LOANS AND ALLOWANCE FOR LOAN LOSSES (Summary of Aging of the Loan Portfolio by Class) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater Than 90 Days and Still Accruing	$ 9,132	$ 13,634
Greater than 90 Days and still Accruing, % of total loans	0.07%	0.10%
Nonaccrual	$ 31,100	$ 42,448	$ 45,204	$ 28,200
Nonaccrual, % of total loans	0.24%	0.30%
Total Loans	$ 13,195,843	$ 14,021,314
Total loans, % of total loans	100.00%	100.00%
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	$ 13,134,805	$ 13,929,049
Current, % of total loans	99.54%	99.34%
30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	$ 15,094	$ 27,024
Past Due, % of total loans	0.11%	0.19%
60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	$ 5,712	$ 9,159
Past Due, % of total loans	0.04%	0.07%
Construction and Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater Than 90 Days and Still Accruing	$ 299	$ 0
Nonaccrual	2,697	3,072	4,060
Total Loans	862,236	925,798
Construction and Land Development | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	857,883	920,276
Construction and Land Development | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	1,357	1,903
Construction and Land Development | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	0	547
Commercial Real Estate - Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater Than 90 Days and Still Accruing	1,257	3,727
Nonaccrual	5,637	7,128	13,889
Total Loans	1,995,409	2,128,909
Commercial Real Estate - Owner Occupied | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	1,987,133	2,114,804
Commercial Real Estate - Owner Occupied | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	1,230	1,870
Commercial Real Estate - Owner Occupied | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	152	1,380
Commercial Real Estate - Non-Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater Than 90 Days and Still Accruing	433	148
Nonaccrual	3,641	2,317	1,368
Total Loans	3,789,377	3,657,562
Commercial Real Estate - Non-Owner Occupied | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	3,783,211	3,651,232
Commercial Real Estate - Non-Owner Occupied | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	1,965	2,144
Commercial Real Estate - Non-Owner Occupied | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	127	1,721
Multifamily Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater Than 90 Days and Still Accruing	0	0
Nonaccrual	113	33	0
Total Loans	778,626	814,745
Multifamily Real Estate | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	778,429	814,095
Multifamily Real Estate | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	84	617
Multifamily Real Estate | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	0	0
Commercial and Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater Than 90 Days and Still Accruing	1,897	1,114
Nonaccrual	1,647	2,107	3,037
Total Loans	2,542,243	3,263,460
Commercial and Industrial | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	2,536,100	3,257,201
Commercial and Industrial | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	1,161	1,848
Commercial and Industrial | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	1,438	1,190
Residential 1-4 Family - Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater Than 90 Days and Still Accruing	990	1,560
Nonaccrual	2,285	9,993	6,492
Total Loans	607,337	671,949
Residential 1-4 Family - Commercial | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	601,946	657,351
Residential 1-4 Family - Commercial | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	1,844	2,227
Residential 1-4 Family - Commercial | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	272	818
Residential 1-4 Family - Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater Than 90 Days and Still Accruing	3,013	5,699
Nonaccrual	11,397	12,600	13,117
Total Loans	816,524	822,866
Residential 1-4 Family - Mortgage | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	795,821	792,852
Total Loans	795,821	792,852
Residential 1-4 Family - Mortgage | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	3,368	10,182
Total Loans	3,368	10,182
Residential 1-4 Family - Mortgage | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	2,925	1,533
Total Loans	2,925	1,533
Residential 1-4 Family - Mortgage | Greater Than 90 Days and still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	3,013	5,699
Residential 1-4 Family - Mortgage | Nonaccrual
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	11,397	12,600
Residential 1-4 Family - Revolving
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater Than 90 Days and Still Accruing	882	826
Nonaccrual	3,406	4,629	2,490
Total Loans	560,796	596,996
Residential 1-4 Family - Revolving | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	554,652	587,522
Total Loans	554,652	587,522
Residential 1-4 Family - Revolving | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	1,493	2,975
Total Loans	1,493	2,975
Residential 1-4 Family - Revolving | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	363	1,044
Total Loans	363	1,044
Residential 1-4 Family - Revolving | Greater Than 90 Days and still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	882	826
Residential 1-4 Family - Revolving | Nonaccrual
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	3,406	4,629
Auto
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater Than 90 Days and Still Accruing	241	166
Nonaccrual	223	500	565
Total Loans	461,052	401,324
Auto | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	458,473	398,206
Total Loans	458,473	398,206
Auto | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	1,866	2,076
Total Loans	1,866	2,076
Auto | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	249	376
Total Loans	249	376
Auto | Greater Than 90 Days and still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	241	166
Auto | Nonaccrual
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	223	500
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater Than 90 Days and Still Accruing	120	394
Nonaccrual	54	69	88
Total Loans	176,992	247,730
Consumer | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	175,943	245,551
Total Loans	175,943	245,551
Consumer | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	689	1,166
Total Loans	689	1,166
Consumer | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	186	550
Total Loans	186	550
Consumer | Greater Than 90 Days and still Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	120	394
Consumer | Nonaccrual
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	54	69
Other Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Greater Than 90 Days and Still Accruing	0	0
Nonaccrual	0	0	$ 98
Total Loans	605,251	489,975
Other Commercial | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	605,214	489,959
Other Commercial | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	37	16
Other Commercial | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable, current and past due	$ 0	$ 0