Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Accumulated other comprehensive income (loss), net of tax
AOCI (loss), beginning of period	$ (13,400)
Investment securities, OCI (loss)	(754)	$ 10,494
Pension and other postretirement plans, OCI (loss)	(1,076)	(2,742)
OCI (loss)	(1,830)	7,752
AOCI (loss), end of period	(15,230)
Total
Accumulated other comprehensive income (loss), before tax
AOCI (loss), beginning of period	(16,963)	(9,385)
Investment securities, OCI (loss)	(954)	13,284
Pension and other postretirement plans, OCI (loss)	(1,362)	(3,471)
OCI (loss)	(2,316)	9,813
AOCI (loss), end of period	(19,279)	428
Accumulated other comprehensive income (loss), tax
AOCI (loss), beginning of period	(3,563)	(1,971)
Investment securities, OCI (loss)	(200)	2,790
Pension and other postretirement plans, OCI (loss)	286	729
OCI (loss)	(486)	2,061
AOCI (loss), end of period	(4,049)	90
Accumulated other comprehensive income (loss), net of tax
AOCI (loss), beginning of period	(13,400)	(7,414)
Investment securities, OCI (loss)	(754)	10,494
Pension and other postretirement plans, OCI (loss)	(1,076)	(2,742)
OCI (loss)	(1,830)	7,752
AOCI (loss), end of period	(15,230)	338
Investment securities:
Accumulated other comprehensive income (loss), before tax
AOCI (loss), beginning of period	(31,402)	(66,571)
OCI (loss) before reclassifications	(1,554)	10,032
Realized investment losses	262	1,619
Impairment losses	338	1,633
Investment securities, OCI (loss)	(954)	13,284
AOCI (loss), end of period	(32,356)	(53,287)
Accumulated other comprehensive income (loss), tax
AOCI (loss), beginning of period	(6,595)	(13,980)
OCI (loss) before reclassifications	(326)	2,107
Realized investment losses	55	340
Impairment losses	71	343
Investment securities, OCI (loss)	(200)	2,790
AOCI (loss), end of period	(6,795)	(11,190)
Accumulated other comprehensive income (loss), net of tax
AOCI (loss), beginning of period	(24,807)	(52,591)
OCI (loss) before reclassifications	(1,228)	7,925
Realized investment losses	207	1,279
Impairment losses	267	1,290
Investment securities, OCI (loss)	(754)	10,494
AOCI (loss), end of period	(25,561)	(42,097)
Pension and other postretirement plans:
Accumulated other comprehensive income (loss), before tax
AOCI (loss), beginning of period	14,439	57,186
Amortization of prior service costs	389	362
Amortization of net actuarial gain	(1,751)	(3,833)
Pension and other postretirement plans, OCI (loss)	(1,362)	(3,471)
AOCI (loss), end of period	13,077	53,715
Accumulated other comprehensive income (loss), tax
AOCI (loss), beginning of period	3,032	12,009
Amortization of prior service costs	82	76
Amortization of net actuarial gain	(368)	(805)
Pension and other postretirement plans, OCI (loss)	(286)	(729)
AOCI (loss), end of period	2,746	11,280
Accumulated other comprehensive income (loss), net of tax
AOCI (loss), beginning of period	11,407	45,177
Amortization of prior service costs	307	286
Amortization of net actuarial gain	(1,383)	(3,028)
Pension and other postretirement plans, OCI (loss)	(1,076)	(2,742)
AOCI (loss), end of period	$ 10,331	$ 42,435

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