LOANS (Allowance for credit losses on financing receivables) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually Evaluated for Credit Losses	$ 3,610	$ 7,646
Collectively Evaluated for Credit Losses	96,912	102,442
Total	100,522	110,088	$ 130,172	$ 131,606
Loans Individually Evaluated for Credit Losses	47,503	49,288
Loans Collectively Evaluated for Credit Losses	10,129,882	9,905,284
Total	10,177,385	9,954,572
Commercial and industrial | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually Evaluated for Credit Losses	2,956	4,562
Collectively Evaluated for Credit Losses	22,844	23,176
Total	25,800	27,738	36,095	38,818
Loans Individually Evaluated for Credit Losses	13,503	13,551
Loans Collectively Evaluated for Credit Losses	2,801,010	2,631,534
Total	2,814,513	2,645,085
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	0	0
Loans Individually Evaluated for Credit Losses	0	0
Loans Collectively Evaluated for Credit Losses	74,065	199,883
Total	74,065	199,883
Commercial and industrial | Owner occupied commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually Evaluated for Credit Losses	37	105
Collectively Evaluated for Credit Losses	17,938	19,109
Total	17,975	19,214	19,416	20,001
Loans Individually Evaluated for Credit Losses	9,284	8,552
Loans Collectively Evaluated for Credit Losses	2,256,792	2,231,782
Total	2,266,076	2,240,334
Commercial and industrial | Non-owner occupied commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually Evaluated for Credit Losses	506	610
Collectively Evaluated for Credit Losses	15,507	17,298
Total	16,013	17,908	24,694	20,873
Loans Individually Evaluated for Credit Losses	12,244	12,557
Loans Collectively Evaluated for Credit Losses	2,149,517	1,998,034
Total	2,161,761	2,010,591
Commercial and industrial | Real estate construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually Evaluated for Credit Losses	31	0
Collectively Evaluated for Credit Losses	21,366	22,538
Total	21,397	22,538	19,931	20,080
Loans Individually Evaluated for Credit Losses	2,015	0
Loans Collectively Evaluated for Credit Losses	840,468	856,119
Total	842,483	856,119
Agricultural and agricultural real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually Evaluated for Credit Losses	80	2,369
Collectively Evaluated for Credit Losses	2,587	2,844
Total	2,667	5,213	7,111	7,129
Loans Individually Evaluated for Credit Losses	9,594	13,773
Loans Collectively Evaluated for Credit Losses	756,849	739,980
Total	766,443	753,753
Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually Evaluated for Credit Losses	0	0
Collectively Evaluated for Credit Losses	7,875	8,427
Total	7,875	8,427	11,012	11,935
Loans Individually Evaluated for Credit Losses	863	855
Loans Collectively Evaluated for Credit Losses	824,379	828,428
Total	825,242	829,283
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually Evaluated for Credit Losses	0	0
Collectively Evaluated for Credit Losses	8,795	9,050
Total	8,795	9,050	$ 11,913	$ 12,770
Loans Individually Evaluated for Credit Losses	0	0
Loans Collectively Evaluated for Credit Losses	426,802	419,524
Total	$ 426,802	$ 419,524