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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2020
Stockholders Equity Note [Abstract] |
Components of Accumulated Other Comprehensive Income (Loss) |
﻿ |  | Available for Sale Securities |  |  | HTM Securities Transferred from AFS |  |  | Employee Benefit Plans |  |  | Cash Flow Hedges |  |  | Equity Method Investment |  |  | Total |
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, December 31, 2018 |  | $ | (50,125 | ) |  | $ | (12,044 | ) |  | $ | (110,247 | ) |  | $ | (8,293 | ) |  | $ | — |  |  | $ | (180,709 | )
Net change in unrealized gain or loss |  |  | 46,984 |  |  |  | — |  |  |  | — |  |  |  | 9,475 |  |  |  | 784 |  |  |  | 57,243 |
Reclassification of net loss realized and included in earnings |  |  | — |  |  |  | — |  |  |  | 2,203 |  |  |  | 2,016 |  |  |  | — |  |  |  | 4,219 |
Amortization of unrealized net loss on securities transferred to HTM |  |  | — |  |  |  | 591 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 591 |
Income tax expense (benefit) |  |  | 10,623 |  |  |  | 134 |  |  |  | 498 |  |  |  | 2,598 |  |  |  | — |  |  |  | 13,853 |
Balance, March 31, 2019 |  | $ | (13,764 | ) |  | $ | (11,587 | ) |  | $ | (108,542 | ) |  | $ | 600 |  |  | $ | 784 |  |  | $ | (132,509 | )
Balance, December 31, 2019 |  | $ | 28,950 |  |  | $ | 639 |  |  | $ | (101,278 | ) |  | $ | 17,399 |  |  | $ | (434 | ) |  | $ | (54,724 | )
Net change in unrealized gain or loss |  |  | 124,018 |  |  |  | — |  |  |  | — |  |  |  | 41,476 |  |  |  | (197 | ) |  |  | 165,297 |
Reclassification of net income or loss realized and included in earnings |  |  | — |  |  |  | — |  |  |  | 1,232 |  |  |  | (864 | ) |  |  | — |  |  |  | 368 |
Amortization of unrealized net gain on securities transferred to HTM |  |  | — |  |  |  | (195 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (195 | )
Income tax expense (benefit) |  |  | 28,056 |  |  |  | (44 | ) |  |  | 279 |  |  |  | 9,189 |  |  |  | — |  |  |  | 37,480 |
Balance, March 31, 2020 |  | $ | 124,912 |  |  | $ | 488 |  |  | $ | (100,325 | ) |  | $ | 48,822 |  |  | $ | (631 | ) |  | $ | 73,266 |
Line Items in Consolidated Income Statements Affected by Amounts Reclassified from Accumulated Other Comprehensive Income | The following table shows the line items of the consolidated statements of income affected by amounts reclassified from AOCI.
﻿ |  | Three Months Ended |  |  |
Amount reclassified from AOCI (a) |  | March 31, |  |  | Affected line item on
(in thousands) |  | 2020 |  |  | 2019 |  |  | the statement of income
Amortization of unrealized net loss or gain on securities transferred to HTM |  | $ | 195 |  |  | $ | (591 | ) |  | Interest income
Tax effect |  |  | (44 | ) |  |  | 134 |  |  | Income taxes
Net of tax |  |  | 151 |  |  |  | (457 | ) |  | Net income
Amortization of defined benefit pension and post-retirement items |  |  | (1,232 | ) |  |  | (2,203 | ) |  | Other noninterest expense (b)
Tax effect |  |  | 279 |  |  |  | 498 |  |  | Income taxes
Net of tax |  |  | (953 | ) |  |  | (1,705 | ) |  | Net income
Reclassification of unrealized gain (loss) on cash flow hedges |  |  | 1,569 |  |  |  | (610 | ) |  | Interest income
Tax effect |  |  | (355 | ) |  |  | 138 |  |  | Income taxes
Net of tax |  |  | 1,214 |  |  |  | (472 | ) |  | Net income
Amortization of loss on terminated cash flow hedges |  |  | (705 | ) |  |  | (1,406 | ) |  | Interest income
Tax effect |  |  | 159 |  |  |  | 318 |  |  | Income taxes
Net of tax |  |  | (546 | ) |  |  | (1,088 | ) |  | Net income
Total reclassifications, net of tax |  | $ | (134 | ) |  | $ | (3,722 | ) |  | Net income
(a) | Amounts in parentheses indicate reduction in net income.
(b) | These AOCI components are included in the computation of net periodic pension and post-retirement cost that is reported with employee benefits expense (see Note 11 – Retirement Plans for additional details).

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- Definition Tabular disclosure of the components of accumulated 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=118930883&loc=SL7669686-108580 + Details
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