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Securities, Held to Maturity (Details) $ in Thousands | Sep. 30, 2016 USD ($) Position | Dec. 31, 2015 USD ($) Position
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | $ 485,877 | $ 471,031
Unrealized gains | 10,162 | 3,794
Unrealized losses | (443) | (1,685)
Estimated fair value | 495,596 | 473,140
Unrealized Loss Position, Fair Value [Abstract] |  |
Less Than 12 Months, Fair Value | 5,501 | 117,129
12 Months or Longer, Fair Value | 37,888 | 41,523
Total, Fair Value | 43,389 | 158,652
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less Than 12 Months, Unrealized Losses | (57) | (406)
12 Months or Longer, Unrealized Losses | (386) | (1,279)
Total, Unrealized Losses | $ (443) | $ (1,685)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less Than 12 Months, Number of Positions | Position | 9 | 16
12 Months or Longer, Number of Positions | Position | 4 | 4
Total, Number of Positions | Position | 13 | 20
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Within one year | $ 34,787 |
From one to five years | 25,392 |
From five to ten years | 123,615 |
After ten years | 302,083 |
Amortized cost | 485,877 | $ 471,031
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Within one year | 34,790 |
From one to five years | 25,639 |
From five to ten years | 126,865 |
After ten years | 308,302 |
Total, Fair Value | 495,596 | 473,140
Mortgage-Backed [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less Than 12 Months, Fair Value |  | 9,325
12 Months or Longer, Fair Value |  | 0
Total, Fair Value |  | 9,325
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less Than 12 Months, Unrealized Losses |  | (107)
12 Months or Longer, Unrealized Losses |  | 0
Total, Unrealized Losses |  | $ (107)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less Than 12 Months, Number of Positions | Position |  | 1
12 Months or Longer, Number of Positions | Position |  | 0
Total, Number of Positions | Position |  | 1
Mortgage-backed Securities, Issued by US Government-Sponsored Enterprises [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 49,229 | $ 9,432
Unrealized gains | 617 | 0
Unrealized losses | 0 | (107)
Estimated fair value | 49,846 | 9,325
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Amortized cost | 49,229 | 9,432
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Total, Fair Value | 49,846 | 9,325
Mortgage-backed Securities, Issued by US Government Agency Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 549 | 611
Unrealized gains | 101 | 95
Unrealized losses | 0 | 0
Estimated fair value | 650 | 706
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Amortized cost | 549 | 611
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Total, Fair Value | 650 | 706
Collateralized Mortgage Obligations [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less Than 12 Months, Fair Value | 0 | 105,604
12 Months or Longer, Fair Value | 37,888 | 41,523
Total, Fair Value | 37,888 | 147,127
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less Than 12 Months, Unrealized Losses | 0 | (281)
12 Months or Longer, Unrealized Losses | (386) | (1,279)
Total, Unrealized Losses | $ (386) | $ (1,560)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less Than 12 Months, Number of Positions | Position | 0 | 12
12 Months or Longer, Number of Positions | Position | 4 | 4
Total, Number of Positions | Position | 4 | 16
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | $ 237,819 | $ 272,550
Unrealized gains | 5,314 | 1,411
Unrealized losses | (386) | (1,560)
Estimated fair value | 242,747 | 272,401
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Amortized cost | 237,819 | 272,550
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Total, Fair Value | 242,747 | 272,401
State & Municipal [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 198,280 | 188,438
Unrealized gains | 4,130 | 2,288
Unrealized losses | (57) | (18)
Estimated fair value | 202,353 | 190,708
Unrealized Loss Position, Fair Value [Abstract] |  |
Less Than 12 Months, Fair Value | 5,501 | 2,200
12 Months or Longer, Fair Value | 0 | 0
Total, Fair Value | 5,501 | 2,200
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less Than 12 Months, Unrealized Losses | (57) | (18)
12 Months or Longer, Unrealized Losses | 0 | 0
Total, Unrealized Losses | $ (57) | $ (18)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less Than 12 Months, Number of Positions | Position | 9 | 3
12 Months or Longer, Number of Positions | Position | 0 | 0
Total, Number of Positions | Position | 9 | 3
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Amortized cost | $ 198,280 | $ 188,438
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Total, Fair Value | $ 202,353 | $ 190,708

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