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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015
--- | --- | --- | ---
Securities available for sale: |  |  |
Amortized Cost | $ 247,489 | $ 166,778 |
Fair Value | 247,140 | 165,614 | $ 172,319
Unrealized Gains | 849 | 413 |
Unrealized (Losses) | (1,198) | (1,577) |
Securities held to maturity: |  |  |
Amortized Cost | 148,485 | 154,610 | 170,804
Fair Value | 151,684 | 157,146 | $ 174,756
Unrealized Gains | 3,360 | 3,284 |
Unrealized (Losses) | (161) | (748) |
Government-sponsored enterprises securities [Member] |  |  |
Securities available for sale: |  |  |
Amortized Cost | 38,638 | 19,000 |
Fair Value | 38,636 | 18,972 |
Unrealized Gains | 4 | 1 |
Unrealized (Losses) | (6) | (29) |
Mortgage-backed securities [Member] |  |  |
Securities available for sale: |  |  |
Amortized Cost | 174,905 | 122,474 |
Fair Value | 174,579 | 121,553 |
Unrealized Gains | 666 | 348 |
Unrealized (Losses) | (992) | (1,269) |
Securities held to maturity: |  |  |
Amortized Cost | 98,102 | 102,509 |
Fair Value | 98,030 | $ 101,767 |
Unrealized Gains | 87 |  |
Unrealized (Losses) | (159) | $ (742) |
Corporate bonds [Member] |  |  |
Securities available for sale: |  |  |
Amortized Cost | 33,863 | 25,216 |
Fair Value | 33,798 | $ 24,946 |
Unrealized Gains | 126 |  |
Unrealized (Losses) | (191) | $ (270) |
Equity securities [Member] |  |  |
Securities available for sale: |  |  |
Amortized Cost | 83 | 88 |
Fair Value | 127 | 143 |
Unrealized Gains | 53 | 64 |
Unrealized (Losses) | (9) | (9) |
States and local governments [Member] |  |  |
Securities held to maturity: |  |  |
Amortized Cost | 50,383 | 52,101 |
Fair Value | 53,654 | 55,379 |
Unrealized Gains | 3,273 | 3,284 |
Unrealized (Losses) | $ (2) | $ (6) |

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