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Accumulated Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Other comprehensive income (loss), Pre-tax Amount |  | $ 8,312 |  |  | $ 385 |  |  | $ (19,151) | $ 19,231
Other comprehensive income (loss), Tax Effect |  | 2,130 |  |  | 98 |  |  | (4,907) | 4,927
Other comprehensive income (loss), before Reclassifications, Net-of-tax Amount |  | 6,351 |  |  | 401 |  |  | (14,735) | 14,506
Amounts reclassified from accumulated other comprehensive income (loss) |  | 169 |  |  | (114) |  |  | 491 | (202)
Other comprehensive income (loss), net of tax |  | (6,182) | $ 4,638 | $ (12,700) | 287 | $ 1,586 | $ 12,431 | (14,244) | 14,304
Securities Available for Sale and Transferred Securities [Member] |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), before Reclassifications, Pre-tax Amount |  | 8,647 |  |  | 374 |  |  | (21,348) | 19,737
Reclassification, Pre-tax Amount | [1] | 42 |  |  | (467) |  |  | 105 | (1,213)
Other comprehensive income (loss), Pre-tax Amount |  | 8,605 |  |  | (93) |  |  | (21,243) | 18,524
Other comprehensive income (loss), before Reclassifications, Tax Effect |  | 2,216 |  |  | 96 |  |  | (5,470) | 5,057
Reclassification, Tax Effect | [1] | 11 |  |  | (120) |  |  | 27 | (311)
Other comprehensive income (loss), Tax Effect |  | 2,205 |  |  | (24) |  |  | (5,443) | 4,746
Other comprehensive income (loss), before Reclassifications, Net-of-tax Amount |  | 6,431 |  |  | 278 |  |  | (15,878) | 14,680
Amounts reclassified from accumulated other comprehensive income (loss) | [1] | 31 |  |  | (347) |  |  | 78 | (902)
Other comprehensive income (loss), net of tax |  | 6,400 |  |  | (69) |  |  | (15,800) | 13,778
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), Pre-tax Amount |  | (108) |  |  | 165 |  |  | 1,537 | (234)
Other comprehensive income (loss), Tax Effect |  | (28) |  |  | 42 |  |  | 394 | (60)
Other comprehensive income (loss), net of tax |  | (80) |  |  | 123 |  |  | 1,143 | (174)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), Pre-tax Amount |  | (1) |  |  | (8) |  |  | (2) | (26)
Other comprehensive income (loss), Tax Effect |  | (1) |  |  | (2) |  |  | (1) | (7)
Other comprehensive income (loss), net of tax |  | 0 |  |  | (6) |  |  | (1) | (19)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), Pre-tax Amount |  | 186 |  |  | 321 |  |  | 557 | 967
Other comprehensive income (loss), Tax Effect |  | 48 |  |  | 82 |  |  | 143 | 248
Other comprehensive income (loss), net of tax |  | 138 |  |  | 239 |  |  | 414 | 719
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), Pre-tax Amount |  | 185 |  |  | 313 |  |  | 555 | 941
Other comprehensive income (loss), Tax Effect |  | 47 |  |  | 80 |  |  | 142 | 241
Other comprehensive income (loss), net of tax |  | $ 138 |  |  | $ 233 |  |  | $ 413 | $ 700
[1] | Includes amounts related to the amortization/accretion of unrealized net gains and losses related to the Company’s reclassification of available for sale investment securities to the held to maturity category. The unrealized net gains/losses will be amortized/accreted over the remaining life of the investment securities as an adjustment of yield.

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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124431353&loc=SL124442411-227067 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=124431353&loc=SL124442407-227067 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 6: 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=124509347&loc=SL7669686-108580 + Details
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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124431353&loc=SL124442411-227067 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 4: 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=124509347&loc=SL7669686-108580 Reference 5: 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=124507222&loc=d3e1436-108581 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=124431353&loc=SL124442407-227067 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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