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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 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 loss |  |  | 125,589 |  |  |  | — |  |  |  | — |  |  |  | 35,472 |  |  |  | (434 | ) |  |  | 160,627 |
Reclassification of net loss realized and included in earnings |  |  | — |  |  |  | — |  |  |  | 6,851 |  |  |  | 4,632 |  |  |  | — |  |  |  | 11,483 |
Valuation adjustment to employee benefit plans |  |  | — |  |  |  | — |  |  |  | (7,015 | ) |  |  | — |  |  |  | — |  |  |  | (7,015 | )
Amortization of unrealized net loss on securities transferred to HTM |  |  | — |  |  |  | 2,435 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2,435 |
Income tax expense (benefit) |  |  | 28,395 |  |  |  | 551 |  |  |  | (37 | ) |  |  | 9,068 |  |  |  | — |  |  |  | 37,977 |
Balance, September 30, 2019 |  | $ | 47,069 |  |  | $ | (10,160 | ) |  | $ | (110,374 | ) |  | $ | 22,743 |  |  | $ | (434 | ) |  | $ | (51,156 | )
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 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 |
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) |  | 2020 |  |  | 2019 |  |  | the statement of income
Amortization of unrealized net gain or loss or gain on securities transferred to HTM |  | $ | 378 |  |  | $ | (2,435 | ) |  | Interest income
Tax effect |  |  | (85 | ) |  |  | 551 |  |  | Income taxes
Net of tax |  |  | 293 |  |  |  | (1,884 | ) |  | Net income
Amortization of defined benefit pension and post-retirement items |  |  | (4,656 | ) |  |  | (6,851 | ) |  | Other noninterest expense (b)
Tax effect |  |  | 1,053 |  |  |  | 1,546 |  |  | Income taxes
Net of tax |  |  | (3,603 | ) |  |  | (5,305 | ) |  | Net income
Reclassification of unrealized gain (loss) on cash flow hedges |  |  | 12,602 |  |  |  | (1,200 | ) |  | Interest income
Tax effect |  |  | (2,851 | ) |  |  | 271 |  |  | Income taxes
Net of tax |  |  | 9,751 |  |  |  | (929 | ) |  | Net income
Amortization of loss on terminated cash flow hedges |  |  | (1,353 | ) |  |  | (3,432 | ) |  | Interest income
Tax effect |  |  | 306 |  |  |  | 776 |  |  | Income taxes
Net of tax |  |  | (1,047 | ) |  |  | (2,656 | ) |  | Net income
Total reclassifications, net of tax |  | $ | 5,394 |  |  | $ | (10,774 | ) |  | 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 12 – Retirement Plans for additional details).

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