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Accumulated Other Comprehensive Income (Loss) - Summary of Changes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance | $ 1,303,463 | $ 901,657 | $ 850,509
Other comprehensive income before reclassifications | (14,870) | 12,340 |
Amounts reclassified from accumulated other comprehensive income | (3,018) | (1,667) | (2,422)
Period change | (17,888) | 10,673 | (12,219)
Reclassification adjustment under ASU 2018-02 | 0 |  |
Ending balance | 1,408,260 | 1,303,463 | 901,657
Total |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance | (2,908) | (13,581) | (1,362)
Period change | (17,888) | 10,673 | (12,219)
Reclassification adjustment under ASU 2018-02 | (626) |  |
Ending balance | (21,422) | (2,908) | (13,581)
Unrealized Gains (Losses) on Securities Available for Sale |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance | 8,970 | 1,035 |
Other comprehensive income before reclassifications | (13,872) | 9,645 |
Amounts reclassified from accumulated other comprehensive income | (3,373) | (1,710) | (2,203)
Period change | (17,245) | 7,935 |
Reclassification adjustment under ASU 2018-02 | 1,932 |  |
Ending balance | (6,343) | 8,970 | 1,035
Unrealized Gains (Losses) on Cash Flow Hedges |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance | (1,125) | (1,774) |
Other comprehensive income before reclassifications | 437 | 9 |
Amounts reclassified from accumulated other comprehensive income | 371 | 640 | 813
Period change | 808 | 649 |
Reclassification adjustment under ASU 2018-02 | (242) |  |
Ending balance | (559) | (1,125) | (1,774)
Unrealized Gains (Losses) on Defined Benefit Plans |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance | (10,753) | (12,842) |
Other comprehensive income before reclassifications | (1,435) | 2,686 |
Amounts reclassified from accumulated other comprehensive income | (16) | (597) |
Period change | (1,451) | 2,089 |
Reclassification adjustment under ASU 2018-02 | (2,316) |  |
Ending balance | $ (14,520) | $ (10,753) | $ (12,842)

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109228884&loc=d3e1436-108581 + Details
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