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Accumulated Other Comprehensive Income (Loss) (Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | $ 852,401 | $ 764,230
Other comprehensive income (loss) before reclassifications | 18,143 | 15,212
Amounts reclassified from accumulated other comprehensive income | (5,787) | 383
Net current-period other comprehensive income (loss) | 12,356 | 15,595
Ending balance | 880,818 | 834,982
Unrealized Gain (Loss) on Securities Available for Sale |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 7,504 | (9,494)
Other comprehensive income (loss) before reclassifications | 18,143 | 15,212
Amounts reclassified from accumulated other comprehensive income | (6,180) | (75)
Net current-period other comprehensive income (loss) | 11,963 | 15,137
Ending balance | 19,467 | 5,643
Postretirement Plans Asset (Liability) |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (2,381) | (2,467)
Other comprehensive income (loss) before reclassifications | 0 | 0
Amounts reclassified from accumulated other comprehensive income | 393 | 458
Net current-period other comprehensive income (loss) | 393 | 458
Ending balance | (1,988) | (2,009)
Total |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 5,123 | (11,961)
Ending balance | $ 17,479 | $ 3,634

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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