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Investment Securities Held to Maturity (Details) $ in Thousands | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Mar. 31, 2016 USD ($)
--- | --- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-Maturity at Amortized Cost | $ 335,211 | $ 345,427 | $ 315,284
Held-To-Maturity Securities, at Fair Value | 335,105 | 343,751 | 324,337
Gross Unrealized Gains | 2,708 | 2,316 | 9,061
Gross Unrealized Losses | 2,813 | 3,992 | 8
Held-To-Maturity Securities, Pledged as Collateral | 316,966 | 321,202 | 299,767
Maturities of Debt Securities, at Amortized Cost: |  |  |
Within One Year | 29,743 |  |
From 1 - 5 Years | 150,042 |  |
From 5 - 10 Years | 151,667 |  |
Over 10 Years | 3,758 |  |
Maturities of Debt Securities, at Fair Value: |  |  |
Within One Year | 29,788 |  |
From 1 - 5 Years | 151,886 |  |
From 5 - 10 Years | 149,675 |  |
Over 10 Years | 3,756 |  |
Securities in a Continuous Loss Position, at Fair Value: |  |  |
Less than 12 Months | 103,132 | 120,561 | 4,293
12 Months or Longer | 657 | 12,363 | 658
Total | $ 103,789 | $ 132,924 | $ 4,951
Number of Securities in a Continuous Loss Position | 259 | 360 | 8
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |
Less than 12 Months | $ 2,810 | $ 3,298 | $ 6
12 Months or Longer | 3 | 694 | 2
Total | 2,813 | 3,992 | 8
State and Municipal Obligations |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-Maturity at Amortized Cost | 263,642 | 268,892 | 224,831
Held-To-Maturity Securities, at Fair Value | 263,255 | 267,127 | 231,598
Gross Unrealized Gains | 2,410 | 2,058 | 6,769
Gross Unrealized Losses | 2,796 | 3,823 | 2
Maturities of Debt Securities, at Amortized Cost: |  |  |
Within One Year | 29,743 |  |
From 1 - 5 Years | 85,621 |  |
From 5 - 10 Years | 144,519 |  |
Over 10 Years | 3,758 |  |
Maturities of Debt Securities, at Fair Value: |  |  |
Within One Year | 29,788 |  |
From 1 - 5 Years | 87,239 |  |
From 5 - 10 Years | 142,472 |  |
Over 10 Years | 3,756 |  |
Securities in a Continuous Loss Position, at Fair Value: |  |  |
Less than 12 Months | 95,450 | 107,255 | 648
12 Months or Longer | 657 | 12,363 | 658
Total | $ 96,107 | $ 119,618 | $ 1,306
Number of Securities in a Continuous Loss Position | 251 | 347 | 7
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |
Less than 12 Months | $ 2,793 | $ 3,129 | $ 0
12 Months or Longer | 3 | 694 | 2
Total | 2,796 | 3,823 | 2
Mortgage-Backed Securities - Residential |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-Maturity at Amortized Cost | 71,569 | 75,535 | 89,453
Held-To-Maturity Securities, at Fair Value | 71,850 | 75,624 | 91,739
Gross Unrealized Gains | 298 | 258 | 2,292
Gross Unrealized Losses | 17 | 169 | 6
Maturities of Debt Securities, at Amortized Cost: |  |  |
Within One Year | 0 |  |
From 1 - 5 Years | 64,421 |  |
From 5 - 10 Years | 7,148 |  |
Over 10 Years | 0 |  |
Maturities of Debt Securities, at Fair Value: |  |  |
Within One Year | 0 |  |
From 1 - 5 Years | 64,647 |  |
From 5 - 10 Years | 7,203 |  |
Over 10 Years | 0 |  |
Securities in a Continuous Loss Position, at Fair Value: |  |  |
Less than 12 Months | 7,682 | 13,306 | 3,645
12 Months or Longer | 0 | 0 | 0
Total | $ 7,682 | $ 13,306 | $ 3,645
Number of Securities in a Continuous Loss Position | 8 | 13 | 1
Unrealized Losses on Securities in a Continuous Loss Position: |  |  |
Less than 12 Months | $ 17 | $ 169 | $ 6
12 Months or Longer | 0 | 0 | 0
Total | 17 | 169 | 6
Mortgage-Backed Securities - Residential | Agency Securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-Maturity at Amortized Cost | 3,106 | 3,206 | 3,674
Mortgage-Backed Securities - Residential | US Government-sponsored Enterprises Debt Securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-Maturity at Amortized Cost | 68,463 | 72,329 | 85,779
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 | 68,729 | 72,402 | 87,945
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 | $ 3,794

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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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