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Leases - Lease cost and other information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Lease Cost Components:
Amortization of ROU assets - finance leases	$ 117	$ 117	$ 233	$ 233
Interest on lease liabilities - finance leases	10	12	21	25
Operating lease cost (cost resulting from lease payments)	4,278	4,536	8,518	8,869
Short-term lease cost	109	231	215	374
Variable lease cost (cost excluded from lease payments)	840	761	1,475	1,198
Total lease cost	5,354	5,657	10,462	10,699
Supplemental Cash Flow and Other Information Related to Leases:
Finance lease - operating cash flows	10	12	21	25
Finance lease - financing cash flows	110	108	220	216
Operating lease - operating cash flows (fixed payments)	4,154	4,444	8,250	8,626
Operating lease - operating cash flows (net change asset/liability)	(3,321)	(3,545)	(6,608)	(6,848)
New ROU assets - operating leases	$ 701	$ 188	$ 701	$ 12,616
Weighted - average remaining lease term (years) - finance leases	4 years 11 months 4 days	5 years 11 months 1 day	4 years 11 months 4 days	5 years 11 months 1 day
Weighted - average remaining lease term (years) - operating leases	9 years 7 months 17 days	10 years 1 month 9 days	9 years 7 months 17 days	10 years 1 month 9 days
Weighted - average discount rate - finance leases	1.70%	1.70%	1.70%	1.70%
Weighted - average discount rate - operating leases	3.00%	3.00%	3.00%	3.00%
Maturity Analysis of Lease Liabilities:
2023 (excluding the quarter ended June 30, 2023)	$ 8,411		$ 8,411
2024	15,784		15,784
2025	14,435		14,435
2026	14,062		14,062
2027	13,122		13,122
Thereafter	68,760		68,760
Total undiscounted cash flows	134,574		134,574
Discount on cash flows	(20,014)		(20,014)
Total operating lease liabilities	$ 114,560		$ 114,560		$ 115,600
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Other Liabilities.		Other Liabilities.		Other Liabilities.

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