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LOANS (Total Loans Outstanding) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 4,000,085	$ 3,916,326
Percentage of Subtotal	100.00%	100.00%
Less: Allowance for loan losses	$ (50,564)	$ (48,453)	$ (49,562)	$ (47,706)	$ (45,627)	$ (47,121)
Net deferred loan fees	(1,467)	(1,581)
Loans, net	3,948,054	3,866,292
Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 3,524,398	$ 3,441,184
Percentage of Total commercial loans	88.10%	87.90%
Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 86,996	$ 86,064
Consumer loan open-ended revolving line
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 475,687	$ 475,142
Working Capital Lines of Credit Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Total consumer loans	11.90%	12.10%
Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: Allowance for loan losses	$ (25,024)	$ (22,518)	(24,030)	(22,524)	(20,725)	(21,097)
Commercial and Industrial Loans | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 1,450,325	$ 1,405,379
Percentage of Total commercial loans	36.20%	35.90%
Commercial and Industrial Loans | Working Capital Lines of Credit Loans | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 755,090	$ 690,620
Percentage of Total commercial loans	18.90%	17.60%
Commercial and Industrial Loans | Non-working Capital Loans | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 695,235	$ 714,759
Percentage of Total commercial loans	17.30%	18.30%
Commercial Real Estate and Multi-family Residential Loans | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 1,655,511	$ 1,569,635
Percentage of Total commercial loans	41.40%	40.10%
Commercial Real Estate and Multi-family Residential Loans | Construction and Land Development Loans | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 321,550	$ 266,805
Percentage of Total commercial loans	8.00%	6.80%
Commercial Real Estate and Multi-family Residential Loans | Owner Occupied Loans | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 557,115	$ 586,325
Percentage of Total commercial loans	13.90%	15.00%
Commercial Real Estate and Multi-family Residential Loans | Nonowner Occupied Loans | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 533,880	$ 520,901
Percentage of Total commercial loans	13.40%	13.30%
Commercial Real Estate and Multi-family Residential Loans | Multifamily Loans | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 242,966	$ 195,604
Percentage of Total commercial loans	6.10%	5.00%
Agri-business and Agricultural Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: Allowance for loan losses	$ (3,906)	$ (4,305)	$ (4,146)	$ (4,585)	$ (4,848)	$ (4,920)
Agri-business and Agricultural Loans | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 314,478	$ 370,513
Percentage of Total commercial loans	7.90%	9.50%
Agri-business and Agricultural Loans | Loans Secured By Farmland | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 148,883	$ 177,503
Percentage of Total commercial loans	3.70%	4.60%
Agri-business and Agricultural Loans | Loans For Agricultural Production | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 165,595	$ 193,010
Percentage of Total commercial loans	4.20%	4.90%
Other Commercial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Total consumer loans	2.20%	2.20%
Other Commercial Loans | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 104,084	$ 95,657
Percentage of Total commercial loans	2.60%	2.40%
Total Consumer 1 To 4 Family Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 388,691	$ 389,078
Percentage of Total commercial loans	9.70%	9.90%
Total Consumer 1 To 4 Family Mortgage Loans | Closed End First Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 187,863	$ 185,822
Percentage of Total commercial loans	4.70%	4.70%
Total Consumer 1 To 4 Family Mortgage Loans | Open End And Junior Lien Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 188,558	$ 187,030
Percentage of Total commercial loans	4.70%	4.80%
Total Consumer 1 To 4 Family Mortgage Loans | Residential Construction and Land Development Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial And Consumer Loans	$ 12,270	$ 16,226
Percentage of Total commercial loans	0.30%	0.40%

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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