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Stockholders' Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ (180,709) $ (134,402)
Net change in unrealized gain or loss $ 69,225 $ (23,409) 126,468 (85,653)
Reclassification of net loss realized and included in earnings 3,984 2,217 8,203 4,013
Other Valuation Adjustments for employee benefit plan   (9,039)   (9,039)
Amortization of unrealized net loss on securities transferred to HTM 890 925 1,481 1,680
Income tax expense (benefit) 16,793 (6,646) 30,646 (20,192)
Ending Balance (75,203) (203,209) (75,203) (203,209)
Equity Method Investment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net change in unrealized gain or loss     611  
Ending Balance 611   611  
Accumulated Other Comprehensive Loss Available for Sale Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (50,125) (29,512)
Net change in unrealized gain or loss     96,514 (71,759)
Income tax expense (benefit)     21,822 (16,284)
Ending Balance 24,567 (84,987) 24,567 (84,987)
Held to Maturity Securities Transferred from AFS [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (12,044) (14,585)
Amortization of unrealized net loss on securities transferred to HTM     1,481 1,680
Income tax expense (benefit)     335 380
Ending Balance (10,898) (13,285) (10,898) (13,285)
Employee Benefit Plans [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (110,247) (79,078)
Reclassification of net loss realized and included in earnings     4,527 2,448
Other Valuation Adjustments for employee benefit plan       (9,039)
Income tax expense (benefit)     1,023 (1,494)
Ending Balance (106,743) (84,175) (106,743) (84,175)
Gains and Losses on Cash Flow Hedges [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (8,293) (11,227)
Net change in unrealized gain or loss     29,343 (13,894)
Reclassification of net loss realized and included in earnings     3,676 1,565
Income tax expense (benefit)     7,466 (2,794)
Ending Balance $ 17,260 $ (20,762) $ 17,260 $ (20,762)