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Securities (Schedule of Contractual Maturities of Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Available for Sale, Amortized Cost |  |
Available for sale Securities, Amortized Cost | $ 413,496 | $ 363,366
Available for Sale, Fair Value |  |
Available for sale Securities, Fair Value, Total | 415,943 | 363,644
Held to Maturity, Amortized Cost |  |
Held to maturity Securities, Amortized Cost | 498,392 | 487,076
Held to Maturity, Fair Value |  |
Held to Maturity, Fair Value, Total | 499,059 | $ 485,650
Debt Securities |  |
Available for Sale, Amortized Cost |  |
Available for Sale, Amortized Cost, Due in one year or less | 3,660 |
Available for Sale, Amortized Cost, Due after one year to five years | 35,607 |
Available for Sale, Amortized Cost, Due after five to ten years | 96,985 |
Available for Sale, Amortized Cost, Due after ten years | 258,083 |
Available for sale Securities, Amortized Cost | 394,335 |
Available for Sale, Fair Value |  |
Available for Sale, Fair Value, Due in one year or less | 3,672 |
Available for Sale, Fair Value, Due after one year to five years | 36,122 |
Available for Sale, Fair Value, Due after five to ten years | 97,760 |
Available for Sale, Fair Value, Due after ten years | 258,566 |
Available for sale Securities, Fair Value, Total | 396,120 |
Held to Maturity, Amortized Cost |  |
Held to Maturity, Amortized Cost, Due in one year or less | 0 |
Held to Maturity, Amortized Cost, Due after one year to five years | 15,824 |
Held to Maturity, Amortized Cost, Due after five to ten years | 19,574 |
Held to Maturity, Amortized Cost, Due after ten years | 462,994 |
Held to maturity Securities, Amortized Cost | 498,392 |
Held to Maturity, Fair Value |  |
Held to Maturity, Fair Value, Due in one year or less | 0 |
Held to Maturity, Fair Value, Due after one year to five years | 16,064 |
Held to Maturity, Fair Value, Due after five to ten years | 20,045 |
Held to Maturity, Fair Value, Due after ten years | 462,950 |
Held to Maturity, Fair Value, Total | 499,059 |
Equity securities |  |
Available for Sale, Amortized Cost |  |
Available for Sale, Amortized Cost, Marketable equity securities | 19,161 |
Available for Sale, Fair Value |  |
Available for Sale, Fair Value, Marketable equity securities | 19,823 |
Held to Maturity, Amortized Cost |  |
Held to maturity Securities, Amortized Cost | 0 |
Held to Maturity, Fair Value |  |
Held to Maturity, Fair Value, Total | $ 0 |

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