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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Accumulated other comprehensive income (loss), net of tax    
AOCI (loss), beginning of period $ (116,868)  
Investment securities, OCI (loss) (32,236) $ 5,478
Pension and other postretirement plans, OCI (loss) 2,660 1,232
OCI (loss) (29,576) 6,710
AOCI (loss), end of period (146,444)  
Investment securities:    
Accumulated other comprehensive income (loss), before tax    
AOCI (loss), beginning of period 5,664 (9,169)
OCI (loss) before reclassifications (35,693) 8,774
Realized investment gains (615) (1,918)
Impairment losses 2,883 78
Investment securities, OCI (loss) (33,425) 6,934
AOCI (loss), end of period (27,761) (2,235)
Accumulated other comprehensive income (loss), tax    
AOCI (loss), beginning of period 1,189 (1,926)
OCI (loss) before reclassifications (1,665) 1,843
Realized investment gains (129) (403)
Impairment losses 605 16
Investment securities, OCI (loss) (1,189) 1,456
AOCI (loss), end of period 0 (470)
Accumulated other comprehensive income (loss), net of tax    
AOCI (loss), beginning of period 4,475 (7,243)
OCI (loss) before reclassifications (34,028) 6,931
Realized investment gains (486) (1,515)
Impairment losses 2,278 62
Investment securities, OCI (loss) (32,236) 5,478
AOCI (loss), end of period (27,761) (1,765)
Pension and other postretirement plans:    
Accumulated other comprehensive income (loss), before tax    
AOCI (loss), beginning of period (153,600) (155,749)
Amortization of prior service costs 336 349
Amortization of net actuarial loss 3,031 1,210
Pension and other postretirement plans, OCI (loss) 3,367 1,559
AOCI (loss), end of period (150,233) (154,190)
Accumulated other comprehensive income (loss), tax    
AOCI (loss), beginning of period (32,257) (32,708)
Amortization of prior service costs 71 73
Amortization of net actuarial loss 636 254
Pension and other postretirement plans, OCI (loss) 707 327
AOCI (loss), end of period (31,550) (32,381)
Accumulated other comprehensive income (loss), net of tax    
AOCI (loss), beginning of period (121,343) (123,041)
Amortization of prior service costs 265 276
Amortization of net actuarial loss 2,395 956
Pension and other postretirement plans, OCI (loss) 2,660 1,232
AOCI (loss), end of period (118,683) (121,809)
Total    
Accumulated other comprehensive income (loss), before tax    
AOCI (loss), beginning of period (147,936) (164,918)
Investment securities, OCI (loss) (33,425) 6,934
Pension and other postretirement plans, OCI (loss) 3,367 1,559
OCI (loss) (30,058) 8,493
AOCI (loss), end of period (177,994) (156,425)
Accumulated other comprehensive income (loss), tax    
AOCI (loss), beginning of period (31,068) (34,634)
Investment securities, OCI (loss) (1,189) 1,456
Pension and other postretirement plans, OCI (loss) 707 327
OCI (loss) (482) 1,783
AOCI (loss), end of period (31,550) (32,851)
Accumulated other comprehensive income (loss), net of tax    
AOCI (loss), beginning of period (116,868) (130,284)
Investment securities, OCI (loss) (32,236) 5,478
Pension and other postretirement plans, OCI (loss) 2,660 1,232
OCI (loss) (29,576) 6,710
AOCI (loss), end of period $ (146,444) $ (123,574)