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Other Comprehensive Income (Loss)
 6 Months Ended
Jun. 30, 2020
Equity [Abstract]  
Comprehensive Income (Loss) Note Other Comprehensive Income (Loss)
The before and after tax amounts allocated to each component of other comprehensive income (loss) are presented in the following table. Reclassification adjustments related to securities available for sale are included in net gain (loss) on securities transactions in the accompanying consolidated statements of income. Reclassification adjustments related to defined-benefit post-retirement benefit plans are included in the computation of net periodic pension expense (see Note 12 – Defined Benefit Plans).
Three Months Ended
June 30, 2020		Three Months Ended
June 30, 2019
Before Tax
Amount		Tax  Expense,
(Benefit)		Net of  Tax
Amount		Before Tax
Amount		Tax  Expense,
(Benefit)		Net of  Tax
Amount
Securities available for sale and transferred securities:
Change in net unrealized gain/loss during the period
$156,509  $32,868  $123,641  $158,140  $33,209  $124,931  
Change in net unrealized gain on securities transferred to held to maturity
(308) (65) (243) (308) (65) (243) 
Reclassification adjustment for net (gains) losses included in net income
—  —  —  (169) (35) (134) 
Total securities available for sale and transferred securities
156,201  32,803  123,398  157,663  33,109  124,554  
Defined-benefit post-retirement benefit plans:
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit)
1,329  278  1,051  1,406  296  1,110  
Total defined-benefit post-retirement benefit plans
1,329  278  1,051  1,406  296  1,110  
Total other comprehensive income (loss)$157,530  $33,081  $124,449  $159,069  $33,405  $125,664  
Six Months Ended
June 30, 2020		Six Months Ended
June 30, 2019
Before Tax
Amount		Tax  Expense,
(Benefit)		Net of  Tax
Amount		Before Tax
Amount		Tax  Expense,
(Benefit)		Net of  Tax
Amount
Securities available for sale and transferred securities:
Change in net unrealized gain/loss during the period
$386,627  $81,193  $305,434  $356,286  $74,820  $281,466  
Change in net unrealized gain on securities transferred to held to maturity
(685) (144) (541) (652) (137) (515) 
Reclassification adjustment for net (gains) losses included in net income
(108,989) (22,888) (86,101) (169) (35) (134) 
Total securities available for sale and transferred securities
276,953  58,161  218,792  355,465  74,648  280,817  
Defined-benefit post-retirement benefit plans:
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit)
2,659  557  2,102  2,812  591  2,221  
Total defined-benefit post-retirement benefit plans
2,659  557  2,102  2,812  591  2,221  
Total other comprehensive income (loss)$279,612  $58,718  $220,894  $358,277  $75,239  $283,038  
Activity in accumulated other comprehensive income (loss), net of tax, was as follows:
Securities
Available
For Sale		Defined
Benefit
Plans		Accumulated
Other
Comprehensive
Income
Balance January 1, 2020$313,304  $(45,934) $267,370  
Other comprehensive income (loss) before reclassifications
304,893  —  304,893  
Reclassification of amounts included in net income
(86,101) 2,102  (83,999) 
Net other comprehensive income (loss) during period218,792  2,102  220,894  
Balance at June 30, 2020$532,096  $(43,832) $488,264  
Balance January 1, 2019$(16,103) $(47,497) $(63,600) 
Other comprehensive income (loss) before reclassifications
280,951  —  280,951  
Reclassification of amounts included in net income
(134) 2,221  2,087  
Net other comprehensive income (loss) during period280,817  2,221  283,038  
Balance at June 30, 2019$264,714  $(45,276) $219,438