PARENT COMPANY STATEMENTS - CONDENSED STATEMENTS OF CASH FLOWS (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income	$ 25,977	$ 28,525	$ 25,673	$ 23,642	$ 24,283	$ 24,119	$ 24,348	$ 22,983	$ 103,817	$ 95,733	$ 84,337
Adjustments to net cash from operating activities:
Net cash from operating activities									169,342	113,768	87,228
Cash flows from financing activities
Purchase of treasury stock									(579)	(559)	(10,547)
Sales of treasury stock									221	115	119
Net cash from financing activities									(95,776)	651,091	775,342
Net change in cash and cash equivalents									(552,958)	433,313	150,546
Beginning balance				683,240				249,927	683,240	249,927	99,381
Ending balance	130,282				683,240				130,282	683,240	249,927
Reportable Legal Entities | Parent Company
Cash flows from operating activities:
Net income									103,817	95,733	84,337
Adjustments to net cash from operating activities:
Equity in undistributed income of subsidiaries									(67,951)	(53,120)	(53,828)
Other changes									6,157	5,177	1,257
Net cash from operating activities									42,023	47,790	31,766
Cash flows from financing activities
Proceeds from (payments on) short-term borrowings									0	(10,500)	10,500
Payments related to equity incentive plans									(1,780)	(1,914)	(2,137)
Purchase of treasury stock									(579)	(559)	(10,547)
Sales of treasury stock									221	115	119
Dividends paid									(40,838)	(34,640)	(30,566)
Net cash from financing activities									(42,976)	(47,498)	(32,631)
Net change in cash and cash equivalents									(953)	292	(865)
Beginning balance				$ 3,293				$ 3,001	3,293	3,001	3,866
Ending balance	$ 2,340				$ 3,293				$ 2,340	$ 3,293	$ 3,001