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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 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 $ 37,451   $ 2,579   5,215 $ 8,057
Pension and other postretirement plans, OCI (loss) 2,660   1,231   5,320 2,463
OCI 40,111 (29,576) 3,810 $ 6,710 10,535 10,520
AOCI (loss), end of period (106,333)       (106,333)  
Investment securities:            
Accumulated other comprehensive income (loss), before tax            
AOCI (loss), beginning of period (27,761) 5,664 (2,235) (9,169) 5,664 (9,169)
OCI (loss) before reclassifications 40,364   4,420   4,671 13,194
Realized investment gains (355)   (1,239)   (970) (3,157)
Impairment losses 17   84   2,900 162
Investment securities, OCI (loss) 40,026   3,265   6,601 10,199
AOCI (loss), end of period 12,265 (27,761) 1,030 (2,235) 12,265 1,030
Accumulated other comprehensive income (loss), tax            
AOCI (loss), beginning of period 0 1,189 (470) (1,926) 1,189 (1,926)
OCI (loss) before reclassifications 2,646   928   981 2,771
Realized investment gains (75)   (260)   (204) (663)
Impairment losses 4   18   609 34
Investment securities, OCI (loss) 2,575   686   1,386 2,142
AOCI (loss), end of period 2,575 0 216 (470) 2,575 216
Accumulated other comprehensive income (loss), net of tax            
AOCI (loss), beginning of period (27,761) 4,475 (1,765) (7,243) 4,475 (7,243)
OCI (loss) before reclassifications 37,718   3,492   3,690 10,423
Realized investment gains (280)   (979)   (766) (2,494)
Impairment losses 13   66   2,291 128
Change in unrealized holding gains on available-for-sale securities 37,451   2,579   5,215 8,057
AOCI (loss), end of period 9,690 (27,761) 814 (1,765) 9,690 814
Pension and other postretirement plans:            
Accumulated other comprehensive income (loss), before tax            
AOCI (loss), beginning of period (150,233) (153,600) (154,190) (155,749) (153,600) (155,749)
Amortization of prior service costs 336   348   672 697
Amortization of net actuarial loss 3,031   1,210   6,062 2,420
Pension and other postretirement plans, OCI (loss) 3,367   1,558   6,734 3,117
AOCI (loss), end of period (146,866) (150,233) (152,632) (154,190) (146,866) (152,632)
Accumulated other comprehensive income (loss), tax            
AOCI (loss), beginning of period (31,550) (32,257) (32,381) (32,708) (32,257) (32,708)
Amortization of prior service costs 70   73   141 146
Amortization of net actuarial loss 637   254   1,273 508
Pension and other postretirement plans, OCI (loss) 707   327   1,414 654
AOCI (loss), end of period (30,843) (31,550) (32,054) (32,381) (30,843) (32,054)
Accumulated other comprehensive income (loss), net of tax            
AOCI (loss), beginning of period (118,683) (121,343) (121,809) (123,041) (121,343) (123,041)
Amortization of prior service costs 266   275   531 551
Amortization of net actuarial loss 2,394   956   4,789 1,912
Pension and other postretirement plans, OCI (loss) 2,660   1,231   5,320 2,463
AOCI (loss), end of period (116,023) (118,683) (120,578) (121,809) (116,023) (120,578)
Total            
Accumulated other comprehensive income (loss), before tax            
AOCI (loss), beginning of period (177,994) (147,936) (156,425) (164,918) (147,936) (164,918)
Investment securities, OCI (loss) 40,026   3,265   6,601 10,199
Pension and other postretirement plans, OCI (loss) 3,367   1,558   6,734 3,117
OCI 43,393   4,823   13,335 13,316
AOCI (loss), end of period (134,601) (177,994) (151,602) (156,425) (134,601) (151,602)
Accumulated other comprehensive income (loss), tax            
AOCI (loss), beginning of period (31,550) (31,068) (32,851) (34,634) (31,068) (34,634)
Investment securities, OCI (loss) 2,575   686   1,386 2,142
Pension and other postretirement plans, OCI (loss) 707   327   1,414 654
OCI 3,282   1,013   2,800 2,796
AOCI (loss), end of period (28,268) (31,550) (31,838) (32,851) (28,268) (31,838)
Accumulated other comprehensive income (loss), net of tax            
AOCI (loss), beginning of period (146,444) (116,868) (123,574) (130,284) (116,868) (130,284)
Change in unrealized holding gains on available-for-sale securities 37,451   2,579   5,215 8,057
Pension and other postretirement plans, OCI (loss) 2,660   1,231   5,320 2,463
OCI 40,111 (29,576) 3,810 6,710 10,535 10,520
AOCI (loss), end of period $ (106,333) $ (146,444) $ (119,764) $ (123,574) $ (106,333) $ (119,764)