Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2019

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Summary of activity in accumulated other comprehensive income (loss)

The following table summarizes the components of accumulated other comprehensive income (loss) at December 31, 2019, 2018, and 2017 respectively, including changes during the years then ended as well as any reclassifications out of accumulated other comprehensive income (loss):

($ in Thousands)	Investment Securities Available For Sale		Defined Benefit Pension and Postretirement Obligations		Accumulated Other Comprehensive Income (Loss)
Balance, December 31, 2016	$	(20,079)	$	(34,600)	$	(54,679)
Other comprehensive income (loss) before reclassifications	(27,040)		14,273		(12,767)
Amounts reclassified from accumulated other comprehensive income (loss)
Personnel expense	—		(148)		(148)
Other expense	—		2,282		2,282
Interest income	(2,665)		—		(2,665)
Income tax (expense) benefit	11,331		(6,112)		5,219
Net other comprehensive income (loss) during period	(18,374)		10,295		(8,079)
Balance, December 31, 2017	$	(38,453)	$	(24,305)	$	(62,758)
Other comprehensive income (loss) before reclassifications	$	(39,891)	$	(28,612)	$	(68,503)
Amounts reclassified from accumulated other comprehensive income (loss)
Investment securities losses (gains), net	1,985		—		1,985
Personnel expense	—		(148)		(148)
Other expense	—		2,203		2,203
Interest income	(572)		—		(572)
Adjustment for adoption of ASU 2016-01	(84)		—		(84)
Adjustment for adoption of ASU 2018-02	(8,419)		(5,235)		(13,654)
Income tax (expense) benefit	9,791		6,767		16,558
Net other comprehensive income (loss) during period	(37,189)		(25,025)		(62,214)
Balance, December 31, 2018	$	(75,643)	$	(49,330)	$	(124,972)
Other comprehensive income (loss) before reclassifications	$	111,592	$	16,296	$	127,887
Amounts reclassified from accumulated other comprehensive income (loss)
Investment securities losses (gains), net	(5,957)		—		(5,957)
Personnel expense	—		(148)		(148)
Other expense	—		476		476
Interest income	895		—		895
Income tax (expense) benefit	(26,898)		(4,465)		(31,363)
Net other comprehensive income (loss) during period	79,631		12,158		91,789
Balance, December 31, 2019	$	3,989	$	(37,172)	$	(33,183)