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Securities (Schedule of Contractual Maturities of Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Available for Sale, Amortized Cost |  |
Available for sale Securities, Amortized Cost | $ 400,665 | $ 363,366
Available for Sale, Fair Value |  |
Available for sale Securities, Fair Value, Total | 401,837 | 363,644
Held to Maturity, Amortized Cost |  |
Held to maturity Securities, Amortized Cost | 502,123 | 487,076
Held to Maturity, Fair Value |  |
Held to Maturity, Fair Value, Total | 500,917 | $ 485,650
Debt Securities |  |
Available for Sale, Amortized Cost |  |
Available for Sale, Amortized Cost, Due in one year or less | 1,232 |
Available for Sale, Amortized Cost, Due after one year to five years | 38,912 |
Available for Sale, Amortized Cost, Due after five to ten years | 87,856 |
Available for Sale, Amortized Cost, Due after ten years | 253,499 |
Available for sale Securities, Amortized Cost | 381,499 |
Available for Sale, Fair Value |  |
Available for Sale, Fair Value, Due in one year or less | 1,239 |
Available for Sale, Fair Value, Due after one year to five years | 39,410 |
Available for Sale, Fair Value, Due after five to ten years | 88,207 |
Available for Sale, Fair Value, Due after ten years | 253,320 |
Available for sale Securities, Fair Value, Total | 382,176 |
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 | 15,915 |
Held to Maturity, Amortized Cost, Due after five to ten years | 21,090 |
Held to Maturity, Amortized Cost, Due after ten years | 465,118 |
Held to maturity Securities, Amortized Cost | 502,123 |
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 | 16,092 |
Held to Maturity, Fair Value, Due after five to ten years | 21,643 |
Held to Maturity, Fair Value, Due after ten years | 463,182 |
Held to Maturity, Fair Value, Total | 500,917 |
Equity securities |  |
Available for Sale, Amortized Cost |  |
Available for Sale, Amortized Cost, Marketable equity securities | 19,166 |
Available for Sale, Fair Value |  |
Available for Sale, Fair Value, Marketable equity securities | 19,661 |
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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