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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2021
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, 2019 |  | $ | 28,950 |  |  | $ | 639 |  |  | $ | (101,278 | ) |  | $ | 17,399 |  |  | $ | (434 | ) |  | $ | (54,724 | )
Net change in unrealized gain or loss |  |  | 176,009 |  |  |  | — |  |  |  | — |  |  |  | 46,180 |  |  |  | (4,935 | ) |  |  | 217,254 |
Reclassification of net income or loss realized and included in earnings |  |  | — |  |  |  | — |  |  |  | 4,656 |  |  |  | (11,249 | ) |  |  | — |  |  |  | (6,593 | )
Valuation adjustment to employee benefit plans |  |  | — |  |  |  | — |  |  |  | (10,251 | ) |  |  | — |  |  |  | — |  |  |  | (10,251 | )
Amortization of unrealized net gain or loss on securities transferred to HTM |  |  | — |  |  |  | (378 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (378 | )
Income tax expense (benefit) |  |  | 39,817 |  |  |  | (85 | ) |  |  | (1,265 | ) |  |  | 7,903 |  |  |  | — |  |  |  | 46,370 |
Balance, September 30, 2020 |  | $ | 165,142 |  |  | $ | 346 |  |  | $ | (105,608 | ) |  | $ | 44,427 |  |  | $ | (5,369 | ) |  | $ | 98,938 |
Balance, December 31, 2020 |  | $ | 171,224 |  |  | $ | 276 |  |  | $ | (125,573 | ) |  | $ | 39,511 |  |  | $ | (5,369 | ) |  | $ | 80,069 |
Net change in unrealized gain or loss |  |  | (144,715 | ) |  |  | — |  |  |  | — |  |  |  | 353 |  |  |  | 438 |  |  |  | (143,924 | )
Reclassification of net income or loss realized and included in earnings |  |  | 2,166 |  |  |  | — |  |  |  | 3,970 |  |  |  | (19,941 | ) |  |  | 4,468 |  |  |  | (9,337 | )
Valuation adjustments to pension plan attributable to VERIP and curtailment |  |  | — |  |  |  | — |  |  |  | 59,606 |  |  |  | — |  |  |  | — |  |  |  | 59,606 |
Other valuation adjustments to employee benefit plans |  |  | — |  |  |  | — |  |  |  | (10,651 | ) |  |  | — |  |  |  | — |  |  |  | (10,651 | )
Amortization of unrealized net gain or loss on securities transferred to HTM |  |  | — |  |  |  | (134 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (134 | )
Income tax expense (benefit) |  |  | (31,952 | ) |  |  | (30 | ) |  |  | 11,783 |  |  |  | (4,370 | ) |  |  | — |  |  |  | (24,569 | )
Balance, September 30, 2021 |  | $ | 60,627 |  |  | $ | 172 |  |  | $ | (84,431 | ) |  | $ | 24,293 |  |  | $ | (463 | ) |  | $ | 198 |
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.
﻿ |  | Nine Months Ended |  |  |
Amount reclassified from AOCI (a) |  | September 30, |  |  | Affected line item on
(in thousands) |  | 2021 |  |  | 2020 |  |  | the statement of income
Loss on sale of AFS securities |  | $ | (2,166 | ) |  | $ | — |  |  | Noninterest income
Tax effect |  |  | 487 |  |  |  | — |  |  | Income taxes
Net of tax |  |  | (1,679 | ) |  |  | — |  |  | Net income
Amortization of unrealized net gain on securities transferred to HTM |  |  | 134 |  |  |  | 378 |  |  | Interest income
Tax effect |  |  | (30 | ) |  |  | (85 | ) |  | Income taxes
Net of tax |  |  | 104 |  |  |  | 293 |  |  | Net income
Amortization of defined benefit pension and post-retirement items |  |  | (3,970 | ) |  |  | (4,656 | ) |  | Other noninterest expense (b)
Tax effect |  |  | 884 |  |  |  | 1,053 |  |  | Income taxes
Net of tax |  |  | (3,086 | ) |  |  | (3,603 | ) |  | Net income
Reclassification of unrealized gain on cash flow hedges |  |  | 18,771 |  |  |  | 12,602 |  |  | Interest income
Tax effect |  |  | (4,188 | ) |  |  | (2,851 | ) |  | Income taxes
Net of tax |  |  | 14,583 |  |  |  | 9,751 |  |  | Net income
Amortization of gain (loss) on terminated cash flow hedges |  |  | 1,170 |  |  |  | (1,353 | ) |  | Interest income
Tax effect |  |  | (261 | ) |  |  | 306 |  |  | Income taxes
Net of tax |  |  | 909 |  |  |  | (1,047 | ) |  | Net income
Reclassification of unrealized loss on equity method investment |  |  | (4,468 | ) |  |  | — |  |  | Noninterest income
Tax effect |  |  | — |  |  |  | — |  |  | Income taxes
Net of tax |  |  | (4,468 | ) |  |  | — |  |  | Net income
Total reclassifications, net of tax |  | $ | 6,363 |  |  | $ | 5,394 |  |  | 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 other noninterest expense (see Note 11 – Retirement Plans for additional details).

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