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Accumulated Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Other comprehensive income (loss), Pre-tax Amount |  | $ (17,075) | $ 16,713
Other comprehensive income (loss), Tax Effect |  | (4,375) | 4,282
Other comprehensive income (loss), before Reclassifications, Net-of-tax Amount |  | (12,837) | 12,327
Amounts reclassified from accumulated other comprehensive income (loss) |  | 137 | 104
Total other comprehensive (loss) income, net of tax |  | (12,700) | 12,431
Securities Available for Sale and Transferred Securities [Member] |  |  |
Other comprehensive income (loss), before Reclassifications, Pre-tax Amount |  | (19,362) | 16,451
Reclassification, Pre-tax Amount | [1] | (1) | (175)
Other comprehensive income (loss), Pre-tax Amount |  | (19,363) | 16,276
Other comprehensive income (loss), before Reclassifications, Tax Effect |  | (4,961) | 4,215
Reclassification, Tax Effect | [1] |  | (45)
Other comprehensive income (loss), Tax Effect |  | (4,961) | 4,170
Other comprehensive income (loss), before Reclassifications, Net-of-tax Amount |  | (14,401) | 12,236
Amounts reclassified from accumulated other comprehensive income (loss) | [1] | (1) | (130)
Total other comprehensive (loss) income, net of tax |  | (14,402) | 12,106
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member] |  |  |
Other comprehensive income (loss), Pre-tax Amount |  | 2,103 | 123
Other comprehensive income (loss), Tax Effect |  | 539 | 32
Total other comprehensive (loss) income, net of tax |  | 1,564 | 91
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Including Portion Attributable to Noncontrolling Interest [Member] |  |  |
Other comprehensive income (loss), Pre-tax Amount |  | (1) | (9)
Other comprehensive income (loss), Tax Effect |  |  | (2)
Total other comprehensive (loss) income, net of tax |  | (1) | (7)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] |  |  |
Other comprehensive income (loss), Pre-tax Amount |  | 186 | 323
Other comprehensive income (loss), Tax Effect |  | 47 | 82
Total other comprehensive (loss) income, net of tax |  | 139 | 241
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member] |  |  |
Other comprehensive income (loss), Pre-tax Amount |  | 185 | 314
Other comprehensive income (loss), Tax Effect |  | 47 | 80
Total other comprehensive (loss) income, net of tax |  | $ 138 | $ 234
[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 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 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=121641772&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 830 -SubTopic 30 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 2: 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 3: 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=121641772&loc=SL7669686-108580 Reference 4: 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=121640130&loc=d3e1436-108581 Reference 5: 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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