PARENT COMPANY STATEMENTS - CONDENSED STATEMENTS OF CASH FLOWS (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income	$ 29,626	$ 25,252	$ 14,611	$ 24,278	$ 25,977	$ 28,525	$ 25,673	$ 23,642	$ 93,767	$ 103,817	$ 95,733
Adjustments to net cash from operating activities:
Net cash from operating activities									113,981	169,342	113,768
Cash flows from investing activities:
Net cash from investing activities									(54,932)	(626,524)	(331,546)
Cash flows from financing activities:
Proceeds from (payments on) short-term borrowings									(22,000)	22,000	(10,500)
Purchase of treasury stock									(575)	(579)	(559)
Sales of treasury stock									405	221	115
Net cash from financing activities									(37,507)	(95,776)	651,091
Net change in cash and cash equivalents									21,542	(552,958)	433,313
Beginning balance				130,282				683,240	130,282	683,240	249,927
Ending balance	151,824				130,282				151,824	130,282	683,240
Reportable Legal Entities | Parent Company
Cash flows from operating activities:
Net income									93,767	103,817	95,733
Adjustments to net cash from operating activities:
Equity in undistributed income of subsidiaries									(48,785)	(67,951)	(53,120)
Other changes									16,601	6,157	5,177
Net cash from operating activities									61,583	42,023	47,790
Cash flows from investing activities:
Return of capital from subsidiary									3,602	0	0
Net cash from investing activities									3,602	0	0
Cash flows from financing activities:
Proceeds from (payments on) short-term borrowings									0	0	(10,500)
Payments related to equity incentive plans									(3,135)	(1,780)	(1,914)
Purchase of treasury stock									(575)	(579)	(559)
Sales of treasury stock									405	221	115
Dividends paid									(47,094)	(40,838)	(34,640)
Net cash from financing activities									(50,399)	(42,976)	(47,498)
Net change in cash and cash equivalents									14,786	(953)	292
Beginning balance				$ 2,340				$ 3,293	2,340	3,293	3,001
Ending balance	$ 17,126				$ 2,340				$ 17,126	$ 2,340	$ 3,293