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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Loans Classified by Aging Analysis (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financial Asset, 30 to 59 Days Past Due | Consumer auto
Financing Receivables, By Class	$ 306	$ 364
Financial Asset, 30 to 59 Days Past Due | Home Equity Line of Credit
Financing Receivables, By Class		153
Financial Asset, 30 to 59 Days Past Due | Land development
Financing Receivables, By Class	16	20
Financial Asset, 30 to 59 Days Past Due | One- to four-family residential construction
Financing Receivables, By Class	1	1,365
Financial Asset, 30 to 59 Days Past Due | Owner occupied one- to four-family residential
Financing Receivables, By Class	223	1,379
Financial Asset, 30 to 59 Days Past Due | Commercial business
Financing Receivables, By Class	114
Financial Asset, 30 to 59 Days Past Due | Consumer
Financing Receivables, By Class	188	443
Financial Asset, 30 to 59 Days Past Due | Acquired Loans Net of Discount
Financing Receivables, By Class		1,662
Financial Asset, 30 to 59 Days Past Due | Less Acquired Loans Net of Discount
Financing Receivables, By Class	218	1,662
Financial Asset, 30 to 59 Days Past Due | Loans Receivable, Gross
Financing Receivables, By Class	848	5,386
Financial Asset, 30 to 59 Days Past Due | Loans Receivable
Financing Receivables, By Class	630	3,724
Financial Asset, 60 to 89 Days Past Due | Commercial Real Estate
Financing Receivables, By Class		79
Financial Asset, 60 to 89 Days Past Due | Consumer auto
Financing Receivables, By Class	45	119
Financial Asset, 60 to 89 Days Past Due | Home Equity Line of Credit
Financing Receivables, By Class	39	111
Financial Asset, 60 to 89 Days Past Due | Owner occupied one- to four-family residential
Financing Receivables, By Class	49	113
Financial Asset, 60 to 89 Days Past Due | Consumer
Financing Receivables, By Class	19	7
Financial Asset, 60 to 89 Days Past Due | Acquired Loans Net of Discount
Financing Receivables, By Class		641
Financial Asset, 60 to 89 Days Past Due | Less Acquired Loans Net of Discount
Financing Receivables, By Class	41	641
Financial Asset, 60 to 89 Days Past Due | Loans Receivable, Gross
Financing Receivables, By Class	152	1,070
Financial Asset, 60 to 89 Days Past Due | Loans Receivable
Financing Receivables, By Class	111	429
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial Real Estate
Financing Receivables, By Class	2,598	587
Financial Asset, Equal to or Greater than 90 Days Past Due | Consumer auto
Financing Receivables, By Class	58	169
Financial Asset, Equal to or Greater than 90 Days Past Due | Home Equity Line of Credit
Financing Receivables, By Class	669	508
Financial Asset, Equal to or Greater than 90 Days Past Due | Land development
Financing Receivables, By Class	468
Financial Asset, Equal to or Greater than 90 Days Past Due | Owner occupied one- to four-family residential
Financing Receivables, By Class	2,946	1,502
Financial Asset, Equal to or Greater than 90 Days Past Due | Non-owner occupied one- to four-family residential
Financing Receivables, By Class	59	69
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial business
Financing Receivables, By Class	111	114
Financial Asset, Equal to or Greater than 90 Days Past Due | Consumer
Financing Receivables, By Class	72	94
Financial Asset, Equal to or Greater than 90 Days Past Due | Acquired Loans Net of Discount
Financing Receivables, By Class		3,843
Financial Asset, Equal to or Greater than 90 Days Past Due | Less Acquired Loans Net of Discount
Financing Receivables, By Class	1,938	3,843
Financial Asset, Equal to or Greater than 90 Days Past Due | Loans Receivable, Gross
Financing Receivables, By Class	6,981	6,886
Financial Asset, Equal to or Greater than 90 Days Past Due | Loans Receivable
Financing Receivables, By Class	5,043	3,043
Financing Receivables Past Due | Commercial Real Estate
Financing Receivables, By Class	2,598	666
Financing Receivables Past Due | Consumer auto
Financing Receivables, By Class	409	652
Financing Receivables Past Due | Home Equity Line of Credit
Financing Receivables, By Class	708	772
Financing Receivables Past Due | Land development
Financing Receivables, By Class	484	20
Financing Receivables Past Due | One- to four-family residential construction
Financing Receivables, By Class	1	1,365
Financing Receivables Past Due | Owner occupied one- to four-family residential
Financing Receivables, By Class	3,218	2,994
Financing Receivables Past Due | Non-owner occupied one- to four-family residential
Financing Receivables, By Class	59	69
Financing Receivables Past Due | Commercial business
Financing Receivables, By Class	225	114
Financing Receivables Past Due | Consumer
Financing Receivables, By Class	279	544
Financing Receivables Past Due | Acquired Loans Net of Discount
Financing Receivables, By Class		6,146
Financing Receivables Past Due | Less Acquired Loans Net of Discount
Financing Receivables, By Class	2,197	6,146
Financing Receivables Past Due | Loans Receivable, Gross
Financing Receivables, By Class	7,981	13,342
Financing Receivables Past Due | Loans Receivable
Financing Receivables, By Class	5,784	7,196
Financing Receivables Current | Commercial construction
Financing Receivables, By Class	1,371,227	1,212,837
Financing Receivables Current | Commercial Real Estate
Financing Receivables, By Class	1,525,827	1,553,011
Financing Receivables Current | Industrial revenue bonds
Financing Receivables, By Class	14,369	14,003
Financing Receivables Current | Consumer auto
Financing Receivables, By Class	54,885	85,521
Financing Receivables Current | Home Equity Line of Credit
Financing Receivables, By Class	117,269	113,917
Financing Receivables Current | Land development
Financing Receivables, By Class	47,373	53,990
Financing Receivables Current | One- to four-family residential construction
Financing Receivables, By Class	47,316	41,428
Financing Receivables Current | Subdivision construction
Financing Receivables, By Class	9,532	30,894
Financing Receivables Current | Owner occupied one- to four-family residential
Financing Receivables, By Class	551,668	467,442
Financing Receivables Current | Non-owner occupied one- to four-family residential
Financing Receivables, By Class	120,216	114,500
Financing Receivables Current | Other residential
Financing Receivables, By Class	794,572	1,021,145
Financing Receivables Current | Commercial business
Financing Receivables, By Class	295,471	370,784
Financing Receivables Current | Consumer
Financing Receivables, By Class	38,733	40,218
Financing Receivables Current | Acquired Loans Net of Discount
Financing Receivables, By Class		92,497
Financing Receivables Current | Less Acquired Loans Net of Discount
Financing Receivables, By Class	77,336	92,497
Financing Receivables Current | Loans Receivable, Gross
Financing Receivables, By Class	4,988,458	5,212,187
Financing Receivables Current | Loans Receivable
Financing Receivables, By Class	4,911,122	5,119,690
Financing Receivables Total | Commercial construction
Financing Receivables, By Class	1,371,227	1,212,837
Financing Receivables Total | Commercial Real Estate
Financing Receivables, By Class	1,528,425	1,553,677
Financing Receivables Total | Industrial revenue bonds
Financing Receivables, By Class	14,369	14,003
Financing Receivables Total | Consumer auto
Financing Receivables, By Class	55,294	86,173
Financing Receivables Total | Home Equity Line of Credit
Financing Receivables, By Class	117,977	114,689
Financing Receivables Total | Land development
Financing Receivables, By Class	47,857	54,010
Financing Receivables Total | One- to four-family residential construction
Financing Receivables, By Class	47,317	42,793
Financing Receivables Total | Subdivision construction
Financing Receivables, By Class	9,532	30,894
Financing Receivables Total | Owner occupied one- to four-family residential
Financing Receivables, By Class	554,886	470,436
Financing Receivables Total | Non-owner occupied one- to four-family residential
Financing Receivables, By Class	120,275	114,569
Financing Receivables Total | Other residential
Financing Receivables, By Class	794,572	1,021,145
Financing Receivables Total | Commercial business
Financing Receivables, By Class	295,696	370,898
Financing Receivables Total | Consumer
Financing Receivables, By Class	39,012	40,762
Financing Receivables Total | Acquired Loans Net of Discount
Financing Receivables, By Class		98,643
Financing Receivables Total | Less Acquired Loans Net of Discount
Financing Receivables, By Class	79,533	98,643
Financing Receivables Total | Loans Receivable, Gross
Financing Receivables, By Class	4,996,439	5,225,529
Financing Receivables Total | Loans Receivable
Financing Receivables, By Class	$ 4,916,906	$ 5,126,886

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