LOANS (Allowance for credit losses on financing receivables) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Total exposure on lending relationships (or more)	$ 500
Individually Evaluated for Credit Losses	8,364		$ 7,109
Collectively Evaluated for Credit Losses	102,834		102,374
Total	111,198	$ 112,707	109,483	$ 101,353	$ 100,522	$ 110,088
Loans Individually Evaluated for Credit Losses	48,009		44,991
Loans Collectively Evaluated for Credit Losses	11,669,965		11,383,361
Total	11,717,974		11,428,352
Commercial and industrial | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually Evaluated for Credit Losses	6,817		6,670
Collectively Evaluated for Credit Losses	22,579		22,401
Total	29,396	31,823	29,071	27,668	25,800	27,738
Loans Individually Evaluated for Credit Losses	16,051		18,712
Loans Collectively Evaluated for Credit Losses	3,574,629		3,445,702
Total	3,590,680		3,464,414
Commercial and industrial | Paycheck Protection Program ("PPP")
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually Evaluated for Credit Losses	0		0
Collectively Evaluated for Credit Losses	0		0
Total	0		0
Loans Individually Evaluated for Credit Losses	0		0
Loans Collectively Evaluated for Credit Losses	4,139		11,025
Total	4,139		11,025
Commercial and industrial | Owner occupied commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually Evaluated for Credit Losses	290		376
Collectively Evaluated for Credit Losses	14,419		13,572
Total	14,709	14,151	13,948	17,658	17,975	19,214
Loans Individually Evaluated for Credit Losses	7,629		7,932
Loans Collectively Evaluated for Credit Losses	2,391,069		2,257,375
Total	2,398,698		2,265,307
Commercial and industrial | Non-owner occupied commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually Evaluated for Credit Losses	257		0
Collectively Evaluated for Credit Losses	17,719		16,539
Total	17,976	17,062	16,539	15,738	16,013	17,908
Loans Individually Evaluated for Credit Losses	14,018		11,371
Loans Collectively Evaluated for Credit Losses	2,516,718		2,319,569
Total	2,530,736		2,330,940
Commercial and industrial | Real estate construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually Evaluated for Credit Losses	0		0
Collectively Evaluated for Credit Losses	28,246		29,998
Total	28,246	30,138	29,998	19,391	21,397	22,538
Loans Individually Evaluated for Credit Losses	910		1,518
Loans Collectively Evaluated for Credit Losses	1,012,224		1,074,564
Total	1,013,134		1,076,082
Agricultural and agricultural real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually Evaluated for Credit Losses	1,000		63
Collectively Evaluated for Credit Losses	2,511		2,571
Total	3,511	2,546	2,634	2,948	2,667	5,213
Loans Individually Evaluated for Credit Losses	7,147		3,851
Loans Collectively Evaluated for Credit Losses	832,670		916,659
Total	839,817		920,510
Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually Evaluated for Credit Losses	0		0
Collectively Evaluated for Credit Losses	7,644		7,711
Total	7,644	7,564	7,711	8,571	7,875	8,427
Loans Individually Evaluated for Credit Losses	2,254		1,607
Loans Collectively Evaluated for Credit Losses	826,183		851,754
Total	828,437		853,361
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually Evaluated for Credit Losses	0		0
Collectively Evaluated for Credit Losses	9,716		9,582
Total	9,716	$ 9,423	9,582	$ 9,379	$ 8,795	$ 9,050
Loans Individually Evaluated for Credit Losses	0		0
Loans Collectively Evaluated for Credit Losses	512,333		506,713
Total	$ 512,333		$ 506,713