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Investment Securities Held to Maturity (Details) $ in Thousands | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Mar. 31, 2017 USD ($)
--- | --- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | $ 311,038 | $ 301,876 | $ 347,701
Equity Securities | 1,579 | 0 | 0
Gross Unrealized Gains | 354 | 935 | 1,519
Held-to-Maturity at Amortized Cost | 330,124 | 335,907 | 335,211
Held-To-Maturity Securities, at Fair Value | 324,938 | 335,901 | 335,105
Gross Unrealized Gains | 646 | 1,960 | 2,708
Gross Unrealized Losses | 5,832 | 1,966 | 2,813
Held-To-Maturity Securities, Pledged as Collateral | 307,273 | 318,622 | 316,966
Maturities of Debt Securities, at Amortized Cost: |  |  |
Within One Year | 35,115 |  |
From 1 - 5 Years | 132,555 |  |
From 5 - 10 Years | 159,054 |  |
Over 10 Years | 3,400 |  |
Maturities of Debt Securities, at Fair Value: |  |  |
Within One Year | 35,160 |  |
From 1 - 5 Years | 132,124 |  |
From 5 - 10 Years | 154,255 |  |
Over 10 Years | 3,399 |  |
Securities in a Continuous Loss Position, at Fair Value: |  |  |
Less than 12 Months | 154,771 | 69,412 | 103,132
12 Months or Longer | 68,269 | 68,409 | 657
Total | $ 223,040 | $ 137,821 | $ 103,789
Number of Securities in a Continuous Loss Position | 542 | 366 | 259
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |
Less than 12 Months | $ 2,748 | $ 498 | $ 2,810
12 Months or Longer | 3,084 | 1,468 | 3
Total | 5,832 | 1,966 | 2,813
State and Municipal Obligations |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 9,741 | 10,351 | 25,467
Gross Unrealized Gains | 7 | 9 | 40
Held-to-Maturity at Amortized Cost | 272,938 | 275,530 | 263,642
Held-To-Maturity Securities, at Fair Value | 268,605 | 275,353 | 263,255
Gross Unrealized Gains | 646 | 1,691 | 2,410
Gross Unrealized Losses | 4,979 | 1,868 | 2,796
Maturities of Debt Securities, at Amortized Cost: |  |  |
Within One Year | 35,115 |  |
From 1 - 5 Years | 81,312 |  |
From 5 - 10 Years | 153,111 |  |
Over 10 Years | 3,400 |  |
Maturities of Debt Securities, at Fair Value: |  |  |
Within One Year | 35,160 |  |
From 1 - 5 Years | 81,634 |  |
From 5 - 10 Years | 148,412 |  |
Over 10 Years | 3,399 |  |
Securities in a Continuous Loss Position, at Fair Value: |  |  |
Less than 12 Months | 101,695 | 55,648 | 95,450
12 Months or Longer | 65,012 | 65,152 | 657
Total | $ 166,707 | $ 120,800 | $ 96,107
Number of Securities in a Continuous Loss Position | 495 | 352 | 251
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |
Less than 12 Months | $ 1,981 | $ 442 | $ 2,793
12 Months or Longer | 2,998 | 1,425 | 3
Total | 4,979 | 1,867 | 2,796
Mortgage-Backed Securities - Residential |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 240,033 | 229,077 | 170,601
Gross Unrealized Gains | 347 | 485 | 934
Held-to-Maturity at Amortized Cost | 57,186 | 60,377 | 71,569
Held-To-Maturity Securities, at Fair Value | 56,333 | 60,548 | 71,850
Gross Unrealized Gains | 0 | 269 | 298
Gross Unrealized Losses | 853 | 98 | 17
Maturities of Debt Securities, at Amortized Cost: |  |  |
Within One Year | 0 |  |
From 1 - 5 Years | 51,243 |  |
From 5 - 10 Years | 5,943 |  |
Over 10 Years | 0 |  |
Maturities of Debt Securities, at Fair Value: |  |  |
Within One Year | 0 |  |
From 1 - 5 Years | 50,490 |  |
From 5 - 10 Years | 5,843 |  |
Over 10 Years | 0 |  |
Securities in a Continuous Loss Position, at Fair Value: |  |  |
Less than 12 Months | 53,076 | 13,764 | 7,682
12 Months or Longer | 3,257 | 3,257 | 0
Total | $ 56,333 | $ 17,021 | $ 7,682
Number of Securities in a Continuous Loss Position | 47 | 14 | 8
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |
Less than 12 Months | $ 767 | $ 56 | $ 17
12 Months or Longer | 86 | 43 | 0
Total | 853 | 99 | 17
Mortgage-Backed Securities - Residential | Agency Securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-Maturity at Amortized Cost | 2,530 | 2,680 | 3,106
Mortgage-Backed Securities - Residential | US Government-sponsored Enterprises Debt Securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-Maturity at Amortized Cost | 54,656 | 57,697 | 68,463
Corporate and Other Debt Securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 1,000 | 1,000 | 3,501
Gross Unrealized Gains | 0 | 0 | 0
Held-to-Maturity at Amortized Cost | 0 | 0 | 0
Held-To-Maturity Securities, at Fair Value | 0 | 0 | 0
Gross Unrealized Gains | 0 | 0 | 0
Gross Unrealized Losses | 0 | 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 | 0
12 Months or Longer | 0 | 0 | 0
Total | $ 0 | $ 0 | $ 0
Number of Securities in a Continuous Loss Position | 0 | 0 | 0
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |
Less than 12 Months | $ 0 | $ 0 | $ 0
12 Months or Longer | 0 | 0 | 0
Total | 0 | 0 | 0
Agency Securities | Mortgage-Backed Securities - Residential |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 59,446 | 40,832 | 1,616
Fair Value, Measurements, Recurring |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Equity Securities | 1,579 |  |
Fair Value, Measurements, Recurring | Mortgage-Backed Securities - Residential | US Government-sponsored Enterprises Debt Securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-To-Maturity Securities, at Fair Value | 53,850 | 57,887 | 68,729
Fair Value, Measurements, Recurring | Agency Securities | Mortgage-Backed Securities - Residential |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-To-Maturity Securities, at Fair Value | $ 2,483 | $ 2,661 | $ 3,121

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