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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2016
Stockholders' Equity [Abstract] |
Components of Accumulated Other Comprehensive Income (Loss) |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿(in thousands) |  | Available for Sale Securities |  | HTM Securities Transferred from AFS |  | Employee Benefit Plans |  | Cash Flow Hedges |  | Total
﻿Balance, December 31, 2013 |  | $ | 8,263 |  | $ | (21,189) |  | $ | (22,453) |  | $ | — |  | $ | (35,379)
﻿Net change in unrealized gain (loss) |  |  | 15,413 |  |  | — |  |  | — |  |  | (592) |  |  | 14,821
﻿Reclassification of net loss realized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿and included in earnings |  |  | — |  |  | — |  |  | 390 |  |  | — |  |  | 390
﻿Valuation adjustment for employee benefit plans |  |  | — |  |  | — |  |  | (41,244) |  |  | — |  |  | (41,244)
﻿Amortization of unrealized net loss on securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ transferred to held to maturity |  |  | — |  |  | 3,297 |  |  | — |  |  | — |  |  | 3,297
﻿Income tax expense (benefit) |  |  | 5,675 |  |  | 1,182 |  |  | (14,681) |  |  | (217) |  |  | (8,041)
﻿Balance, December 31, 2014 |  | $ | 18,001 |  | $ | (19,074) |  | $ | (48,626) |  | $ | (375) |  | $ | (50,074)
﻿Net change in unrealized (loss) gain |  |  | (21,581) |  |  | — |  |  | — |  |  | 311 |  |  | (21,270)
﻿Reclassification of net (gain) loss realized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿and included in earnings |  |  | (165) |  |  | — |  |  | 3,175 |  |  | — |  |  | 3,010
﻿Valuation adjustment for employee benefit plans |  |  | — |  |  | — |  |  | (33,971) |  |  | — |  |  | (33,971)
﻿Amortization of unrealized net loss on securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ transferred to held to maturity |  |  | — |  |  | 3,530 |  |  | — |  |  | — |  |  | 3,530
﻿Income tax (benefit) expense |  |  | (8,013) |  |  | 1,251 |  |  | (11,532) |  |  | 114 |  |  | (18,180)
﻿Balance, December 31, 2015 |  | $ | 4,268 |  | $ | (16,795) |  | $ | (67,890) |  | $ | (178) |  | $ | (80,595)
﻿Net change in unrealized loss |  |  | (49,839) |  |  | — |  |  | — |  |  | (7,507) |  |  | (57,346)
﻿Reclassification of net (gain) loss realized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿and included in earnings |  |  | (1,912) |  |  | — |  |  | 5,928 |  |  | — |  |  | 4,016
﻿Valuation adjustment for employee benefit plans |  |  | — |  |  | — |  |  | (12,748) |  |  | — |  |  | (12,748)
﻿Amortization of unrealized net loss on securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ transferred to held to maturity |  |  | — |  |  | 3,830 |  |  | — |  |  | — |  |  | 3,830
﻿Income tax (benefit) expense |  |  | (18,804) |  |  | 1,427 |  |  | (2,209) |  |  | (2,725) |  |  | (22,311)
﻿Balance, December 31, 2016 |  | $ | (28,679) |  | $ | (14,392) |  | $ | (72,501) |  | $ | (4,960) |  | $ | (120,532)
﻿
Line Items in Consolidated Income Statements Affected by Amounts Reclassified from Accumulated Other Comprehensive Income |
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |
﻿Amount reclassified from AOCI (a) |  | Year Ended December 31, |  | Increase (decrease) in affected line
﻿(in thousands) |  | 2016 |  | 2015 |  | item in the income statement
﻿Gain on sale of AFS securities |  | $ | 1,912 |  | $ | 165 |  | Securities gains
﻿Tax effect |  |  | (694) |  |  | (58) |  | Income taxes
﻿Net of tax |  |  | 1,218 |  |  | 107 |  | Net income
﻿Amortization of unrealized net loss on |  |  |  |  |  |  |  |
﻿securities transferred to HTM |  | $ | (3,830) |  | $ | (3,530) |  | Interest income
﻿Tax effect |  |  | 1,427 |  |  | 1,236 |  | Income taxes
﻿Net of tax |  |  | (2,403) |  |  | (2,294) |  | Net income
﻿Amortization of defined benefit pension and |  |  |  |  |  |  |  |
﻿post-retirement items (b) |  | $ | (5,928) |  | $ | (3,175) |  | Employee benefits expense
﻿Tax effect |  |  | 1,920 |  |  | 1,111 |  | Income taxes
﻿Net of tax |  |  | (4,008) |  |  | (2,064) |  | Net income
﻿Total reclassifications, net of tax |  | $ | (5,193) |  | $ | (4,251) |  | Net income
﻿
| (a) |  | Amounts in parenthesis 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 footnote 15 for additional details).
﻿
Compliance with Regulatory Capital Requirements |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Actual |  | Required for Minimum Capital Adequacy |  | Required To Be Well Capitalized
﻿($ in thousands) |  | Amount |  | Ratio % |  | Amount |  | Ratio % |  | Amount |  | Ratio %
﻿At December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Tier 1 leverage capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Company |  | $ | 2,184,812 |  | 9.56 |  | $ | 914,520 |  | 4.00 |  | $ | 1,143,150 |  | 5.00
﻿Whitney Bank |  |  | 2,011,719 |  | 8.83 |  |  | 911,091 |  | 4.00 |  |  | 1,138,864 |  | 5.00
﻿Common equity tier 1 (to risk weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Company |  | $ | 2,184,812 |  | 11.26 |  | $ | 873,192 |  | 4.50 |  | $ | 1,261,277 |  | 6.50
﻿Whitney Bank |  |  | 2,011,719 |  | 10.39 |  |  | 871,361 |  | 4.50 |  |  | 1,258,633 |  | 6.50
﻿Tier 1 capital (to risk weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Company |  | $ | 2,184,812 |  | 11.26 |  | $ | 1,164,256 |  | 6.00 |  | $ | 1,552,341 |  | 8.00
﻿Whitney Bank |  |  | 2,011,719 |  | 10.39 |  |  | 1,161,815 |  | 6.00 |  |  | 1,549,086 |  | 8.00
﻿Total capital (to risk weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Company |  | $ | 2,564,230 |  | 13.21 |  | $ | 1,552,341 |  | 8.00 |  | $ | 1,940,427 |  | 10.00
﻿Whitney Bank |  |  | 2,241,137 |  | 11.57 |  |  | 1,549,086 |  | 8.00 |  |  | 1,936,358 |  | 10.00
﻿At December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Tier 1 leverage capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Company |  | $ | 1,844,992 |  | 8.55 |  | $ | 863,289 |  | 4.00 |  | $ | 1,079,111 |  | 5.00
﻿Whitney Bank |  |  | 1,965,332 |  | 9.16 |  |  | 858,551 |  | 4.00 |  |  | 1,073,189 |  | 5.00
﻿Common equity tier 1 (to risk weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Company |  | $ | 1,844,992 |  | 9.96 |  | $ | 833,216 |  | 4.50 |  | $ | 1,203,534 |  | 6.50
﻿Whitney Bank |  |  | 1,965,332 |  | 10.64 |  |  | 830,985 |  | 4.50 |  |  | 1,200,312 |  | 6.50
﻿Tier 1 capital (to risk weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Company |  | $ | 1,844,992 |  | 9.96 |  | $ | 1,110,954 |  | 6.00 |  | $ | 1,481,272 |  | 8.00
﻿Whitney Bank |  |  | 1,965,332 |  | 10.64 |  |  | 1,107,980 |  | 6.00 |  |  | 1,477,306 |  | 8.00
﻿Total capital (to risk weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Company |  | $ | 2,195,913 |  | 11.86 |  | $ | 1,481,272 |  | 8.00 |  | $ | 1,851,590 |  | 10.00
﻿Whitney Bank |  |  | 2,166,253 |  | 11.73 |  |  | 1,477,306 |  | 8.00 |  |  | 1,846,633 |  | 10.00
﻿

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