LOANS (Loans by credit quality indicator) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	$ 2,800,525	$ 3,398,505
Year Two	2,705,447	1,480,531
Year Three	1,113,798	1,234,564
Year Four	897,800	751,481
Year Five	485,477	586,363
Year Six and Prior	1,263,073	1,134,111
Revolving	1,657,412	1,369,017
Total	10,923,532	9,954,572
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	2,759,068	3,279,966
Year Two	2,636,680	1,391,907
Year Three	1,043,856	1,116,618
Year Four	788,547	617,337
Year Five	379,537	522,707
Year Six and Prior	1,140,306	978,672
Revolving	1,594,402	1,306,109
Total	10,342,396	9,213,316
Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	26,334	41,994
Year Two	11,564	49,038
Year Three	18,102	63,780
Year Four	51,653	96,879
Year Five	55,482	24,388
Year Six and Prior	71,210	62,313
Revolving	29,250	30,833
Total	263,595	369,225
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	15,123	76,545
Year Two	57,203	39,586
Year Three	51,840	54,166
Year Four	57,600	37,265
Year Five	50,458	39,268
Year Six and Prior	51,557	93,126
Revolving	33,760	32,075
Total	317,541	372,031
Commercial and industrial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	819,004	635,180
Year Two	478,684	378,714
Year Three	293,900	229,560
Year Four	144,604	106,439
Year Five	76,008	181,939
Year Six and Prior	439,892	357,122
Revolving	1,026,611	756,131
Total	3,278,703	2,645,085
Commercial and industrial | Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	802,007	604,659
Year Two	463,440	359,533
Year Three	280,255	203,960
Year Four	111,725	89,694
Year Five	64,394	171,709
Year Six and Prior	425,882	330,094
Revolving	970,691	708,525
Total	3,118,394	2,468,174
Commercial and industrial | Commercial and industrial | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	8,503	10,633
Year Two	3,509	12,790
Year Three	4,036	12,550
Year Four	5,597	8,210
Year Five	4,477	3,611
Year Six and Prior	2,187	14,976
Revolving	24,689	24,626
Total	52,998	87,396
Commercial and industrial | Commercial and industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	8,494	19,888
Year Two	11,735	6,391
Year Three	9,609	13,050
Year Four	27,282	8,535
Year Five	7,137	6,619
Year Six and Prior	11,823	12,052
Revolving	31,231	22,980
Total	107,311	89,515
Commercial and industrial | Paycheck Protection Program ("PPP")
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	174,028
Year Two	12,610	25,855
Year Three	896	0
Year Four	0	0
Year Five	0	0
Year Six and Prior	0	0
Revolving	0	0
Total	13,506	199,883
Commercial and industrial | Paycheck Protection Program ("PPP") | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	146,370
Year Two	9,977	25,707
Year Three	891	0
Year Four	0	0
Year Five	0	0
Year Six and Prior	0	0
Revolving	0	0
Total	10,868	172,077
Commercial and industrial | Paycheck Protection Program ("PPP") | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	10,726
Year Two	8	127
Year Three	0	0
Year Four	0	0
Year Five	0	0
Year Six and Prior	0	0
Revolving	0	0
Total	8	10,853
Commercial and industrial | Paycheck Protection Program ("PPP") | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	16,932
Year Two	2,625	21
Year Three	5	0
Year Four	0	0
Year Five	0	0
Year Six and Prior	0	0
Revolving	0	0
Total	2,630	16,953
Commercial and industrial | Owner occupied commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	463,059	956,677
Year Two	833,370	362,777
Year Three	308,979	336,990
Year Four	291,617	194,246
Year Five	120,154	144,086
Year Six and Prior	232,557	209,540
Revolving	36,237	36,018
Total	2,285,973	2,240,334
Commercial and industrial | Owner occupied commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	449,289	940,043
Year Two	805,870	328,052
Year Three	273,696	315,497
Year Four	275,330	180,936
Year Five	111,317	115,142
Year Six and Prior	207,964	189,647
Revolving	35,402	34,233
Total	2,158,868	2,103,550
Commercial and industrial | Owner occupied commercial real estate | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	11,806	4,676
Year Two	5,806	13,956
Year Three	3,114	7,759
Year Four	5,573	10,501
Year Five	6,601	15,032
Year Six and Prior	5,923	6,830
Revolving	35	35
Total	38,858	58,789
Commercial and industrial | Owner occupied commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	1,964	11,958
Year Two	21,694	20,769
Year Three	32,169	13,734
Year Four	10,714	2,809
Year Five	2,236	13,912
Year Six and Prior	18,670	13,063
Revolving	800	1,750
Total	88,247	77,995
Commercial and industrial | Non-owner occupied commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	577,286	630,444
Year Two	535,518	282,814
Year Three	233,370	373,109
Year Four	329,432	269,649
Year Five	198,965	170,947
Year Six and Prior	275,250	254,459
Revolving	69,721	29,169
Total	2,219,542	2,010,591
Commercial and industrial | Non-owner occupied commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	576,309	609,968
Year Two	524,138	263,093
Year Three	220,635	315,815
Year Four	274,791	236,823
Year Five	134,255	152,059
Year Six and Prior	206,540	166,792
Revolving	69,166	28,728
Total	2,005,834	1,773,278
Commercial and industrial | Non-owner occupied commercial real estate | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	771	4,754
Year Two	802	9,109
Year Three	5,222	35,496
Year Four	38,563	29,227
Year Five	42,302	4,865
Year Six and Prior	58,714	35,901
Revolving	555	0
Total	146,929	119,352
Commercial and industrial | Non-owner occupied commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	206	15,722
Year Two	10,578	10,612
Year Three	7,513	21,798
Year Four	16,078	3,599
Year Five	22,408	14,023
Year Six and Prior	9,996	51,766
Revolving	0	441
Total	66,779	117,961
Commercial and industrial | Real estate construction
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	475,967	383,987
Year Two	351,522	207,787
Year Three	105,461	171,797
Year Four	41,181	62,987
Year Five	7,287	7,163
Year Six and Prior	6,684	7,877
Revolving	7,915	14,521
Total	996,017	856,119
Commercial and industrial | Real estate construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	475,313	381,283
Year Two	351,155	206,879
Year Three	103,214	169,606
Year Four	40,638	14,197
Year Five	2,983	7,163
Year Six and Prior	6,602	7,823
Revolving	7,915	14,507
Total	987,820	801,458
Commercial and industrial | Real estate construction | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	654	2,704
Year Two	11	858
Year Three	1,220	2,145
Year Four	0	44,846
Year Five	0	0
Year Six and Prior	16	0
Revolving	0	14
Total	1,901	50,567
Commercial and industrial | Real estate construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	0
Year Two	356	50
Year Three	1,027	46
Year Four	543	3,944
Year Five	4,304	0
Year Six and Prior	66	54
Revolving	0	0
Total	6,296	4,094
Agricultural and agricultural real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	230,088	230,447
Year Two	162,293	113,515
Year Three	88,183	57,525
Year Four	40,831	51,008
Year Five	37,752	25,274
Year Six and Prior	48,558	46,445
Revolving	173,649	229,539
Total	781,354	753,753
Agricultural and agricultural real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	221,687	217,179
Year Two	153,294	102,030
Year Three	84,087	47,927
Year Four	37,598	32,913
Year Five	24,681	22,029
Year Six and Prior	43,203	35,548
Revolving	169,970	220,065
Total	734,520	677,691
Agricultural and agricultural real estate | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	4,131	4,018
Year Two	536	10,390
Year Three	3,892	4,688
Year Four	706	2,270
Year Five	471	33
Year Six and Prior	1,036	2,038
Revolving	2,539	2,948
Total	13,311	26,385
Agricultural and agricultural real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	4,270	9,250
Year Two	8,463	1,095
Year Three	204	4,910
Year Four	2,527	15,825
Year Five	12,600	3,212
Year Six and Prior	4,319	8,859
Revolving	1,140	6,526
Total	33,523	49,677
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	169,121	317,748
Year Two	279,330	88,298
Year Three	69,099	51,922
Year Four	42,539	57,542
Year Five	39,613	45,492
Year Six and Prior	231,889	238,264
Revolving	21,337	30,017
Total	852,928	829,283
Residential real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	168,663	311,292
Year Two	277,074	86,355
Year Three	67,491	50,762
Year Four	41,412	53,773
Year Five	36,411	43,619
Year Six and Prior	224,410	230,566
Revolving	21,187	29,017
Total	836,648	805,384
Residential real estate | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	429	3,928
Year Two	769	1,499
Year Three	562	750
Year Four	987	1,452
Year Five	1,554	734
Year Six and Prior	2,377	1,977
Revolving	0	1,000
Total	6,678	11,340
Residential real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	29	2,528
Year Two	1,487	444
Year Three	1,046	410
Year Four	140	2,317
Year Five	1,648	1,139
Year Six and Prior	5,102	5,721
Revolving	150	0
Total	9,602	12,559
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	66,000	69,994
Year Two	52,120	20,771
Year Three	13,910	13,661
Year Four	7,596	9,610
Year Five	5,698	11,462
Year Six and Prior	28,243	20,404
Revolving	321,942	273,622
Total	495,509	419,524
Consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	65,800	69,172
Year Two	51,732	20,258
Year Three	13,587	13,051
Year Four	7,053	9,001
Year Five	5,496	10,986
Year Six and Prior	25,705	18,202
Revolving	320,071	271,034
Total	489,444	411,704
Consumer | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	40	555
Year Two	123	309
Year Three	56	392
Year Four	227	373
Year Five	77	113
Year Six and Prior	957	591
Revolving	1,432	2,210
Total	2,912	4,543
Consumer | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	160	267
Year Two	265	204
Year Three	267	218
Year Four	316	236
Year Five	125	363
Year Six and Prior	1,581	1,611
Revolving	439	378
Total	$ 3,153	$ 3,277