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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 2020
AOCI Attributable to Parent [Abstract]  
Schedule of Accumulated Other Comprehensive Loss [Table Text Block]

Table 12.1 - Accumulated Other Comprehensive Loss
(dollars in thousands)
 
 
Net Unrealized Loss on Available-for-sale Securities
 
Noncredit Portion of Other-than-temporary Impairment Losses on Held-to-maturity Securities
 
Net Unrealized Loss Relating to Hedging Activities
 
Pension and Postretirement Benefits
 
Total
Balance, December 31, 2018
 
$
(152,958
)
 
$
(129,154
)
 
$
(29,119
)
 
$
(5,276
)
 
$
(316,507
)
Cumulative effect of change in accounting principle
 
—

 
—

 
(175
)
 
—

 
(175
)
Other comprehensive income (loss) before reclassifications:
 
 
 
 
 
 
 
 
 
 
Net unrealized gains (losses)
 
34,065

 
—

 
(3,379
)
 
—

 
30,686

Noncredit other-than-temporary impairment losses
 
—

 
(80
)
 
—

 
—

 
(80
)
Accretion of noncredit loss
 
—

 
6,291

 
—

 
—

 
6,291

Reclassifications from other comprehensive income to net income
 
 
 
 
 
 
 
 
 
 
Noncredit other-than-temporary impairment losses reclassified to credit loss (1)
 
—

 
30

 
—

 
—

 
30

Amortization - hedging activities (2)
 
—

 
—

 
786

 
—

 
786

Amortization - pension and postretirement benefits (3)
 
—

 
—

 
—

 
161

 
161

Other comprehensive income (loss)
 
34,065

 
6,241

 
(2,593
)
 
161

 
37,874

Balance, March 31, 2019
 
$
(118,893
)
 
$
(122,913
)
 
$
(31,887
)
 
$
(5,115
)
 
$
(278,808
)
 
 
 
 
 
 
 
 
 
 
 
Balance, December 31, 2019
 
$
(73,922
)
 
$
(76,036
)
 
$
(30,207
)
 
$
(6,807
)
 
$
(186,972
)
Other comprehensive (loss) income before reclassifications:
 
 
 
 
 
 
 
 
 
 
Net unrealized losses
 
(85,737
)
 
—

 
(1,125
)
 
—

 
(86,862
)
Noncredit losses included in basis of securities sold
 
—

 
20,239

 
—

 
—

 
20,239

Accretion of noncredit loss
 
—

 
2,805

 
—

 
—

 
2,805

Net actuarial loss
 
—

 
—

 
—

 
501

 
501

Reclassifications from other comprehensive income to net income
 
 
 
 
 
 
 
 
 
 
Amortization - hedging activities (2)
 
—

 
—

 
1,757

 
—

 
1,757

Amortization - pension and postretirement benefits (3)
 
—

 
—

 
—

 
295

 
295

Other comprehensive (loss) income
 
(85,737
)
 
23,044

 
632

 
796

 
(61,265
)
Balance, March 31, 2020
 
$
(159,659
)
 
$
(52,992
)
 
$
(29,575
)
 
$
(6,011
)
 
$
(248,237
)
_______________________
(1)
Recorded in other income (loss) in the statement of operations.
(2)
Recorded in CO bond interest expense.
(3)
Recorded in other expenses in the statement of operations.