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Investment Securities Held to Maturity (Details) $ in Thousands | Sep. 30, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($)
--- | --- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-Maturity | $ 338,238 | $ 320,611 | $ 317,480
Held-to-Maturity Securities, at Fair Value | 347,441 | 325,930 | 324,009
Gross Unrealized Gains | 9,273 | 5,487 | 6,614
Gross Unrealized Losses | 70 | 168 | 85
Held-To-Maturity Securities, Pledged as Collateral | 320,774 | 299,767 | 296,921
Maturities of Debt Securities at Amortized Cost |  |  |
Within One Year | 35,911 |  |
From 1 - 5 Years | 159,886 |  |
From 5 - 10 Years | 137,452 |  |
Over 10 Years | 4,989 |  |
Maturities of Debt Securities, at Fair Value |  |  |
Within One Year | 35,966 |  |
From 1 - 5 Years | 164,659 |  |
From 5 - 10 Years | 141,681 |  |
Over 10 Years | 5,135 |  |
Securities in a Continuous Loss Position, at Fair Value |  |  |
Less than 12 Months | 11,891 | 8,302 | 0
12 Months or Longer | 1,172 | 15,918 | 14,896
Total | $ 13,063 | $ 24,220 | $ 14,896
Number of Securities in a Continuous Loss Position, in number of securities | 3 | 62 | 51
Unrealized Losses on Securities in a Continuous Loss Position |  |  |
Less than 12 Months | $ 68 | $ 104 | $ 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2 | 64 | 85
Total | 70 | 168 | 85
State and Municipal Obligations [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-Maturity | 257,255 | 226,053 | 218,502
Held-to-Maturity Securities, at Fair Value | 263,897 | 230,621 | 223,050
Gross Unrealized Gains | 6,712 | 4,619 | 4,633
Gross Unrealized Losses | 70 | 51 | 85
Maturities of Debt Securities at Amortized Cost |  |  |
Within One Year | 35,911 |  |
From 1 - 5 Years | 87,464 |  |
From 5 - 10 Years | 129,891 |  |
Over 10 Years | 3,989 |  |
Maturities of Debt Securities, at Fair Value |  |  |
Within One Year | 35,966 |  |
From 1 - 5 Years | 89,979 |  |
From 5 - 10 Years | 133,817 |  |
Over 10 Years | 4,135 |  |
Securities in a Continuous Loss Position, at Fair Value |  |  |
Less than 12 Months | 11,891 | 2,302 | 0
12 Months or Longer | 1,172 | 11,764 | 14,896
Total | $ 13,063 | $ 14,066 | $ 14,896
Number of Securities in a Continuous Loss Position, in number of securities | 3 | 54 | 51
Unrealized Losses on Securities in a Continuous Loss Position |  |  |
Less than 12 Months | $ 68 | $ 11 | $ 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2 | 40 | 85
Total | 70 | 51 | 85
Mortgage-Backed Securities - Residential [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-Maturity | 79,983 | 93,558 | 97,978
Held-to-Maturity Securities, at Fair Value | 82,544 | 94,309 | 99,959
Gross Unrealized Gains | 2,561 | 868 | 1,981
Gross Unrealized Losses | 0 | 117 | 0
Maturities of Debt Securities at Amortized Cost |  |  |
Within One Year | 0 |  |
From 1 - 5 Years | 72,422 |  |
From 5 - 10 Years | 7,561 |  |
Over 10 Years | 0 |  |
Maturities of Debt Securities, at Fair Value |  |  |
Within One Year | 0 |  |
From 1 - 5 Years | 74,680 |  |
From 5 - 10 Years | 7,864 |  |
Over 10 Years | 0 |  |
Securities in a Continuous Loss Position, at Fair Value |  |  |
Less than 12 Months | 0 | 6,000 | 0
12 Months or Longer | 0 | 4,154 | 0
Total | $ 0 | $ 10,154 | $ 0
Number of Securities in a Continuous Loss Position, in number of securities | 0 | 8 | 0
Unrealized Losses on Securities in a Continuous Loss Position |  |  |
Less than 12 Months | $ 0 | $ 93 | $ 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 24 | 0
Total | 0 | 117 | 0
Mortgage-Backed Securities - Residential [Member] | U.S. Government Agency Obligations [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-Maturity | 3,497 | 3,800 | 27,800
Held-to-Maturity Securities, at Fair Value | 3,622 | 3,940 | 28,400
Mortgage-Backed Securities - Residential [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-Maturity | 76,486 | 89,758 | 70,200
Held-to-Maturity Securities, at Fair Value | 78,922 | 90,469 | 71,500
Corporate and Other Debt Securities [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-Maturity | 1,000 | 1,000 | 1,000
Held-to-Maturity Securities, at Fair Value | 1,000 | 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 | 1,000 |  |
Maturities of Debt Securities, at Fair Value |  |  |
Within One Year | 0 |  |
From 1 - 5 Years | 0 |  |
From 5 - 10 Years | 0 |  |
Over 10 Years | 1,000 |  |
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, in number of securities | 0 | 0 | 0
Unrealized Losses on Securities in a Continuous Loss Position |  |  |
Less than 12 Months | $ 0 | $ 0 | $ 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0 | 0
Total | $ 0 | $ 0 | $ 0

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