Annual report pursuant to Section 13 and 15(d)

OTHER COMPREHENSIVE INCOME - Activity/Roll Forward (Details)

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OTHER COMPREHENSIVE INCOME - Activity/Roll Forward (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Pretax      
Noncredit-related impairment recoveries (losses) on debt securities not expected to be sold $ 4,000 $ 1,000 $ 20,000
Unrealized gains (losses) on derivatives used in cash flow hedging relationships arising during the period 3,000 2,000 13,000
Less: Reclassification adjustment for net (gains) losses included in net income 1,000 0 (1,000)
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships 4,000 2,000 12,000
Defined benefit pension items     (8,000)
Net change in pension and post-retirement obligations 0 (38,000) 8,000
Total other comprehensive income (loss), pretax (52,000) (269,000) (6,000)
Tax (Expense) Benefit      
Noncredit-related impairment recoveries (losses) on debt securities not expected to be sold (2,000) 0 (7,000)
Unrealized gains (losses) on derivatives used in cash flow hedging relationships arising during the period (1,000) (1,000) (4,000)
Less: Reclassification adjustment for net (gains) losses included in net income 0 0 0
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships (1,000) (1,000) (4,000)
Defined benefit pension items     (3,000)
Net change in pension and other post-retirement obligations 0 (13,000) 3,000
Total other comprehensive income (loss) 18,000 94,000 2,000
After-tax      
Noncredit-related impairment recoveries (losses) on debt securities not expected to be sold 2,000 1,000 13,000
Net change in unrealized holding gains (losses) on available-for-sale debt/equity securities (39,000) (202,000) (20,000)
Unrealized gains and losses on derivatives used in cash flow hedging relationships arising during the period 2,000 1,000 9,000
Less: Reclassification adjustment for net losses (gains) losses included in net income 1,000 0 (1,000)
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships 3,000 1,000 8,000
Defined benefit pension items     (5,000)
Net change in pension and post-retirement obligations 0 25,000 (5,000)
Other comprehensive loss, net of tax (34,000) (175,000) (4,000)
Equity Securities [Member]      
Pretax      
Net change in unrealized holding gains (losses) on available-for-sale debt/equity securities 1,000 0 0
Tax (Expense) Benefit      
Net change in unrealized holding gains (losses) on available-for-sale debt/equity securities (1,000) 0 0
After-tax      
Net change in unrealized holding gains (losses) on available-for-sale debt/equity securities 0 0 0
Debt securities      
Pretax      
Unrealized holding gains (losses) on available-for-sale debt securities arising during the period (87,000) (203,000) (26,000)
Less: Reclassification adjustment for net losses (gains) included in net income 26,000 (107,000) (4,000)
Net change in unrealized holding gains (losses) on available-for-sale debt/equity securities (57,000) (309,000) (10,000)
Tax (Expense) Benefit      
Unrealized holding gains (losses) on available-for-sale debt securities arising during the period 31,000 70,000 9,000
Less: Reclassification adjustment for net losses (gains) included in net income (9,000) 38,000 1,000
Net change in unrealized holding gains (losses) on available-for-sale debt/equity securities 20,000 108,000 3,000
After-tax      
Unrealized holding gains (losses) on available-for-sale debt securities arising during the period (56,000) (133,000) (17,000)
Less: Reclassification adjustment for net gains (losses) included in net income 17,000 (69,000) (3,000)
Net change in unrealized holding gains (losses) on available-for-sale debt/equity securities $ (37,000) $ (201,000) $ (7,000)