  |  |
Less than 12 Months | 763 | 32,093 | 95,944
12 Months or Longer | 6,764 | 110,947 | 86,378
Total | $ 7,527 | $ 143,040 | $ 182,322
Number of Securities in a Continuous Loss Position | security | 19 | 411 | 535
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |
Less than 12 Months | $ 1 | $ 162 | $ 1,443
12 Months or Longer | 33 | 2,747 | 4,628
Total | 34 | 2,909 | 6,071
Mortgage-Backed Securities - Residential |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-To-Maturity Securities, at Amortized Cost | 39,434 | 47,694 | 50,585
Held-To-Maturity Securities, at Fair Value | 39,832 | 46,979 | 49,162
Gross Unrealized Gains | 408 | 0 | 0
Gross Unrealized Losses | 10 | 715 | 1,423
Maturities of Debt Securities, at Amortized Cost: |  |  |
Within One Year | 3,691 |  |
From 1 - 5 Years | 35,743 |  |
From 5 - 10 Years | 0 |  |
Over 10 Years | 0 |  |
Maturities of Debt Securities, at Fair Value: |  |  |
Within One Year | 3,689 |  |
From 1 - 5 Years | 36,143 |  |
From 5 - 10 Years | 0 |  |
Over 10 Years | 0 |  |
Securities in a Continuous Loss Position, at Fair Value: |  |  |
Less than 12 Months | 3,082 | 33,309 | 46,375
12 Months or Longer | 1,711 | 13,670 | 2,787
Total | $ 4,793 | $ 46,979 | $ 49,162
Number of Securities in a Continuous Loss Position | security | 19 | 47 | 47
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |
Less than 12 Months | $ 9 | $ 456 | $ 1,303
12 Months or Longer | 1 | 259 | 120
Total | 10 | 715 | 1,423
Fair Value, Measurements, Recurring |  |  |
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |
Equity Securities | 1,996 | 1,774 | 1,916
Collateral Pledged |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-To-Maturity Securities, Pledged as Collateral | 244,373 | 266,341 | 268,229
US Government Agencies Debt Securities | Mortgage-Backed Securities - Residential |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-To-Maturity Securities, at Amortized Cost | 1,844 | 2,180 | 3,147
US Government Agencies Debt Securities | Fair Value, Measurements, Recurring | Mortgage-Backed Securities - Residential |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-To-Maturity Securities, at Fair Value | 1,854 | 2,143 | 2,222
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 | 37,590 | 45,514 | 47,438
US Government-sponsored Enterprises Debt Securities | Fair Value, Measurements, Recurring | Mortgage-Backed Securities - Residential |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-To-Maturity Securities, at Fair Value | $ 37,978 | $ 44,836 | $ 46,940

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