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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 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 |  |  | (71,759 | ) |  |  | — |  |  |  | — |  |  |  | (13,894 | ) |  |  | — |  |  |  | (85,653 | )
Reclassification of net loss realized and included in earnings |  |  | — |  |  |  | — |  |  |  | 2,448 |  |  |  | 1,565 |  |  |  | — |  |  |  | 4,013 |
Other Valuation adjustments for employee benefit plan |  |  | — |  |  |  | — |  |  |  | (9,039 | ) |  |  | — |  |  |  | — |  |  |  | (9,039 | )
Amortization of unrealized net loss on securities transferred to HTM |  |  | — |  |  |  | 1,680 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,680 |
Income tax expense (benefit) |  |  | (16,284 | ) |  |  | 380 |  |  |  | (1,494 | ) |  |  | (2,794 | ) |  |  | — |  |  |  | (20,192 | )
Balance, June 30, 2018 |  | $ | (84,987 | ) |  | $ | (13,285 | ) |  | $ | (84,175 | ) |  | $ | (20,762 | ) |  | $ | — |  |  | $ | (203,209 | )
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 |  |  | 96,514 |  |  |  | — |  |  |  | — |  |  |  | 29,343 |  |  |  | 611 |  |  |  | 126,468 |
Reclassification of net loss realized and included in earnings |  |  | — |  |  |  | — |  |  |  | 4,527 |  |  |  | 3,676 |  |  |  | — |  |  |  | 8,203 |
Amortization of unrealized net loss on securities transferred to HTM |  |  | — |  |  |  | 1,481 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,481 |
Income tax expense |  |  | 21,822 |  |  |  | 335 |  |  |  | 1,023 |  |  |  | 7,466 |  |  |  | — |  |  |  | 30,646 |
Balance, June 30, 2019 |  | $ | 24,567 |  |  | $ | (10,898 | ) |  | $ | (106,743 | ) |  | $ | 17,260 |  |  | $ | 611 |  |  | $ | (75,203 | )
Line Items in Consolidated Income Statements Affected by Amounts Reclassified from Accumulated Other Comprehensive Income |
﻿ |  | Six Months |  |  |
Amount reclassified from AOCI (a) |  | June 30, |  |  | Affected line item on
(in thousands) |  | 2019 |  |  | 2018 |  |  | the statement of income
Amortization of unrealized net loss on securities transferred to HTM |  | $ | (1,481 | ) |  | $ | (1,680 | ) |  | Interest income
Tax effect |  |  | 335 |  |  |  | 380 |  |  | Income taxes
Net of tax |  |  | (1,146 | ) |  |  | (1,300 | ) |  | Net income
Amortization of defined benefit pension and post-retirement items |  |  | (4,527 | ) |  |  | (2,448 | ) |  | Other noninterest expense (b)
Tax effect |  |  | 1,023 |  |  |  | 555 |  |  | Income taxes
Net of tax |  |  | (3,504 | ) |  |  | (1,893 | ) |  | Net income
Reclassification of unrealized gain (loss) on cash flow hedges |  |  | (1,204 | ) |  |  | 979 |  |  | Interest income
Tax effect |  |  | 272 |  |  |  | (222 | ) |  | Income taxes
Net of tax |  |  | (932 | ) |  |  | 757 |  |  | Net income
Amortization of loss on terminated cash flow hedges |  |  | (2,472 | ) |  |  | (2,544 | ) |  | Interest income
Tax effect |  |  | 559 |  |  |  | 577 |  |  | Income taxes
Net of tax |  |  | (1,913 | ) |  |  | (1,967 | ) |  | Net income
Total reclassifications, net of tax |  | $ | (7,495 | ) |  | $ | (4,403 | ) |  | 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=114867106&loc=SL7669686-108580 + Details
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