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Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2021
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Schedule of Components of Comprehensive Income-Gross and Net of Tax
Third Quarter 2021   
($ in thousands)GrossTaxNet
Net income$92,636 18,931 73,705 
Components of OCI:   
Unrealized losses on investment securities:
   
Unrealized holding losses during the period(35,285)(7,410)(27,875)
Unrealized losses on securities with credit loss recognized in earnings(2,343)(492)(1,851)
Amounts reclassified into net income:
HTM securities1 — 1 
Net realized gains on disposals and losses on intent-to-sell AFS securities(1,296)(272)(1,024)
Credit loss expense1,334 280 1,054 
    Total unrealized losses on investment securities(37,589)(7,894)(29,695)
Defined benefit pension and post-retirement plans:   
Amounts reclassified into net income:   
Net actuarial loss693 145 548 
    Total defined benefit pension and post-retirement plans693 145 548 
Other comprehensive loss(36,896)(7,749)(29,147)
Comprehensive income$55,740 11,182 44,558 
Third Quarter 2020   
($ in thousands)GrossTaxNet
Net income$85,257 15,382 69,875 
Components of OCI:   
Unrealized gains on investment securities:
   
Unrealized holding gains during the period37,836 7,947 29,889 
Unrealized gains on securities with credit loss recognized in earnings9,239 1,940 7,299 
Amounts reclassified into net income:
HTM securities(1)(1)— 
Net realized gains on disposals and losses on intent-to-sell AFS securities(515)(109)(406)
Credit loss benefit(2,853)(599)(2,254)
    Total unrealized gains on investment securities43,706 9,178 34,528 
Defined benefit pension and post-retirement plans:   
Amounts reclassified into net income:   
Net actuarial loss754 158 596 
    Total defined benefit pension and post-retirement plans754 158 596 
Other comprehensive income44,460 9,336 35,124 
Comprehensive income$129,717 24,718 104,999 
Nine Months 2021   
($ in thousands)GrossTaxNet
Net income$381,466 76,608 304,858 
Components of OCI:  
Unrealized losses on investment securities:
  
Unrealized holding losses during the period(103,040)(21,638)(81,402)
Unrealized losses on securities with credit loss recognized in earnings(3,678)(772)(2,906)
Amounts reclassified into net income:
HTM securities(4)(1)(3)
Net realized gains on disposals and losses on intent-to-sell AFS securities(634)(133)(501)
Credit loss expense4,059 852 3,207 
    Total unrealized losses on investment securities(103,297)(21,692)(81,605)
Defined benefit pension and post-retirement plans:   
Amounts reclassified into net income:   
Net actuarial loss2,079 436 1,643 
    Total defined benefit pension and post-retirement plans2,079 436 1,643 
Other comprehensive loss(101,218)(21,256)(79,962)
Comprehensive income$280,248 55,352 224,896 
Nine Months 2020   
($ in thousands)GrossTaxNet
Net income$143,947 24,653 119,294 
Components of OCI:   
Unrealized gains on investment securities:
   
Unrealized holding gains during the period132,623 27,852 104,771 
Unrealized losses on securities with credit loss recognized in earnings(18,672)(3,921)(14,751)
Amounts reclassified into net income:
HTM securities(7)(2)(5)
Net realized losses on disposals and losses on intent-to-sell AFS securities9,126 1,916 7,210 
Credit loss expense8,010 1,682 6,328 
    Total unrealized gains on investment securities131,080 27,527 103,553 
Defined benefit pension and post-retirement plans:   
Amounts reclassified into net income:   
Net actuarial loss2,261 474 1,787 
    Total defined benefit pension and post-retirement plans2,261 474 1,787 
Other comprehensive income133,341 28,001 105,340 
Comprehensive income$277,288 52,654 224,634 
Schedule of Components of Accumulated Other Comprehensive Income Net of Tax
September 30, 2021Defined Benefit
Pension and Post-Retirement Plans		 
Net Unrealized (Losses) Gains on Investment SecuritiesTotal AOCI
($ in thousands)
Credit Loss Related1
HTM
Related		All
Other		Investments
Subtotal
Balance, December 31, 2020$(2,546)6 307,790 305,250 (85,064)220,186 
OCI before reclassifications(2,906)— (81,402)(84,308)— (84,308)
Amounts reclassified from AOCI3,207 (3)(501)2,703 1,643 4,346 
Net current period OCI301 (3)(81,903)(81,605)1,643 (79,962)
Balance, September 30, 2021$(2,245)3 225,887 223,645 (83,421)140,224 
Schedule of Reclassifications Out Of Accumulated Other Comprehensive Income
Quarter ended September 30,Nine Months ended September 30,Affected Line Item in the Unaudited Consolidated Statements of Income
($ in thousands)2021202020212020
HTM related
Unrealized (gains) losses on HTM disposals$(1)4 $(1)5 Net realized and unrealized investment gains (losses)
Amortization of net unrealized losses (gains) on HTM securities2 (5)(3)(12)Net investment income earned
1 (1)(4)(7)Income before federal income tax
— 1 1 2 Total federal income tax expense
1 — (3)(5)Net income
Net realized (gains) losses on disposals and intent-to-sell AFS securities
Net realized (gains) losses on disposals and intent-to-sell AFS securities(1,296)(515)(634)9,126 Net realized and unrealized investment gains (losses)
(1,296)(515)(634)9,126 Income before federal income tax
272 109 133 (1,916)Total federal income tax expense
(1,024)(406)(501)7,210 Net income
Credit loss related
Credit loss expense (benefit)1,334 (2,853)4,059 8,010 Net realized and unrealized investment gains (losses)
1,334 (2,853)4,059 8,010 Income before federal income tax
(280)599 (852)(1,682)Total federal income tax expense
1,054 (2,254)3,207 6,328 Net income
Defined benefit pension and post-retirement life plans
Net actuarial loss 159 162 478 486 Loss and loss expense incurred
534 592 1,601 1,775 Other insurance expenses
Total defined benefit pension and post-retirement life693 754 2,079 2,261 Income before federal income tax
(145)(158)(436)(474)Total federal income tax expense
548 596 1,643 1,787 Net income
Total reclassifications for the period$579 (2,064)$4,346 15,320 Net income