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Other Comprehensive Income (Loss) - Activity in AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balances at Beginning | $ 576,202 | $ 549,405 |
Net current-period other comprehensive income | (14,386) | 1,425 |
Balances at Ending | 579,411 | 563,518 |
Available-for-Sale Securities |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balances at Beginning | (13,005) | (7,915) |
Other comprehensive loss before reclassifications | (14,610) | 1,197 |
Amounts reclassified from accumulated other comprehensive (loss) income | (94) | 0 |
Net current-period other comprehensive income | (14,704) | 1,197 |
Adoption of ASU 2016-01 |  |  | $ 65
Balances at Ending | (27,644) | (6,718) |
Employee Benefit Plans |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balances at Beginning | (38,291) | (29,194) |
Other comprehensive loss before reclassifications | 0 | 0 |
Amounts reclassified from accumulated other comprehensive (loss) income | 318 | 228 |
Net current-period other comprehensive income | 318 | 228 |
Balances at Ending | (37,973) | (28,966) |
Accumulated Other Comprehensive (Loss) Income |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balances at Beginning | (51,296) | (37,109) |
Other comprehensive loss before reclassifications | (14,610) | 1,197 |
Amounts reclassified from accumulated other comprehensive (loss) income | 224 | 228 |
Net current-period other comprehensive income | (14,386) | 1,425 |
Adoption of ASU 2016-01 |  |  | $ 65
Balances at Ending | $ (65,617) | $ (35,684) |

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