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Investment Securities, Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-Sale: |  |
Amortized Cost | $ 329,895 | $ 324,662
Unrealized Gains | 1,257 | 1,129
Unrealized Losses | 4,476 | 5,132
Fair Value | 326,676 | 320,659
Held-to-Maturity: |  |
Amortized Cost | 38,455 | 41,003
Unrealized Gains | 103 | 56
Unrealized Losses | 546 | 569
Fair Value | 38,012 | 40,490
U.S. Treasury notes [Member] |  |
Available-for-Sale: |  |
Amortized Cost | 33,236 | 28,180
Unrealized Gains | 102 | 41
Unrealized Losses | 33 | 76
Fair Value | 33,305 | 28,145
U.S. Agency notes [Member] |  |
Available-for-Sale: |  |
Amortized Cost | 91,911 | 87,098
Unrealized Gains | 137 | 150
Unrealized Losses | 1,723 | 1,848
Fair Value | 90,325 | 85,400
U.S. Agency mortgage-backed securities [Member] |  |
Available-for-Sale: |  |
Amortized Cost | 69,162 | 72,402
Unrealized Gains | 79 | 89
Unrealized Losses | 1,273 | 1,444
Fair Value | 67,968 | 71,047
Held-to-Maturity: |  |
Amortized Cost | 0 |
Fair Value | 0 |
Non-taxable Municipal securities [Member] |  |
Available-for-Sale: |  |
Amortized Cost | 113,180 | 114,064
Unrealized Gains | 640 | 574
Unrealized Losses | 1,334 | 1,623
Fair Value | 112,486 | 113,015
Held-to-Maturity: |  |
Amortized Cost | 33,279 | 31,015
Unrealized Gains | 103 | 56
Unrealized Losses | 368 | 352
Fair Value | 33,014 | 30,719
Taxable Municipal securities [Member] |  |
Available-for-Sale: |  |
Amortized Cost | 19,189 | 19,710
Unrealized Gains | 224 | 220
Unrealized Losses | 62 | 85
Fair Value | 19,351 | 19,845
Held-to-Maturity: |  |
Amortized Cost | 5,176 | 9,988
Unrealized Gains | 0 | 0
Unrealized Losses | 178 | 217
Fair Value | 4,998 | 9,771
Mutual funds [Member] |  |
Available-for-Sale: |  |
Amortized Cost | 2,536 | 2,527
Unrealized Gains | 0 | 0
Unrealized Losses | 45 | 45
Fair Value | 2,491 | 2,482
Held-to-Maturity: |  |
Amortized Cost | 0 |
Fair Value | 0 |
Trust preferred securities [Member] |  |
Available-for-Sale: |  |
Amortized Cost | 49 | 49
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 1
Fair Value | 49 | 48
Held-to-Maturity: |  |
Amortized Cost | 0 |
Fair Value | 0 |
Equity securities [Member] |  |
Available-for-Sale: |  |
Amortized Cost | 632 | 632
Unrealized Gains | 75 | 55
Unrealized Losses | 6 | 10
Fair Value | 701 | $ 677
Held-to-Maturity: |  |
Amortized Cost | 0 |
Fair Value | $ 0 |

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