FAIR VALUE (Estimated Fair Value Financial Instruments (Including Carrying Amounts)) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financial assets:
Carried at fair value	$ 6,108,346	$ 3,294,361
Held to maturity	100,041	100,484
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	337,903	378,734
Time deposits in other financial institutions	3,129	3,564
Carried at fair value	2,026	0
Held to maturity	0	0
Other investments	0	0
Loans held for sale	0	0
Loans, net	0	0
Cash surrender value on life insurance	0	0
Derivatives	0	0
Financial liabilities:
Short term borrowings	0	0
Other borrowings	0	0
Derivatives	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate lock commitments
Financial assets:
Derivatives	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Forward commitments
Financial assets:
Derivatives	0	0
Financial liabilities:
Derivatives	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Demand deposits
Financial liabilities:
Deposits	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Savings deposits
Financial liabilities:
Deposits	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Time deposits
Financial liabilities:
Deposits	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial and industrial | Commercial and industrial
Financial assets:
Loans, net	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial and industrial | Real estate construction
Financial assets:
Loans, net	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Agricultural and agricultural real estate
Financial assets:
Loans, net	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential real estate
Financial assets:
Loans, net	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Consumer
Financial assets:
Loans, net	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Paycheck Protection Program ("PPP") | Commercial and industrial
Financial assets:
Loans, net	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Owner occupied commercial real estate | Commercial and industrial
Financial assets:
Loans, net	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-owner occupied commercial real estate | Commercial and industrial
Financial assets:
Loans, net	0	0
Significant Other Observable Inputs (Level 2)
Financial assets:
Cash and cash equivalents	0	0
Time deposits in other financial institutions	0	0
Carried at fair value	6,125,949	3,304,293
Held to maturity	100,041	100,484
Other investments	75,523	31,321
Loans held for sale	57,949	26,748
Loans, net	9,735,181	8,206,881
Cash surrender value on life insurance	187,664	171,625
Derivatives	44,102	17,527
Financial liabilities:
Short term borrowings	167,872	182,626
Other borrowings	458,806	278,169
Derivatives	51,962	21,462
Significant Other Observable Inputs (Level 2) | Interest rate lock commitments
Financial assets:
Derivatives	0	0
Significant Other Observable Inputs (Level 2) | Forward commitments
Financial assets:
Derivatives	0	15
Financial liabilities:
Derivatives	697	113
Significant Other Observable Inputs (Level 2) | Demand deposits
Financial liabilities:
Deposits	5,688,810	3,543,863
Significant Other Observable Inputs (Level 2) | Savings deposits
Financial liabilities:
Deposits	8,019,704	6,307,425
Significant Other Observable Inputs (Level 2) | Time deposits
Financial liabilities:
Deposits	1,273,468	1,193,043
Significant Other Observable Inputs (Level 2) | Commercial and industrial | Commercial and industrial
Financial assets:
Loans, net	2,379,785	2,606,080
Significant Other Observable Inputs (Level 2) | Commercial and industrial | Real estate construction
Financial assets:
Loans, net	849,224	924,041
Significant Other Observable Inputs (Level 2) | Agricultural and agricultural real estate
Financial assets:
Loans, net	685,278	564,198
Significant Other Observable Inputs (Level 2) | Residential real estate
Financial assets:
Loans, net	828,366	838,365
Significant Other Observable Inputs (Level 2) | Consumer
Financial assets:
Loans, net	407,914	469,939
Significant Other Observable Inputs (Level 2) | Paycheck Protection Program ("PPP") | Commercial and industrial
Financial assets:
Loans, net	957,785	0
Significant Other Observable Inputs (Level 2) | Owner occupied commercial real estate | Commercial and industrial
Financial assets:
Loans, net	1,739,523	1,408,036
Significant Other Observable Inputs (Level 2) | Non-owner occupied commercial real estate | Commercial and industrial
Financial assets:
Loans, net	1,887,306	1,396,222
Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	0	0
Time deposits in other financial institutions	0	0
Carried at fair value	0	0
Held to maturity	0	0
Other investments	0	0
Loans held for sale	0	0
Loans, net	34,488	36,464
Cash surrender value on life insurance	0	0
Derivatives	0	0
Financial liabilities:
Short term borrowings	0	0
Other borrowings	0	0
Derivatives	0	0
Significant Unobservable Inputs (Level 3) | Interest rate lock commitments
Financial assets:
Derivatives	1,827	637
Significant Unobservable Inputs (Level 3) | Forward commitments
Financial assets:
Derivatives	0	0
Financial liabilities:
Derivatives	0	0
Significant Unobservable Inputs (Level 3) | Demand deposits
Financial liabilities:
Deposits	0	0
Significant Unobservable Inputs (Level 3) | Savings deposits
Financial liabilities:
Deposits	0	0
Significant Unobservable Inputs (Level 3) | Time deposits
Financial liabilities:
Deposits	0	0
Significant Unobservable Inputs (Level 3) | Commercial and industrial | Commercial and industrial
Financial assets:
Loans, net	11,256	15,173
Significant Unobservable Inputs (Level 3) | Commercial and industrial | Real estate construction
Financial assets:
Loans, net	0	0
Significant Unobservable Inputs (Level 3) | Agricultural and agricultural real estate
Financial assets:
Loans, net	12,451	12,623
Significant Unobservable Inputs (Level 3) | Residential real estate
Financial assets:
Loans, net	0	4,978
Significant Unobservable Inputs (Level 3) | Consumer
Financial assets:
Loans, net	0	1,033
Significant Unobservable Inputs (Level 3) | Paycheck Protection Program ("PPP") | Commercial and industrial
Financial assets:
Loans, net	0	0
Significant Unobservable Inputs (Level 3) | Owner occupied commercial real estate | Commercial and industrial
Financial assets:
Loans, net	5,874	1,352
Significant Unobservable Inputs (Level 3) | Non-owner occupied commercial real estate | Commercial and industrial
Financial assets:
Loans, net	4,907	1,305
Carrying Amount
Financial assets:
Cash and cash equivalents	337,903	378,734
Time deposits in other financial institutions	3,129	3,564
Carried at fair value	6,127,975	3,312,796
Held to maturity	88,839	91,324
Other investments	75,253	31,321
Loans held for sale	57,949	26,748
Loans, net	9,891,445	8,297,522
Cash surrender value on life insurance	187,664	171,625
Derivatives	44,102	17,527
Financial liabilities:
Short term borrowings	167,872	182,626
Other borrowings	457,042	275,773
Derivatives	51,962	21,462
Carrying Amount | Interest rate lock commitments
Financial assets:
Derivatives	1,827	681
Carrying Amount | Forward commitments
Financial assets:
Derivatives	0	0
Financial liabilities:
Derivatives	697	113
Carrying Amount | Demand deposits
Financial liabilities:
Deposits	5,688,810	3,543,863
Carrying Amount | Savings deposits
Financial liabilities:
Deposits	8,019,704	6,307,425
Carrying Amount | Time deposits
Financial liabilities:
Deposits	1,271,391	1,193,043
Carrying Amount | Commercial and industrial | Commercial and industrial
Financial assets:
Loans, net	2,495,981	2,500,022
Carrying Amount | Commercial and industrial | Real estate construction
Financial assets:
Loans, net	843,140	1,015,482
Carrying Amount | Agricultural and agricultural real estate
Financial assets:
Loans, net	707,397	560,164
Carrying Amount | Residential real estate
Financial assets:
Loans, net	828,507	830,773
Carrying Amount | Consumer
Financial assets:
Loans, net	401,622	438,516
Carrying Amount | Paycheck Protection Program ("PPP") | Commercial and industrial
Financial assets:
Loans, net	957,785	0
Carrying Amount | Owner occupied commercial real estate | Commercial and industrial
Financial assets:
Loans, net	1,756,405	1,464,490
Carrying Amount | Non-owner occupied commercial real estate | Commercial and industrial
Financial assets:
Loans, net	1,900,608	1,488,075
Estimated Fair Value
Financial assets:
Cash and cash equivalents	337,903	378,734
Time deposits in other financial institutions	3,129	3,564
Carried at fair value	6,127,975	3,304,293
Held to maturity	100,041	100,484
Other investments	75,523	31,321
Loans held for sale	57,949	26,748
Loans, net	9,769,669	8,243,345
Cash surrender value on life insurance	187,664	171,625
Derivatives	44,102	17,527
Financial liabilities:
Short term borrowings	167,872	182,626
Other borrowings	458,806	278,169
Derivatives	51,962	21,462
Estimated Fair Value | Interest rate lock commitments
Financial assets:
Derivatives	1,827	637
Estimated Fair Value | Forward commitments
Financial assets:
Derivatives	0	15
Financial liabilities:
Derivatives	697	113
Estimated Fair Value | Demand deposits
Financial liabilities:
Deposits	5,688,810	3,543,863
Estimated Fair Value | Savings deposits
Financial liabilities:
Deposits	8,019,704	6,307,425
Estimated Fair Value | Time deposits
Financial liabilities:
Deposits	1,273,468	1,193,043
Estimated Fair Value | Commercial and industrial | Commercial and industrial
Financial assets:
Loans, net	2,391,041	2,621,253
Estimated Fair Value | Commercial and industrial | Real estate construction
Financial assets:
Loans, net	849,224	924,041
Estimated Fair Value | Agricultural and agricultural real estate
Financial assets:
Loans, net	697,729	576,821
Estimated Fair Value | Residential real estate
Financial assets:
Loans, net	828,366	843,343
Estimated Fair Value | Consumer
Financial assets:
Loans, net	407,914	470,972
Estimated Fair Value | Paycheck Protection Program ("PPP") | Commercial and industrial
Financial assets:
Loans, net	957,785	0
Estimated Fair Value | Owner occupied commercial real estate | Commercial and industrial
Financial assets:
Loans, net	1,745,397	1,409,388
Estimated Fair Value | Non-owner occupied commercial real estate | Commercial and industrial
Financial assets:
Loans, net	$ 1,892,213	$ 1,397,527