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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accumulated other comprehensive income (loss), net of tax    
AOCI (loss), beginning of period $ (78,143)  
Change in unrealized holding losses on available-for-sale securities (8,752) $ (32,236)
Pension and other postretirement plans, OCI (loss) 3,463 2,660
Total other comprehensive loss, net of tax (5,289) (29,576)
AOCI (loss), end of period (83,432)  
Investment securities:    
Accumulated other comprehensive income (loss), before tax    
AOCI (loss), beginning of period 29,384 5,664
OCI (loss) before reclassifications (9,508) (35,693)
Realized investment gains (1,483) (615)
Impairment (recoveries) losses (87) 2,883
Investment securities, OCI (loss) (11,078) (33,425)
AOCI (loss), end of period 18,306 (27,761)
Accumulated other comprehensive income (loss), tax    
AOCI (loss), beginning of period 6,171 1,189
OCI (loss) before reclassifications (1) (1,997) (1,665)
Realized investment gains (311) (129)
Impairment (recoveries) losses (18) 605
Investment securities, OCI (loss) (2,326) (1,189)
AOCI (loss), end of period 3,845 0
Accumulated other comprehensive income (loss), net of tax    
AOCI (loss), beginning of period 23,213 4,475
OCI (loss) before reclassifications (1) (7,511) (34,028)
Realized investment gains (1,172) (486)
Impairment (recoveries) losses (69) 2,278
Change in unrealized holding losses on available-for-sale securities (8,752) (32,236)
AOCI (loss), end of period 14,461 (27,761)
Pension and other postretirement plans:    
Accumulated other comprehensive income (loss), before tax    
AOCI (loss), beginning of period (128,300) (153,600)
Amortization of prior service costs 357 336
Amortization of net actuarial loss 4,026 3,031
Pension and other postretirement plans, OCI (loss) 4,383 3,367
AOCI (loss), end of period (123,917) (150,233)
Accumulated other comprehensive income (loss), tax    
AOCI (loss), beginning of period (26,944) (32,257)
Amortization of prior service costs 75 71
Amortization of net actuarial loss 845 636
Pension and other postretirement plans, OCI (loss) 920 707
AOCI (loss), end of period (26,024) (31,550)
Accumulated other comprehensive income (loss), net of tax    
AOCI (loss), beginning of period (101,356) (121,343)
Amortization of prior service costs 282 265
Amortization of net actuarial loss 3,181 2,395
Pension and other postretirement plans, OCI (loss) 3,463 2,660
AOCI (loss), end of period (97,893) (118,683)
Total    
Accumulated other comprehensive income (loss), before tax    
AOCI (loss), beginning of period (98,916) (147,936)
Investment securities, OCI (loss) (11,078) (33,425)
Pension and other postretirement plans, OCI (loss) 4,383 3,367
OCI (loss) (6,695) (30,058)
AOCI (loss), end of period (105,611) (177,994)
Accumulated other comprehensive income (loss), tax    
AOCI (loss), beginning of period (20,773) (31,068)
Investment securities, OCI (loss) (2,326) (1,189)
Pension and other postretirement plans, OCI (loss) 920 707
OCI (loss) (1,406) (482)
AOCI (loss), end of period (22,179) (31,550)
Accumulated other comprehensive income (loss), net of tax    
AOCI (loss), beginning of period (78,143) (116,868)
Change in unrealized holding losses on available-for-sale securities (8,752) (32,236)
Pension and other postretirement plans, OCI (loss) 3,463 2,660
Total other comprehensive loss, net of tax (5,289) (29,576)
AOCI (loss), end of period $ (83,432) $ (146,444)