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Securities (Schedule of Contractual Maturities of Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Available for Sale, Amortized Cost |  |
Available for sale Securities, Amortized Cost | $ 426,340 | $ 363,366
Available for Sale, Fair Value |  |
Available for sale Securities, Fair Value, Total | 429,125 | 363,644
Held to Maturity, Amortized Cost |  |
Held to maturity Securities, Amortized Cost | 478,798 | 487,076
Held to Maturity, Fair Value |  |
Held to Maturity, Fair Value, Total | 479,662 | $ 485,650
Debt Securities |  |
Available for Sale, Amortized Cost |  |
Available for Sale, Amortized Cost, Due in one year or less | 3,229 |
Available for Sale, Amortized Cost, Due after one year to five years | 36,704 |
Available for Sale, Amortized Cost, Due after five to ten years | 105,842 |
Available for Sale, Amortized Cost, Due after ten years | 261,389 |
Available for sale Securities, Amortized Cost | 407,164 |
Available for Sale, Fair Value |  |
Available for Sale, Fair Value, Due in one year or less | 3,237 |
Available for Sale, Fair Value, Due after one year to five years | 37,152 |
Available for Sale, Fair Value, Due after five to ten years | 106,576 |
Available for Sale, Fair Value, Due after ten years | 262,049 |
Available for sale Securities, Fair Value, Total | 409,014 |
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 | 15,731 |
Held to Maturity, Amortized Cost, Due after five to ten years | 18,158 |
Held to Maturity, Amortized Cost, Due after ten years | 444,909 |
Held to maturity Securities, Amortized Cost | 478,798 |
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 | 15,917 |
Held to Maturity, Fair Value, Due after five to ten years | 18,654 |
Held to Maturity, Fair Value, Due after ten years | 445,091 |
Held to Maturity, Fair Value, Total | 479,662 |
Equity securities |  |
Available for Sale, Amortized Cost |  |
Available for Sale, Amortized Cost, Marketable equity securities | 19,176 |
Available for Sale, Fair Value |  |
Available for Sale, Fair Value, Marketable equity securities | 20,111 |
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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