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Investment Securities Held to Maturity (Details) $ in Thousands | Jun. 30, 2019 USD ($) security | Dec. 31, 2018 USD ($) security | Jun. 30, 2018 USD ($) security
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Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-To-Maturity Securities, at Amortized Cost | $ 262,541 | $ 283,476 | $ 297,885
Held-To-Maturity Securities, at Fair Value | 266,068 | 280,338 | 292,605
Gross Unrealized Gains | 3,621 | 486 | 497
Gross Unrealized Losses | 94 | 3,624 | 5,777
Maturities of Debt Securities, at Amortized Cost: |  |  |
Within One Year | 25,944 |  |
From 1 - 5 Years | 154,910 |  |
From 5 - 10 Years | 80,037 |  |
Over 10 Years | 1,650 |  |
Maturities of Debt Securities, at Fair Value: |  |  |
Within One Year | 26,016 |  |
From 1 - 5 Years | 156,780 |  |
From 5 - 10 Years | 81,593 |  |
Over 10 Years | 1,679 |  |
Securities in a Continuous Loss Position, at Fair Value: |  |  |
Less than 12 Months | 92 | 65,402 | 118,589
12 Months or Longer | 16,085 | 124,617 | 93,735
Total | $ 16,177 | $ 190,019 | $ 212,324
Number of Securities in a Continuous Loss Position | security | 37 | 458 | 512
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |
Less than 12 Months | $ 0 | $ 618 | $ 1,654
12 Months or Longer | 94 | 3,006 | 4,123
Total | 94 | 3,624 | 5,777
Equity Securities | 1,850 | 1,774 | 1,802
State and Municipal Obligations |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-To-Maturity Securities, at Amortized Cost | 220,529 | 235,782 | 244,016
Held-To-Maturity Securities, at Fair Value | 223,654 | 233,359 | 239,841
Gross Unrealized Gains | 3,206 | 486 | 497
Gross Unrealized Losses | 81 | 2,909 | 4,672
Maturities of Debt Securities, at Amortized Cost: |  |  |
Within One Year | 24,060 |  |
From 1 - 5 Years | 114,782 |  |
From 5 - 10 Years | 80,037 |  |
Over 10 Years | 1,650 |  |
Maturities of Debt Securities, at Fair Value: |  |  |
Within One Year | 24,109 |  |
From 1 - 5 Years | 116,273 |  |
From 5 - 10 Years | 81,593 |  |
Over 10 Years | 1,679 |  |
Securities in a Continuous Loss Position, at Fair Value: |  |  |
Less than 12 Months | 159 | 32,093 | 68,612
12 Months or Longer | 14,374 | 110,947 | 90,948
Total | $ 14,533 | $ 143,040 | $ 159,560
Number of Securities in a Continuous Loss Position | security | 36 | 411 | 465
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |
Less than 12 Months | $ 0 | $ 162 | $ 633
12 Months or Longer | 81 | 2,747 | 4,039
Total | 81 | 2,909 | 4,672
Mortgage-Backed Securities - Residential |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-To-Maturity Securities, at Amortized Cost | 42,012 | 47,694 | 53,869
Held-To-Maturity Securities, at Fair Value | 42,414 | 46,979 | 52,764
Gross Unrealized Gains | 415 | 0 | 0
Gross Unrealized Losses | 13 | 715 | 1,105
Maturities of Debt Securities, at Amortized Cost: |  |  |
Within One Year | 1,884 |  |
From 1 - 5 Years | 40,128 |  |
From 5 - 10 Years | 0 |  |
Over 10 Years | 0 |  |
Maturities of Debt Securities, at Fair Value: |  |  |
Within One Year | 1,907 |  |
From 1 - 5 Years | 40,507 |  |
From 5 - 10 Years | 0 |  |
Over 10 Years | 0 |  |
Securities in a Continuous Loss Position, at Fair Value: |  |  |
Less than 12 Months | (67) | 33,309 | 49,977
12 Months or Longer | 1,711 | 13,670 | 2,787
Total | $ 1,644 | $ 46,979 | $ 52,764
Number of Securities in a Continuous Loss Position | security | 1 | 47 | 47
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |
Less than 12 Months | $ 0 | $ 456 | $ 1,021
12 Months or Longer | 13 | 259 | 84
Total | 13 | 715 | 1,105
Fair Value, Measurements, Recurring |  |  |
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |
Equity Securities | 1,850 | 1,774 | 1,802
Collateral Pledged |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-To-Maturity Securities, Pledged as Collateral | 251,639 | 266,341 | 278,627
US Government Agencies Debt Securities | Mortgage-Backed Securities - Residential |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-To-Maturity Securities, at Amortized Cost | 1,942 | 2,180 | 3,265
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 | 1,948 | 2,143 | 2,346
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 | 40,070 | 45,514 | 50,604
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 | $ 40,466 | $ 44,836 | $ 50,418

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