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Securities, Held to Maturity (Details) $ in Thousands | Jun. 30, 2016 USD ($) Position | Dec. 31, 2015 USD ($) Position
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | $ 500,840 | $ 471,031
Unrealized gains | 11,777 | 3,794
Unrealized losses | (268) | (1,685)
Estimated fair value | 512,349 | 473,140
Unrealized Loss Position, Fair Value [Abstract] |  |
Less Than 12 Months, Fair Value | 918 | 117,129
12 Months or Longer, Fair Value | 39,767 | 41,523
Total, Fair Value | 40,685 | 158,652
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less Than 12 Months, Unrealized Losses | (12) | (406)
12 Months or Longer, Unrealized Losses | (256) | (1,279)
Total, Unrealized Losses | $ (268) | $ (1,685)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | Position | 2 | 16
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater Than or Equal to One Year | Position | 4 | 4
Total, Number of Positions | Position | 6 | 20
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Within one year | $ 39,152 |
From one to five years | 23,575 |
From five to ten years | 118,985 |
After ten years | 319,128 |
Amortized cost | 500,840 | $ 471,031
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Within one year | 39,185 |
From one to five years | 23,863 |
From five to ten years | 122,641 |
After ten years | 326,660 |
Total, Fair Value | 512,349 | 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] |  |
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | Position |  | 1
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater Than or Equal to One Year | 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 | 51,206 | $ 9,432
Unrealized gains | 505 | 0
Unrealized losses | 0 | (107)
Estimated fair value | 51,711 | 9,325
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Amortized cost | 51,206 | 9,432
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Total, Fair Value | 51,711 | 9,325
Mortgage-backed Securities, Issued by US Government Agency Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 566 | 611
Unrealized gains | 105 | 95
Unrealized losses | 0 | 0
Estimated fair value | 671 | 706
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Amortized cost | 566 | 611
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Total, Fair Value | 671 | 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 | 39,767 | 41,523
Total, Fair Value | 39,767 | 147,127
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less Than 12 Months, Unrealized Losses | 0 | (281)
12 Months or Longer, Unrealized Losses | (256) | (1,279)
Total, Unrealized Losses | $ (256) | $ (1,560)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | Position | 0 | 12
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater Than or Equal to One Year | 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 | $ 251,069 | $ 272,550
Unrealized gains | 6,259 | 1,411
Unrealized losses | (256) | (1,560)
Estimated fair value | 257,072 | 272,401
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Amortized cost | 251,069 | 272,550
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Total, Fair Value | 257,072 | 272,401
State & Municipal [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 197,999 | 188,438
Unrealized gains | 4,908 | 2,288
Unrealized losses | (12) | (18)
Estimated fair value | 202,895 | 190,708
Unrealized Loss Position, Fair Value [Abstract] |  |
Less Than 12 Months, Fair Value | 918 | 2,200
12 Months or Longer, Fair Value | 0 | 0
Total, Fair Value | 918 | 2,200
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less Than 12 Months, Unrealized Losses | (12) | (18)
12 Months or Longer, Unrealized Losses | 0 | 0
Total, Unrealized Losses | $ (12) | $ (18)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | Position | 2 | 3
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater Than or Equal to One Year | Position | 0 | 0
Total, Number of Positions | Position | 2 | 3
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Amortized cost | $ 197,999 | $ 188,438
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Total, Fair Value | $ 202,895 | $ 190,708

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