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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2020
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, 2020, 2019, and 2018 respectively, including changes during the years then ended as well as any reclassifications out of accumulated other comprehensive income (loss):
($ in Thousands)Investment
Securities
AFS		Defined Benefit
Pension and
Postretirement
Obligations		Accumulated
Other
Comprehensive
Income (Loss)
Balance, December 31, 2017$(38,453)$(24,305)$(62,758)
Other comprehensive income (loss) before reclassifications(39,891)(28,612)(68,503)
Amounts reclassified from accumulated other comprehensive income (loss)
Investment securities losses (gains), net1,985 — 1,985 
Personnel expense— (148)(148)
Other expense— 2,203 2,203 
Interest income(572)— (572)
Adjustment for adoption of ASU 2016-01(84)— (84)
Adjustment for adoption of ASU 2018-02(8,419)(5,235)(13,654)
Income tax (expense) benefit9,791 6,767 16,558 
Net other comprehensive income (loss) during period(37,189)(25,025)(62,214)
Balance, December 31, 2018$(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 income895 — 895 
Income tax (expense) benefit(26,898)(4,465)(31,363)
Net other comprehensive income (loss) during period79,631 12,158 91,789 
Balance, December 31, 2019$3,989 $(37,172)$(33,183)
Other comprehensive income (loss) before reclassifications$55,628 $7,780 $63,408 
Amounts reclassified from accumulated other comprehensive income (loss)
Investment securities losses (gains), net(9,222)— (9,222)
Personnel expense— (148)(148)
Other expense— 3,897 3,897 
Interest income3,359 — 3,359 
Income tax (expense) benefit(12,429)(3,064)(15,493)
Net other comprehensive income (loss) during period37,336 8,465 45,801 
Balance, December 31, 2020$41,325 $(28,707)$12,618