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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2019
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, 2017 |  | $ | (29,512 | ) |  | $ | (14,585 | ) |  | $ | (79,078 | ) |  | $ | (11,227 | ) |  | $ | — |  |  | $ | (134,402 | )
Other comprehensive income/loss before income taxes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change in unrealized loss |  |  | (92,477 | ) |  |  | — |  |  |  | — |  |  |  | (18,418 | ) |  |  | — |  |  |  | (110,895 | )
Reclassification of net loss realized and included in earnings |  |  | — |  |  |  | — |  |  |  | 3,719 |  |  |  | 2,841 |  |  |  | — |  |  |  | 6,560 |
Other Valuation adjustments for employee benefit plan |  |  | — |  |  |  | — |  |  |  | (9,039 | ) |  |  | — |  |  |  | — |  |  |  | (9,039 | )
Amortization of unrealized net loss on securities transferred to HTM |  |  | — |  |  |  | 2,427 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2,427 |
Income tax expense (benefit) |  |  | (20,985 | ) |  |  | 550 |  |  |  | (1,205 | ) |  |  | (3,530 | ) |  |  | — |  |  |  | (25,170 | )
Balance, September 30, 2018 |  | $ | (101,004 | ) |  | $ | (12,708 | ) |  | $ | (83,193 | ) |  | $ | (23,274 | ) |  | $ | — |  |  | $ | (220,179 | )
Balance, December 31, 2018 |  | $ | (50,125 | ) |  | $ | (12,044 | ) |  | $ | (110,247 | ) |  | $ | (8,293 | ) |  | $ | — |  |  | $ | (180,709 | )
Other comprehensive income (loss) before income taxes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change in unrealized gain or 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 employee benefit plan |  |  | — |  |  |  | — |  |  |  | (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 | )
Line Items in Consolidated Income Statements Affected by Amounts Reclassified from Accumulated Other Comprehensive Income |
﻿ |  | Nine Months |  |  |
Amount reclassified from AOCI (a) |  | September 30, |  |  | Affected line item on
(in thousands) |  | 2019 |  |  | 2018 |  |  | the statement of income
Amortization of unrealized net loss on securities transferred to HTM |  | $ | (2,435 | ) |  | $ | (2,427 | ) |  | Interest income
Tax effect |  |  | 551 |  |  |  | 550 |  |  | Income taxes
Net of tax |  |  | (1,884 | ) |  |  | (1,877 | ) |  | Net income
Amortization of defined benefit pension and post-retirement items |  |  | (6,851 | ) |  |  | (3,719 | ) |  | Other noninterest expense (b)
Tax effect |  |  | 1,546 |  |  |  | 842 |  |  | Income taxes
Net of tax |  |  | (5,305 | ) |  |  | (2,877 | ) |  | Net income
Reclassification of unrealized gain (loss) on cash flow hedges |  |  | (1,200 | ) |  |  | 1,264 |  |  | Interest income
Tax effect |  |  | 271 |  |  |  | (286 | ) |  | Income taxes
Net of tax |  |  | (929 | ) |  |  | 978 |  |  | Net income
Amortization of loss on terminated cash flow hedges |  |  | (3,432 | ) |  |  | (4,105 | ) |  | Interest income
Tax effect |  |  | 776 |  |  |  | 930 |  |  | Income taxes
Net of tax |  |  | (2,656 | ) |  |  | (3,175 | ) |  | Net income
Total reclassifications, net of tax |  | $ | (10,774 | ) |  | $ | (6,951 | ) |  | 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 12 – 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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