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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Accounts, Notes, Loans and Financing Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Loans Receivable weighted average interest rate	4.34%	4.29%
Allowance for credit losses
Loans Receivable	$ (66,602)	$ (55,743)
Undisbursed portion of loans in process
Loans Receivable	(879,617)	(863,722)
Deferred loan fees and gains, net
Loans Receivable	(10,779)	(9,260)
Loans Receivable
Loans Receivable	4,214,267	4,296,804
Commercial construction
Loans Receivable	1,192,342	1,212,837
Commercial Real Estate
Loans Receivable	1,605,663	1,553,677
Industrial revenue bonds
Loans Receivable	14,439	14,003
Consumer auto
Loans Receivable	63,625	86,173
Home Equity Line of Credit
Loans Receivable	114,616	114,689
Loans Receivable, Gross
Loans Receivable	5,171,265	5,225,529
Land development
Loans Receivable	52,907	54,010
One- to four-family residential construction
Loans Receivable	46,943	42,793
Subdivision construction
Loans Receivable	7,771	30,894
Owner occupied one- to four-family residential
Loans Receivable	547,503	470,436
Non-owner occupied one- to four-family residential
Loans Receivable	133,197	114,569
Other residential
Loans Receivable	1,045,647	1,021,145
Commercial business
Loans Receivable	307,539	370,898
Consumer
Loans Receivable	$ 39,073	40,762
Acquired Loans Net of Discount
Loans Receivable		$ 98,643

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