LOANS (Troubled debt restructuring) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) loan	Sep. 30, 2021 USD ($) loan	Sep. 30, 2022 USD ($) loan	Sep. 30, 2021 USD ($) loan	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	2	0	2	2
Pre- Modification Recorded Investment	$ 6,458	$ 0	$ 6,458	$ 7,850
Post- Modification Recorded Investment	6,458	0	6,458	7,850
Financing receivable, before allowance for credit loss	10,923,532		10,923,532			$ 9,954,572
Nonaccrual	64,560		64,560			69,369
Allowance For Credit Losses	105,715	117,533	105,715	117,533	$ 101,353	110,088	$ 120,726	$ 131,606
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	(938)	(1,167)	(15,628)	(6,790)
Recoveries	912	2,422	2,694	3,615
Provision (benefit)	$ 4,388	$ (4,448)	$ 8,561	$ (10,898)
Commercial and industrial | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0	0	0
Pre- Modification Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post- Modification Recorded Investment	0	0	0	0
Financing receivable, before allowance for credit loss	3,278,703		3,278,703			2,645,085
Nonaccrual	25,156		25,156			18,228
Allowance For Credit Losses	30,263	27,908	30,263	27,908	27,668	27,738	31,332	38,818
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	(385)	(106)	(5,528)	(1,896)
Recoveries	506	1,553	1,157	2,111
Provision (benefit)	$ 2,474	$ (4,871)	$ 6,896	$ (11,125)
Commercial and industrial | Paycheck Protection Program ("PPP")
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0	0	0
Pre- Modification Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post- Modification Recorded Investment	0	$ 0	0	$ 0
Financing receivable, before allowance for credit loss	13,506		13,506			199,883
Nonaccrual	5		5			0
Allowance For Credit Losses	$ 0		$ 0			0
Commercial and industrial | Owner occupied commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	1	0	1	0
Pre- Modification Recorded Investment	$ 5,058	$ 0	$ 5,058	$ 0
Post- Modification Recorded Investment	5,058	0	5,058	0
Financing receivable, before allowance for credit loss	2,285,973		2,285,973			2,240,334
Nonaccrual	9,827		9,827			11,150
Allowance For Credit Losses	16,972	19,128	16,972	19,128	17,658	19,214	19,990	20,001
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0	(119)	0	(232)
Recoveries	0	46	40	143
Provision (benefit)	$ (686)	$ (789)	$ (2,282)	$ (784)
Commercial and industrial | Non-owner occupied commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0	0	2
Pre- Modification Recorded Investment	$ 0	$ 0	$ 0	$ 7,850
Post- Modification Recorded Investment	0	0	0	7,850
Financing receivable, before allowance for credit loss	2,219,542		2,219,542			2,010,591
Nonaccrual	11,904		11,904			13,316
Allowance For Credit Losses	14,809	22,115	14,809	22,115	15,738	17,908	22,828	20,873
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0	0	(322)	(1,637)
Recoveries	20	20	53	33
Provision (benefit)	$ (949)	$ (733)	$ (2,830)	$ 2,846
Commercial and industrial | Real estate construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0	0	0
Pre- Modification Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post- Modification Recorded Investment	0	0	0	0
Financing receivable, before allowance for credit loss	996,017		996,017			856,119
Nonaccrual	2,271		2,271			368
Allowance For Credit Losses	24,270	23,698	24,270	23,698	19,391	22,538	19,580	20,080
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	(35)	0	(35)	(10)
Recoveries	3	2	12	8
Provision (benefit)	$ 4,911	$ 4,116	$ 1,755	$ 3,620
Agricultural and agricultural real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	1	0	1	0
Pre- Modification Recorded Investment	$ 1,400	$ 0	$ 1,400	$ 0
Post- Modification Recorded Investment	1,400	0	1,400	0
Financing receivable, before allowance for credit loss	781,354		781,354			753,753
Nonaccrual	8,154		8,154			15,686
Allowance For Credit Losses	2,567	6,326	2,567	6,326	2,948	5,213	7,160	7,129
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	(34)	(195)	(3,163)	(870)
Recoveries	76	466	653	487
Provision (benefit)	$ (423)	$ (1,105)	$ (136)	$ (420)
Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0	0	0
Pre- Modification Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post- Modification Recorded Investment	0	0	0	0
Financing receivable, before allowance for credit loss	852,928		852,928			829,283
Nonaccrual	6,112		6,112			9,167
Allowance For Credit Losses	7,426	9,238	7,426	9,238	8,571	8,427	9,741	11,935
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	(1)	(22)	(138)	(113)
Recoveries	0	2	0	7
Provision (benefit)	$ (1,144)	$ (483)	$ (863)	$ (2,591)
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0	0	0
Pre- Modification Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post- Modification Recorded Investment	0	0	0	0
Financing receivable, before allowance for credit loss	495,509		495,509			419,524
Nonaccrual	1,131		1,131			1,454
Allowance For Credit Losses	9,408	9,120	9,408	9,120	$ 9,379	$ 9,050	$ 10,095	$ 12,770
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	(483)	(725)	(6,442)	(2,032)
Recoveries	307	333	779	826
Provision (benefit)	$ 205	$ (583)	$ 6,021	$ (2,444)