REVENUE (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
Disaggregation of Revenue [Line Items]
Total noninterest income in-scope of Topic 606									$ 97,533	$ 93,587	$ 87,666
Loan servicing income									1,561	2,741	3,276
Capital markets fees									10,007	11,543	1,324
Securities gains, net									(141,539)	(425)	5,910
Unrealized (loss) gain on equity securities, net									240	(622)	58
Net gains on sale of loans held for sale									3,880	9,032	20,605
Valuation adjustment on servicing rights									0	1,658	1,088
Income on bank owned life insurance									3,771	2,341	3,762
Other noninterest income									3,621	8,409	5,246
Total noninterest income out-of-scope of Topic 606									(118,459)	34,677	41,269
TOTAL NONINTEREST INCOME (LOSS)	$ (111,801)	$ 28,383	$ 32,493	$ 29,999	$ 29,975	$ 29,181	$ 34,539	$ 34,569	(20,926)	128,264	128,935
Service charges and fees on deposit accounts
Disaggregation of Revenue [Line Items]
Total noninterest income in-scope of Topic 606									21,037	18,625	16,414
Overdraft fees
Disaggregation of Revenue [Line Items]
Total noninterest income in-scope of Topic 606									11,878	12,136	11,005
Customer service and other service fees
Disaggregation of Revenue [Line Items]
Total noninterest income in-scope of Topic 606									358	375	220
Credit card fee income
Disaggregation of Revenue [Line Items]
Total noninterest income in-scope of Topic 606									31,102	27,560	21,623
Debit card income
Disaggregation of Revenue [Line Items]
Total noninterest income in-scope of Topic 606									9,649	9,335	10,441
Total service charges and fees
Disaggregation of Revenue [Line Items]
Total noninterest income in-scope of Topic 606									74,024	68,031	59,703
Trust fees
Disaggregation of Revenue [Line Items]
Total noninterest income in-scope of Topic 606									20,715	22,570	24,417
Brokerage and insurance commissions
Disaggregation of Revenue [Line Items]
Total noninterest income in-scope of Topic 606									$ 2,794	$ 2,986	$ 3,546