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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Loans Classified by Aging Analysis (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financial Asset, 30 to 59 Days Past Due | Consumer auto
Financing Receivables, By Class	$ 232	$ 364
Financial Asset, 30 to 59 Days Past Due | Home Equity Line of Credit
Financing Receivables, By Class	284	153
Financial Asset, 30 to 59 Days Past Due | Land development
Financing Receivables, By Class		20
Financial Asset, 30 to 59 Days Past Due | One- to four-family residential construction
Financing Receivables, By Class		1,365
Financial Asset, 30 to 59 Days Past Due | Owner occupied one- to four-family residential
Financing Receivables, By Class	229	1,379
Financial Asset, 30 to 59 Days Past Due | Consumer
Financing Receivables, By Class	184	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	150	1,662
Financial Asset, 30 to 59 Days Past Due | Loans Receivable, Gross
Financing Receivables, By Class	929	5,386
Financial Asset, 30 to 59 Days Past Due | Loans Receivable
Financing Receivables, By Class	779	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	54	119
Financial Asset, 60 to 89 Days Past Due | Home Equity Line of Credit
Financing Receivables, By Class	22	111
Financial Asset, 60 to 89 Days Past Due | Owner occupied one- to four-family residential
Financing Receivables, By Class	203	113
Financial Asset, 60 to 89 Days Past Due | Consumer
Financing Receivables, By Class	43	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	75	641
Financial Asset, 60 to 89 Days Past Due | Loans Receivable, Gross
Financing Receivables, By Class	322	1,070
Financial Asset, 60 to 89 Days Past Due | Loans Receivable
Financing Receivables, By Class	247	429
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial Real Estate
Financing Receivables, By Class	3,308	587
Financial Asset, Equal to or Greater than 90 Days Past Due | Consumer auto
Financing Receivables, By Class	81	169
Financial Asset, Equal to or Greater than 90 Days Past Due | Home Equity Line of Credit
Financing Receivables, By Class	707	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	2,979	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	102	69
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial business
Financing Receivables, By Class	99	114
Financial Asset, Equal to or Greater than 90 Days Past Due | Consumer
Financing Receivables, By Class	81	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	2,439	3,843
Financial Asset, Equal to or Greater than 90 Days Past Due | Loans Receivable, Gross
Financing Receivables, By Class	7,825	6,886
Financial Asset, Equal to or Greater than 90 Days Past Due | Loans Receivable
Financing Receivables, By Class	5,386	3,043
Financing Receivables Past Due | Commercial Real Estate
Financing Receivables, By Class	3,308	666
Financing Receivables Past Due | Consumer auto
Financing Receivables, By Class	367	652
Financing Receivables Past Due | Home Equity Line of Credit
Financing Receivables, By Class	1,013	772
Financing Receivables Past Due | Land development
Financing Receivables, By Class	468	20
Financing Receivables Past Due | One- to four-family residential construction
Financing Receivables, By Class		1,365
Financing Receivables Past Due | Owner occupied one- to four-family residential
Financing Receivables, By Class	3,411	2,994
Financing Receivables Past Due | Non-owner occupied one- to four-family residential
Financing Receivables, By Class	102	69
Financing Receivables Past Due | Commercial business
Financing Receivables, By Class	99	114
Financing Receivables Past Due | Consumer
Financing Receivables, By Class	308	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	2,664	6,146
Financing Receivables Past Due | Loans Receivable, Gross
Financing Receivables, By Class	9,076	13,342
Financing Receivables Past Due | Loans Receivable
Financing Receivables, By Class	6,412	7,196
Financing Receivables Current | Commercial construction
Financing Receivables, By Class	1,192,342	1,212,837
Financing Receivables Current | Commercial Real Estate
Financing Receivables, By Class	1,602,355	1,553,011
Financing Receivables Current | Industrial revenue bonds
Financing Receivables, By Class	14,439	14,003
Financing Receivables Current | Consumer auto
Financing Receivables, By Class	63,258	85,521
Financing Receivables Current | Home Equity Line of Credit
Financing Receivables, By Class	113,603	113,917
Financing Receivables Current | Land development
Financing Receivables, By Class	52,439	53,990
Financing Receivables Current | One- to four-family residential construction
Financing Receivables, By Class	46,943	41,428
Financing Receivables Current | Subdivision construction
Financing Receivables, By Class	7,771	30,894
Financing Receivables Current | Owner occupied one- to four-family residential
Financing Receivables, By Class	544,092	467,442
Financing Receivables Current | Non-owner occupied one- to four-family residential
Financing Receivables, By Class	133,095	114,500
Financing Receivables Current | Other residential
Financing Receivables, By Class	1,045,647	1,021,145
Financing Receivables Current | Commercial business
Financing Receivables, By Class	307,440	370,784
Financing Receivables Current | Consumer
Financing Receivables, By Class	38,765	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	81,718	92,497
Financing Receivables Current | Loans Receivable, Gross
Financing Receivables, By Class	5,162,189	5,212,187
Financing Receivables Current | Loans Receivable
Financing Receivables, By Class	5,080,471	5,119,690
Financing Receivables Total | Commercial construction
Financing Receivables, By Class	1,192,342	1,212,837
Financing Receivables Total | Commercial Real Estate
Financing Receivables, By Class	1,605,663	1,553,677
Financing Receivables Total | Industrial revenue bonds
Financing Receivables, By Class	14,439	14,003
Financing Receivables Total | Consumer auto
Financing Receivables, By Class	63,625	86,173
Financing Receivables Total | Home Equity Line of Credit
Financing Receivables, By Class	114,616	114,689
Financing Receivables Total | Land development
Financing Receivables, By Class	52,907	54,010
Financing Receivables Total | One- to four-family residential construction
Financing Receivables, By Class	46,943	42,793
Financing Receivables Total | Subdivision construction
Financing Receivables, By Class	7,771	30,894
Financing Receivables Total | Owner occupied one- to four-family residential
Financing Receivables, By Class	547,503	470,436
Financing Receivables Total | Non-owner occupied one- to four-family residential
Financing Receivables, By Class	133,197	114,569
Financing Receivables Total | Other residential
Financing Receivables, By Class	1,045,647	1,021,145
Financing Receivables Total | Commercial business
Financing Receivables, By Class	307,539	370,898
Financing Receivables Total | Consumer
Financing Receivables, By Class	39,073	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	84,382	98,643
Financing Receivables Total | Loans Receivable, Gross
Financing Receivables, By Class	5,171,265	5,225,529
Financing Receivables Total | Loans Receivable
Financing Receivables, By Class	$ 5,086,883	$ 5,126,886

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