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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 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 |  |  | (55,114 | ) |  |  | — |  |  |  | — |  |  |  | (7,130 | ) |  |  | — |  |  |  | (62,244 | )
Reclassification of net loss realized and included in earnings |  |  | — |  |  |  | — |  |  |  | 1,177 |  |  |  | 619 |  |  |  | — |  |  |  | 1,796 |
Amortization of unrealized net loss on securities transferred to HTM |  |  | — |  |  |  | 755 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 755 |
Income tax expense (benefit) |  |  | (12,508 | ) |  |  | 171 |  |  |  | 267 |  |  |  | (1,476 | ) |  |  | — |  |  |  | (13,546 | )
Balance, March 31, 2018 |  | $ | (72,118 | ) |  | $ | (14,001 | ) |  | $ | (78,168 | ) |  | $ | (16,262 | ) |  | $ | — |  |  | $ | (180,549 | )
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 |  |  | 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 |  |  | 10,623 |  |  |  | 134 |  |  |  | 498 |  |  |  | 2,598 |  |  |  | — |  |  |  | 13,853 |
Balance, March 31, 2019 |  | $ | (13,764 | ) |  | $ | (11,587 | ) |  | $ | (108,542 | ) |  | $ | 600 |  |  | $ | 784 |  |  | $ | (132,509 | )
Line Items in Consolidated Income Statements Affected by Amounts Reclassified from Accumulated Other Comprehensive Income |
﻿ |  | Three Months Ended |  |  |
Amount reclassified from AOCI (a) |  | March 31, |  |  | Affected line item on
(in thousands) |  | 2019 |  |  | 2018 |  |  | the statement of income
Amortization of unrealized net loss on securities transferred to HTM |  | $ | (591 | ) |  | $ | (755 | ) |  | Interest income
Tax effect |  |  | 134 |  |  |  | 171 |  |  | Income taxes
Net of tax |  |  | (457 | ) |  |  | (584 | ) |  | Net income
Amortization of defined benefit pension and post-retirement items |  |  | (2,203 | ) |  |  | (1,177 | ) |  | Other noninterest expense (b)
Tax effect |  |  | 498 |  |  |  | 267 |  |  | Income taxes
Net of tax |  |  | (1,705 | ) |  |  | (910 | ) |  | Net income
Reclassification of unrealized gain (loss) on cash flow hedges |  |  | (610 | ) |  |  | 336 |  |  | Interest income
Tax effect |  |  | 138 |  |  |  | (76 | ) |  | Income taxes
Net of tax |  |  | (472 | ) |  |  | 260 |  |  | Net income
Amortization of loss on terminated cash flow hedges |  |  | (1,406 | ) |  |  | (954 | ) |  | Interest income
Tax effect |  |  | 318 |  |  |  | 216 |  |  | Income taxes
Net of tax |  |  | (1,088 | ) |  |  | (738 | ) |  | Net income
Total reclassifications, net of tax |  | $ | (3,722 | ) |  | $ | (1,972 | ) |  | 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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