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Investment Securities Held to Maturity (Details) $ in Thousands | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jun. 30, 2016 USD ($)
--- | --- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-Maturity at Amortized Cost | $ 348,018 | $ 345,427 | $ 343,814
Held-To-Maturity Securities, at Fair Value | 350,355 | 343,751 | 354,778
Gross Unrealized Gains | 3,885 | 2,316 | 10,965
Gross Unrealized Losses | 1,548 | 3,992 | 1
Held-To-Maturity Securities, Pledged as Collateral | 327,820 | 321,202 | 327,820
Maturities of Debt Securities, at Amortized Cost: |  |  |
Within One Year | 13,986 |  |
From 1 - 5 Years | 152,578 |  |
From 5 - 10 Years | 170,188 |  |
Over 10 Years | 11,266 |  |
Maturities of Debt Securities, at Fair Value: |  |  |
Within One Year | 14,006 |  |
From 1 - 5 Years | 154,627 |  |
From 5 - 10 Years | 170,519 |  |
Over 10 Years | 11,203 |  |
Securities in a Continuous Loss Position, at Fair Value: |  |  |
Less than 12 Months | 97,384 | 120,561 | 0
12 Months or Longer | 403 | 12,363 | 659
Total | $ 97,787 | $ 132,924 | $ 659
Number of Securities in a Continuous Loss Position | 272 | 360 | 3
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |
Less than 12 Months | $ 1,546 | $ 3,298 | $ 0
12 Months or Longer | 2 | 694 | 1
Total | 1,548 | 3,992 | 1
State and Municipal Obligations |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-Maturity at Amortized Cost | 280,485 | 268,892 | 257,982
Held-To-Maturity Securities, at Fair Value | 282,157 | 267,127 | 265,983
Gross Unrealized Gains | 3,208 | 2,058 | 8,002
Gross Unrealized Losses | 1,536 | 3,823 | 1
Maturities of Debt Securities, at Amortized Cost: |  |  |
Within One Year | 13,986 |  |
From 1 - 5 Years | 91,072 |  |
From 5 - 10 Years | 164,161 |  |
Over 10 Years | 11,266 |  |
Maturities of Debt Securities, at Fair Value: |  |  |
Within One Year | 14,006 |  |
From 1 - 5 Years | 92,549 |  |
From 5 - 10 Years | 164,399 |  |
Over 10 Years | 11,203 |  |
Securities in a Continuous Loss Position, at Fair Value: |  |  |
Less than 12 Months | 93,046 | 107,255 | 0
12 Months or Longer | 403 | 12,363 | 659
Total | $ 93,449 | $ 119,618 | $ 659
Number of Securities in a Continuous Loss Position | 263 | 347 | 3
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |
Less than 12 Months | $ 1,534 | $ 3,129 | $ 0
12 Months or Longer | 2 | 694 | 1
Total | 1,536 | 3,823 | 1
Mortgage-Backed Securities - Residential |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-Maturity at Amortized Cost | 67,533 | 75,535 | 84,832
Held-To-Maturity Securities, at Fair Value | 68,198 | 75,624 | 87,795
Gross Unrealized Gains | 677 | 258 | 2,963
Gross Unrealized Losses | 12 | 169 | 0
Maturities of Debt Securities, at Amortized Cost: |  |  |
Within One Year | 0 |  |
From 1 - 5 Years | 61,506 |  |
From 5 - 10 Years | 6,027 |  |
Over 10 Years | 0 |  |
Maturities of Debt Securities, at Fair Value: |  |  |
Within One Year | 0 |  |
From 1 - 5 Years | 62,078 |  |
From 5 - 10 Years | 6,120 |  |
Over 10 Years | 0 |  |
Securities in a Continuous Loss Position, at Fair Value: |  |  |
Less than 12 Months | 4,338 | 13,306 | 0
12 Months or Longer | 0 | 0 | 0
Total | $ 4,338 | $ 13,306 | $ 0
Number of Securities in a Continuous Loss Position | 9 | 13 | 0
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |
Less than 12 Months | $ 12 | $ 169 | $ 0
12 Months or Longer | 0 | 0 | 0
Total | 12 | 169 | 0
Mortgage-Backed Securities - Residential | Agency Securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-Maturity at Amortized Cost | 3,106 | 3,206 | 3,497
Mortgage-Backed Securities - Residential | US Government-sponsored Enterprises Debt Securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-Maturity at Amortized Cost | 64,427 | 72,329 | 81,335
Corporate and Other Debt Securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-Maturity at Amortized Cost | 0 | 1,000 | 1,000
Held-To-Maturity Securities, at Fair Value | 0 | 1,000 | 1,000
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
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 | 65,077 | 72,402 | 84,173
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 | $ 3,121 | $ 3,222 | $ 3,622

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- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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