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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Accounts, Notes, Loans and Financing Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Loans Receivable weighted average interest rate	4.30%	4.29%
Allowance for credit losses
Loans Receivable	$ (63,629)	$ (55,743)
Undisbursed portion of loans in process
Loans Receivable	(898,005)	(863,722)
Deferred loan fees and gains, net
Loans Receivable	(9,119)	(9,260)
Loans Receivable
Loans Receivable	4,025,686	4,296,804
Commercial construction
Loans Receivable	1,371,227	1,212,837
Commercial Real Estate
Loans Receivable	1,528,425	1,553,677
Industrial revenue bonds
Loans Receivable	14,369	14,003
Consumer auto
Loans Receivable	55,294	86,173
Home Equity Line of Credit
Loans Receivable	117,977	114,689
Loans Receivable, Gross
Loans Receivable	4,996,439	5,225,529
Land development
Loans Receivable	47,857	54,010
One- to four-family residential construction
Loans Receivable	47,317	42,793
Subdivision construction
Loans Receivable	9,532	30,894
Owner occupied one- to four-family residential
Loans Receivable	554,886	470,436
Non-owner occupied one- to four-family residential
Loans Receivable	120,275	114,569
Other residential
Loans Receivable	794,572	1,021,145
Commercial business
Loans Receivable	295,696	370,898
Consumer
Loans Receivable	$ 39,012	40,762
Acquired Loans Net of Discount
Loans Receivable		$ 98,643

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