LOANS - Total Loans Outstanding (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 4,291,105	$ 4,657,183
Less: Allowance for credit losses	(67,773)	(61,408)	$ (50,652)	$ (48,453)
Net deferred loan fees	(3,264)	(8,027)
Loans, net	4,220,068	4,587,748
Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	3,863,630	4,210,049
Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	427,475	447,134
Other consumer loans | Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	82,755	103,616
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: Allowance for credit losses		(28,333)
Commercial and Industrial | Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,389,469	1,791,378
Less: Allowance for credit losses	(30,595)	(28,333)	(25,789)	(22,518)
Commercial and Industrial | Working capital lines of credit loans | Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	652,861	626,023
Commercial and Industrial | Non-working capital loans | Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	736,608	1,165,355
Commercial real estate and multi-family residential loans | Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,954,846	1,895,014
Commercial real estate and multi-family residential loans | Construction and land development loans | Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	379,813	362,653
Commercial real estate and multi-family residential loans | Owner occupied loans | Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	739,371	648,019
Commercial real estate and multi-family residential loans | Nonowner occupied loans | Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	588,458	579,625
Commercial real estate and multi-family residential loans | Multi-family loans | Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	247,204	304,717
Agri-business and Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: Allowance for credit losses		(3,043)
Agri-business and Agricultural | Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	445,825	429,644
Less: Allowance for credit losses	(5,034)	(3,043)	$ (3,869)	$ (4,305)
Agri-business and Agricultural | Loans secured by farmland | Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	206,331	195,410
Agri-business and Agricultural | Loans for agricultural production | Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	239,494	234,234
Other commercial loans | Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	73,490	94,013
Consumer 1-4 Family Mortgage | Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	344,720	343,518
Consumer 1-4 Family Mortgage | Closed end first mortgage loans | Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	176,561	167,847
Consumer 1-4 Family Mortgage | Open end and junior lien loans | Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	156,238	163,664
Consumer 1-4 Family Mortgage | Residential construction and land development loans | Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 11,921	$ 12,007