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Investment Securities, Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-Sale: |  |
Less than 12 Months, Fair Value | $ 219,551 | $ 234,467
Less than 12 Months, Unrealized Losses | 4,337 | 4,985
12 Months or More, Fair Value | 4,424 | 4,696
12 Months or More, Unrealized Losses | 139 | 147
Held-to-Maturity: |  |
Less than 12 Months, Fair Value | 22,183 | 28,459
Less than 12 Months, Unrealized Losses | 467 | 468
12 Months or More, Fair Value | 2,586 | 2,564
12 Months or More, Unrealized Losses | 79 | 101
U.S. Treasury notes [Member] |  |
Available-for-Sale: |  |
Less than 12 Months, Fair Value | 11,090 | 16,076
Less than 12 Months, Unrealized Losses | 33 | 76
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
U.S. Agency notes [Member] |  |
Available-for-Sale: |  |
Less than 12 Months, Fair Value | 77,741 | 69,784
Less than 12 Months, Unrealized Losses | 1,723 | 1,848
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
U.S. Agency mortgage-backed securities [Member] |  |
Available-for-Sale: |  |
Less than 12 Months, Fair Value | 62,000 | 64,564
Less than 12 Months, Unrealized Losses | 1,145 | 1,310
12 Months or More, Fair Value | 3,393 | 3,518
12 Months or More, Unrealized Losses | 128 | 134
Non-taxable Municipal securities [Member] |  |
Available-for-Sale: |  |
Less than 12 Months, Fair Value | 58,461 | 72,867
Less than 12 Months, Unrealized Losses | 1,334 | 1,621
12 Months or More, Fair Value | 301 | 451
12 Months or More, Unrealized Losses | 0 | 2
Held-to-Maturity: |  |
Less than 12 Months, Fair Value | 19,061 | 20,429
Less than 12 Months, Unrealized Losses | 289 | 251
12 Months or More, Fair Value | 2,586 | 2,564
12 Months or More, Unrealized Losses | 79 | 101
Taxable Municipal securities [Member] |  |
Available-for-Sale: |  |
Less than 12 Months, Fair Value | 8,957 | 9,721
Less than 12 Months, Unrealized Losses | 59 | 82
12 Months or More, Fair Value | 450 | 450
12 Months or More, Unrealized Losses | 3 | 3
Held-to-Maturity: |  |
Less than 12 Months, Fair Value | 3,122 | 8,030
Less than 12 Months, Unrealized Losses | 178 | 217
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
Mutual funds [Member] |  |
Available-for-Sale: |  |
Less than 12 Months, Fair Value | 1,211 | 1,205
Less than 12 Months, Unrealized Losses | 37 | 37
12 Months or More, Fair Value | 280 | 277
12 Months or More, Unrealized Losses | 8 | 8
Trust preferred securities [Member] |  |
Available-for-Sale: |  |
Less than 12 Months, Fair Value | 49 | 49
Less than 12 Months, Unrealized Losses | 0 | 1
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
Equity securities [Member] |  |
Available-for-Sale: |  |
Less than 12 Months, Fair Value | 42 | 201
Less than 12 Months, Unrealized Losses | 6 | 10
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | $ 0 | $ 0

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