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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Accumulated other comprehensive income (loss), net of tax                
AOCI (loss), beginning of period     $ (116,868)       $ (116,868)  
Change in unrealized holding gains on available-for-sale securities $ 6,143     $ 2,330     11,358 $ 10,387
Pension and other postretirement plans, OCI (loss) 2,659     1,231     7,979 3,694
OCI 8,802 $ 40,111 (29,576) 3,561 $ 3,810 $ 6,710 19,337 14,081
AOCI (loss), end of period (97,531)           (97,531)  
Investment securities:                
Accumulated other comprehensive income (loss), before tax                
AOCI (loss), beginning of period 12,265   5,664 1,030   (9,169) 5,664 (9,169)
OCI before reclassifications 7,792     3,991     12,463 17,185
Realized investment gains (137)     (1,072)     (1,107) (4,229)
Impairment losses 122     31     3,022 193
Investment securities, OCI (loss) 7,777     2,950     14,378 13,149
AOCI (loss), end of period 20,042 12,265   3,980 1,030   20,042 3,980
Accumulated other comprehensive income (loss), tax                
AOCI (loss), beginning of period 2,575   1,189 216   (1,926) 1,189 (1,926)
OCI (loss) before reclassifications 1,636     838     2,617 3,609
Realized investment gains (28)     (225)     (232) (888)
Impairment losses 26     7     635 41
Investment securities, OCI (loss) 1,634     620     3,020 2,762
AOCI (loss), end of period 4,209 2,575   836 216   4,209 836
Accumulated other comprehensive income (loss), net of tax                
AOCI (loss), beginning of period 9,690   4,475 814   (7,243) 4,475 (7,243)
OCI (loss) before reclassifications 6,156     3,153     9,846 13,576
Realized investment gains (109)     (847)     (875) (3,341)
Impairment losses 96     24     2,387 152
Change in unrealized holding gains on available-for-sale securities 6,143     2,330     11,358 10,387
AOCI (loss), end of period 15,833 9,690   3,144 814   15,833 3,144
Pension and other postretirement plans:                
Accumulated other comprehensive income (loss), before tax                
AOCI (loss), beginning of period (146,866)   (153,600) (152,632)   (155,749) (153,600) (155,749)
Amortization of prior service costs 335     349     1,007 1,046
Amortization of net actuarial loss 3,031     1,210     9,093 3,630
Pension and other postretirement plans, OCI (loss) 3,366     1,559     10,100 4,676
AOCI (loss), end of period (143,500) (146,866)   (151,073) (152,632)   (143,500) (151,073)
Accumulated other comprehensive income (loss), tax                
AOCI (loss), beginning of period (30,843)   (32,257) (32,054)   (32,708) (32,257) (32,708)
Amortization of prior service costs 70     74     211 220
Amortization of net actuarial loss 637     254     1,910 762
Pension and other postretirement plans, OCI (loss) 707     328     2,121 982
AOCI (loss), end of period (30,136) (30,843)   (31,726) (32,054)   (30,136) (31,726)
Accumulated other comprehensive income (loss), net of tax                
AOCI (loss), beginning of period (116,023)   (121,343) (120,578)   (123,041) (121,343) (123,041)
Amortization of prior service costs 265     275     796 826
Amortization of net actuarial loss 2,394     956     7,183 2,868
Pension and other postretirement plans, OCI (loss) 2,659     1,231     7,979 3,694
AOCI (loss), end of period (113,364) (116,023)   (119,347) (120,578)   (113,364) (119,347)
Total                
Accumulated other comprehensive income (loss), before tax                
AOCI (loss), beginning of period (134,601)   (147,936) (151,602)   (164,918) (147,936) (164,918)
Investment securities, OCI (loss) 7,777     2,950     14,378 13,149
Pension and other postretirement plans, OCI (loss) 3,366     1,559     10,100 4,676
OCI 11,143     4,509     24,478 17,825
AOCI (loss), end of period (123,458) (134,601)   (147,093) (151,602)   (123,458) (147,093)
Accumulated other comprehensive income (loss), tax                
AOCI (loss), beginning of period (28,268)   (31,068) (31,838)   (34,634) (31,068) (34,634)
Investment securities, OCI (loss) 1,634     620     3,020 2,762
Pension and other postretirement plans, OCI (loss) 707     328     2,121 982
OCI 2,341     948     5,141 3,744
AOCI (loss), end of period (25,927) (28,268)   (30,890) (31,838)   (25,927) (30,890)
Accumulated other comprehensive income (loss), net of tax                
AOCI (loss), beginning of period (106,333)   (116,868) (119,764)   (130,284) (116,868) (130,284)
Change in unrealized holding gains on available-for-sale securities 6,143     2,330     11,358 10,387
Pension and other postretirement plans, OCI (loss) 2,659     1,231     7,979 3,694
OCI 8,802 40,111 $ (29,576) 3,561 3,810 $ 6,710 19,337 14,081
AOCI (loss), end of period $ (97,531) $ (106,333)   $ (116,203) $ (119,764)   $ (97,531) $ (116,203)