LOANS - Activity in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2021		Jun. 30, 2020	Jun. 30, 2021		Jun. 30, 2020
Allowance for loan losses:
Balance at beginning of period	$ 32,663		$ 20,804	$ 35,820	[1]	$ 13,908
Impact of ASC 326 adoption on non-PCD loans				(718)
Impact of ASC 326 adoption on PCD loans				1,115
Provision for credit losses	0		7,606	0		14,708
Loans charged-off:	(888)		869	(5,011)		1,369
Recoveries	682		523	1,251		817
Balance at end of period	32,457	[1]	28,064	32,457	[1]	28,064
Commercial financial and agriculture
Allowance for loan losses:
Balance at beginning of period	4,158		4,466	6,214		3,043
Impact of ASC 326 adoption on non-PCD loans				(1,319)
Impact of ASC 326 adoption on PCD loans				166
Provision for credit losses			883			2,329
Loans charged-off:	(490)		165	(1,476)		264
Recoveries	242		24	325		100
Balance at end of period	3,910		5,208	3,910		5,208
Commercial real estate
Allowance for loan losses:
Balance at beginning of period	17,578		13,095	24,319		8,836
Impact of ASC 326 adoption on non-PCD loans				(4,607)
Impact of ASC 326 adoption on PCD loans				575
Provision for credit losses			5,202			9,725
Loans charged-off:	(166)		63	(3,007)		396
Recoveries	161		292	293		361
Balance at end of period	17,573		18,526	17,573		18,526
Consumer real estate
Allowance for loan losses:
Balance at beginning of period	10,280		2,840	4,736		1,694
Impact of ASC 326 adoption on non-PCD loans				5,257
Impact of ASC 326 adoption on PCD loans				372
Provision for credit losses			874			1,980
Loans charged-off:	(124)		87	(263)		96
Recoveries	183		114	237		163
Balance at end of period	10,339		3,741	10,339		3,741
Consumer installment
Allowance for loan losses:
Balance at beginning of period	647		403	551		296
Impact of ASC 326 adoption on non-PCD loans				(49)
Impact of ASC 326 adoption on PCD loans				2
Provision for credit losses			517			583
Loans charged-off:	(108)		554	(265)		613
Recoveries	96		93	396		193
Balance at end of period	$ 635		459	$ 635		459
Paycheck Protection Program
Allowance for loan losses:
Balance at beginning of period			0
Provision for credit losses			130			130
Balance at end of period			130			130
Unallocated
Allowance for loan losses:
Balance at beginning of period			$ 0			39
Provision for credit losses						$ (39)

[1] – Beginning January 1, 2021, allowance for credit losses is based on current expected credit loss methodology. Prior to January 1, 2021, allowance for loan loss was based on incurred loss methodology