Unpaid Losses and Loss Adjustment Expenses - Loss Development (Details) $ in Thousands	Dec. 31, 2024 USD ($) Claim	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Claims Development [Line Items]
Incurred	$ 612,771
Total IBNR	$ 44,776
Cumulative number of reported claims | Claim	54,995
Cumulative Paid	$ 505,822
Net Unpaid losses and ALAE, years 2015 through 2024	106,949
Unpaid losses and ALAE, prior to 2015	1,020
Unpaid Losses, LPT	(10,646)
Unpaid losses and ALAE, net of reinsurance	97,323
Commercial Lines
Claims Development [Line Items]
Incurred	503,791
Total IBNR	43,395
Cumulative Paid	401,354
Net Unpaid losses and ALAE, years 2015 through 2024	102,437
Unpaid losses and ALAE, prior to 2015	1,020
Unpaid Losses, LPT	(10,646)
Unpaid losses and ALAE, net of reinsurance	92,811
Personal Lines
Claims Development [Line Items]
Incurred	108,980
Total IBNR	1,381
Cumulative Paid	104,468
Net Unpaid losses and ALAE, years 2015 through 2024	4,512
Unpaid losses and ALAE, prior to 2015	0
Unpaid losses and ALAE, net of reinsurance	4,512
Accident Year 2015
Claims Development [Line Items]
Incurred	54,785	$ 54,767	$ 54,541	$ 54,251	$ 53,222	$ 51,736	$ 49,763	$ 46,582	$ 40,078	$ 33,319
Total IBNR	$ 0
Cumulative number of reported claims | Claim	5,493
Cumulative Paid	$ 54,606	54,568	54,129	52,979	51,123	49,747	45,634	36,393	29,690	18,241
Accident Year 2015 | Commercial Lines
Claims Development [Line Items]
Incurred	39,333	39,311	39,093	38,824	37,795	36,372	34,478	31,861	26,633	22,442
Total IBNR	$ 0
Cumulative number of reported claims | Claim	1,756
Cumulative Paid	$ 39,154	39,116	38,685	37,563	35,833	34,497	30,475	22,549	17,817	10,470
Accident Year 2015 | Personal Lines
Claims Development [Line Items]
Incurred	15,452	15,456	15,448	15,427	15,427	15,364	15,285	14,721	13,445	10,877
Total IBNR	$ 0
Cumulative number of reported claims | Claim	3,737
Cumulative Paid	$ 15,452	15,452	15,444	15,416	15,290	15,250	15,159	13,844	11,873	$ 7,771
Accident Year 2016
Claims Development [Line Items]
Incurred	65,030	64,843	64,356	62,627	61,744	59,905	55,389	48,353	44,015
Total IBNR	$ 0
Cumulative number of reported claims | Claim	4,521
Cumulative Paid	$ 64,558	64,238	62,636	59,096	57,296	53,077	42,227	30,373	17,374
Accident Year 2016 | Commercial Lines
Claims Development [Line Items]
Incurred	49,349	49,162	48,677	46,993	46,089	44,355	40,440	34,935	32,396
Total IBNR	$ 0
Cumulative number of reported claims | Claim	2,365
Cumulative Paid	$ 48,877	48,557	46,957	43,644	41,945	37,967	27,785	19,135	10,255
Accident Year 2016 | Personal Lines
Claims Development [Line Items]
Incurred	15,681	15,681	15,679	15,634	15,655	15,550	14,949	13,418	11,619
Total IBNR	$ 0
Cumulative number of reported claims | Claim	2,156
Cumulative Paid	$ 15,681	15,681	15,679	15,452	15,351	15,110	14,442	11,238	$ 7,119
Accident Year 2017
Claims Development [Line Items]
Incurred	74,328	74,104	71,606	70,500	66,676	64,242	58,045	58,309
Total IBNR	$ 92
Cumulative number of reported claims | Claim	5,377
Cumulative Paid	$ 73,485	72,259	67,757	62,014	56,834	48,209	35,964	20,768
Accident Year 2017 | Commercial Lines
Claims Development [Line Items]
Incurred	59,366	59,149	56,649	55,589	51,883	49,749	44,495	44,251
Total IBNR	$ 92
Cumulative number of reported claims | Claim	3,561
Cumulative Paid	$ 58,523	57,304	52,800	47,148	42,308	34,205	23,020	12,448
Accident Year 2017 | Personal Lines
Claims Development [Line Items]
Incurred	14,962	14,955	14,957	14,911	14,793	14,493	13,550	14,058
Total IBNR	$ 0
Cumulative number of reported claims | Claim	1,816
Cumulative Paid	$ 14,962	14,955	14,957	14,866	14,526	14,004	12,944	$ 8,320
Accident Year 2018
Claims Development [Line Items]
Incurred	70,682	68,217	66,400	61,643	56,024	48,810	48,517
Total IBNR	$ 70
Cumulative number of reported claims | Claim	8,752
Cumulative Paid	$ 67,698	63,447	56,752	47,819	37,733	25,417	14,671
Accident Year 2018 | Commercial Lines
Claims Development [Line Items]
Incurred	64,349	61,881	60,102	55,261	49,741	42,432	42,624
Total IBNR	$ 70
Cumulative number of reported claims | Claim	5,838
Cumulative Paid	$ 61,365	57,114	50,508	41,577	31,633	19,799	10,375
Accident Year 2018 | Personal Lines
Claims Development [Line Items]
Incurred	6,333	6,336	6,298	6,382	6,283	6,378	5,893
Total IBNR	$ 0
Cumulative number of reported claims | Claim	2,914
Cumulative Paid	$ 6,333	6,333	6,244	6,242	6,100	5,618	$ 4,296
Accident Year 2019
Claims Development [Line Items]
Incurred	63,323	61,895	58,125	49,227	44,841	44,385
Total IBNR	$ 186
Cumulative number of reported claims | Claim	6,935
Cumulative Paid	$ 57,976	53,228	42,743	31,650	23,066	12,197
Accident Year 2019 | Commercial Lines
Claims Development [Line Items]
Incurred	60,464	59,028	55,263	46,329	42,129	41,286
Total IBNR	$ 186
Cumulative number of reported claims | Claim	6,132
Cumulative Paid	$ 55,117	50,369	39,893	28,958	20,462	10,078
Accident Year 2019 | Personal Lines
Claims Development [Line Items]
Incurred	2,859	2,867	2,862	2,898	2,712	3,099
Total IBNR	$ 0
Cumulative number of reported claims | Claim	803
Cumulative Paid	$ 2,859	2,859	2,850	2,692	2,604	$ 2,119
Accident Year 2020
Claims Development [Line Items]
Incurred	50,348	46,537	41,829	37,918	36,206
Total IBNR	$ 3,868
Cumulative number of reported claims | Claim	6,695
Cumulative Paid	$ 42,125	35,973	26,830	19,787	11,524
Accident Year 2020 | Commercial Lines
Claims Development [Line Items]
Incurred	47,731	43,918	39,193	35,328	33,867
Total IBNR	$ 3,868
Cumulative number of reported claims | Claim	6,354
Cumulative Paid	$ 39,508	33,354	24,225	17,332	10,217
Accident Year 2020 | Personal Lines
Claims Development [Line Items]
Incurred	2,617	2,619	2,636	2,590	2,339
Total IBNR	$ 0
Cumulative number of reported claims | Claim	341
Cumulative Paid	$ 2,617	2,619	2,605	2,455	$ 1,307
Accident Year 2021
Claims Development [Line Items]
Incurred	62,894	52,890	46,598	44,797
Total IBNR	$ 4,208
Cumulative number of reported claims | Claim	4,226
Cumulative Paid	$ 46,909	34,559	25,293	15,892
Accident Year 2021 | Commercial Lines
Claims Development [Line Items]
Incurred	58,682	48,650	42,266	40,388
Total IBNR	$ 4,208
Cumulative number of reported claims | Claim	3,902
Cumulative Paid	$ 42,714	30,478	21,313	12,870
Accident Year 2021 | Personal Lines
Claims Development [Line Items]
Incurred	4,212	4,240	4,332	4,409
Total IBNR	$ 0
Cumulative number of reported claims | Claim	324
Cumulative Paid	$ 4,195	4,081	3,980	$ 3,022
Accident Year 2022
Claims Development [Line Items]
Incurred	69,756	57,873	51,112
Total IBNR	$ 9,533
Cumulative number of reported claims | Claim	3,083
Cumulative Paid	$ 42,539	30,815	18,236
Accident Year 2022 | Commercial Lines
Claims Development [Line Items]
Incurred	61,647	49,751	41,708
Total IBNR	$ 953
Cumulative number of reported claims | Claim	3,033
Cumulative Paid	$ 34,451	22,892	12,839
Accident Year 2022 | Personal Lines
Claims Development [Line Items]
Incurred	8,109	8,122	9,404
Total IBNR	$ 0
Cumulative number of reported claims | Claim	50
Cumulative Paid	$ 8,088	7,923	$ 5,397
Accident Year 2023
Claims Development [Line Items]
Incurred	65,638	58,900
Total IBNR	$ 19,243
Cumulative number of reported claims | Claim	3,457
Cumulative Paid	$ 33,629	24,656
Accident Year 2023 | Commercial Lines
Claims Development [Line Items]
Incurred	45,921	39,456
Total IBNR	$ 19,185
Cumulative number of reported claims | Claim	2,681
Cumulative Paid	$ 14,869	8,486
Accident Year 2023 | Personal Lines
Claims Development [Line Items]
Incurred	19,717	19,444
Total IBNR	$ 58
Cumulative number of reported claims | Claim	776
Cumulative Paid	$ 18,760	$ 16,170
Accident Year 2024
Claims Development [Line Items]
Incurred	35,987
Total IBNR	$ 7,576
Cumulative number of reported claims | Claim	6,456
Cumulative Paid	$ 22,297
Accident Year 2024 | Commercial Lines
Claims Development [Line Items]
Incurred	16,949
Total IBNR	$ 6,253
Cumulative number of reported claims | Claim	3,288
Cumulative Paid	$ 6,776
Accident Year 2024 | Personal Lines
Claims Development [Line Items]
Incurred	19,038
Total IBNR	$ 1,323
Cumulative number of reported claims | Claim	3,168
Cumulative Paid	$ 15,521