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Other Comprehensive Income (Loss) (Details 1) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balances at Beginning |  |  |  | $ 549,405 | $ 516,466
Net current-period other comprehensive income |  | $ 2,060 | $ 5,074 | 3,485 | 17,734
Balances at Ending |  | 576,915 | 554,435 | 576,915 | 554,435
Available-for-Sale Securities |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balances at Beginning |  | (6,718) | 9,692 | (7,915) | (2,744)
Other comprehensive income before reclassifications |  | 1,831 | 5,018 | 3,028 | 17,593
Amounts reclassified from accumulated other comprehensive (loss) income |  | 0 | (144) | 0 | (283)
Net current-period other comprehensive income |  | 1,831 | 4,874 | 3,028 | 17,310
Balances at Ending |  | (4,887) | 14,566 | (4,887) | 14,566
Employee Benefit Plans |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balances at Beginning |  | (28,966) | (28,033) | (29,194) | (28,257)
Other comprehensive income before reclassifications |  | 0 | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive (loss) income | [1] | 229 | 200 | 457 | 424
Net current-period other comprehensive income |  | 229 | 200 | 457 | 424
Balances at Ending |  | (28,737) | (27,833) | (28,737) | (27,833)
Accumulated Other Comprehensive (Loss) Income |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balances at Beginning |  | (35,684) | (18,341) | (37,109) | (31,001)
Other comprehensive income before reclassifications |  | 1,831 | 5,018 | 3,028 | 17,593
Amounts reclassified from accumulated other comprehensive (loss) income |  | 229 | 56 | 457 | 141
Net current-period other comprehensive income |  | 2,060 | 5,074 | 3,485 | 17,734
Balances at Ending |  | $ (33,624) | $ (13,267) | $ (33,624) | $ (13,267)
[1] | Amounts in parentheses indicated debits in income statement.

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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