Loans and Allowance for Credit Losses - Schedule of Loans Classified by Aging Analysis (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Commercial construction
Financing Receivables, By Class	$ 0
Commercial Real Estate
Financing Receivables, By Class	0
Industrial revenue bonds
Financing Receivables, By Class	0
Consumer auto
Financing Receivables, By Class	0
Home Equity Line of Credit
Financing Receivables, By Class	0
Land development
Financing Receivables, By Class	0
One- to four-family residential construction
Financing Receivables, By Class	0
Subdivision construction
Financing Receivables, By Class	0
Owner occupied one- to four-family residential
Financing Receivables, By Class	0
Non-owner occupied one- to four-family residential
Financing Receivables, By Class	0
Other residential
Financing Receivables, By Class	0
Commercial business
Financing Receivables, By Class	0
Consumer
Financing Receivables, By Class	0
FDIC-assisted acquired loans included above
Financing Receivables, By Class	0
Loans Receivable, Gross
Financing Receivables, By Class	0
Financial Asset, 30 to 59 Days Past Due | Commercial construction
Financing Receivables, By Class	0
Financial Asset, 30 to 59 Days Past Due | Commercial Real Estate
Financing Receivables, By Class	0
Financial Asset, 30 to 59 Days Past Due | Industrial revenue bonds
Financing Receivables, By Class	0
Financial Asset, 30 to 59 Days Past Due | Consumer auto
Financing Receivables, By Class	229	$ 364
Financial Asset, 30 to 59 Days Past Due | Home Equity Line of Credit
Financing Receivables, By Class	0	153
Financial Asset, 30 to 59 Days Past Due | Land development
Financing Receivables, By Class	29	20
Financial Asset, 30 to 59 Days Past Due | One- to four-family residential construction
Financing Receivables, By Class	0	1,365
Financial Asset, 30 to 59 Days Past Due | Subdivision construction
Financing Receivables, By Class	0
Financial Asset, 30 to 59 Days Past Due | Owner occupied one- to four-family residential
Financing Receivables, By Class	843	1,379
Financial Asset, 30 to 59 Days Past Due | Non-owner occupied one- to four-family residential
Financing Receivables, By Class	0
Financial Asset, 30 to 59 Days Past Due | Other residential
Financing Receivables, By Class	0
Financial Asset, 30 to 59 Days Past Due | Commercial business
Financing Receivables, By Class	1,404
Financial Asset, 30 to 59 Days Past Due | Consumer
Financing Receivables, By Class	126	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		1,662
Financial Asset, 30 to 59 Days Past Due | Loans Receivable, Gross
Financing Receivables, By Class	2,631	5,386
Financial Asset, 30 to 59 Days Past Due | Loans Receivable
Financing Receivables, By Class		3,724
Financial Asset, 60 to 89 Days Past Due | Commercial construction
Financing Receivables, By Class	0
Financial Asset, 60 to 89 Days Past Due | Commercial Real Estate
Financing Receivables, By Class	0	79
Financial Asset, 60 to 89 Days Past Due | Industrial revenue bonds
Financing Receivables, By Class	0
Financial Asset, 60 to 89 Days Past Due | Consumer auto
Financing Receivables, By Class	31	119
Financial Asset, 60 to 89 Days Past Due | Home Equity Line of Credit
Financing Receivables, By Class	0	111
Financial Asset, 60 to 89 Days Past Due | Land development
Financing Receivables, By Class	15
Financial Asset, 60 to 89 Days Past Due | One- to four-family residential construction
Financing Receivables, By Class	0
Financial Asset, 60 to 89 Days Past Due | Subdivision construction
Financing Receivables, By Class	0
Financial Asset, 60 to 89 Days Past Due | Owner occupied one- to four-family residential
Financing Receivables, By Class	2	113
Financial Asset, 60 to 89 Days Past Due | Non-owner occupied one- to four-family residential
Financing Receivables, By Class	0
Financial Asset, 60 to 89 Days Past Due | Other residential
Financing Receivables, By Class	0
Financial Asset, 60 to 89 Days Past Due | Commercial business
Financing Receivables, By Class	0
Financial Asset, 60 to 89 Days Past Due | Consumer
Financing Receivables, By Class	28	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		641
Financial Asset, 60 to 89 Days Past Due | FDIC-assisted acquired loans included above
Financing Receivables, By Class	0
Financial Asset, 60 to 89 Days Past Due | Loans Receivable, Gross
Financing Receivables, By Class	76	1,070
Financial Asset, 60 to 89 Days Past Due | Loans Receivable
Financing Receivables, By Class		429
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial construction
Financing Receivables, By Class	0
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial Real Estate
Financing Receivables, By Class	2,006	587
Financial Asset, Equal to or Greater than 90 Days Past Due | Industrial revenue bonds
Financing Receivables, By Class	0
Financial Asset, Equal to or Greater than 90 Days Past Due | Consumer auto
Financing Receivables, By Class	34	169
Financial Asset, Equal to or Greater than 90 Days Past Due | Home Equity Line of Credit
Financing Receivables, By Class	636	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 | One- to four-family residential construction
Financing Receivables, By Class	0
Financial Asset, Equal to or Greater than 90 Days Past Due | Subdivision construction
Financing Receivables, By Class	0
Financial Asset, Equal to or Greater than 90 Days Past Due | Owner occupied one- to four-family residential
Financing Receivables, By Class	2,216	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	0	69
Financial Asset, Equal to or Greater than 90 Days Past Due | Other residential
Financing Receivables, By Class	0
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial business
Financing Receivables, By Class	0	114
Financial Asset, Equal to or Greater than 90 Days Past Due | Consumer
Financing Receivables, By Class	63	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		3,843
Financial Asset, Equal to or Greater than 90 Days Past Due | Loans Receivable, Gross
Financing Receivables, By Class	5,423	6,886
Financial Asset, Equal to or Greater than 90 Days Past Due | Loans Receivable
Financing Receivables, By Class		3,043
Financing Receivables Past Due | Commercial construction
Financing Receivables, By Class	0
Financing Receivables Past Due | Commercial Real Estate
Financing Receivables, By Class	2,006	666
Financing Receivables Past Due | Industrial revenue bonds
Financing Receivables, By Class	0
Financing Receivables Past Due | Consumer auto
Financing Receivables, By Class	294	652
Financing Receivables Past Due | Home Equity Line of Credit
Financing Receivables, By Class	636	772
Financing Receivables Past Due | Land development
Financing Receivables, By Class	512	20
Financing Receivables Past Due | One- to four-family residential construction
Financing Receivables, By Class	0	1,365
Financing Receivables Past Due | Subdivision construction
Financing Receivables, By Class	0
Financing Receivables Past Due | Owner occupied one- to four-family residential
Financing Receivables, By Class	3,061	2,994
Financing Receivables Past Due | Non-owner occupied one- to four-family residential
Financing Receivables, By Class	0	69
Financing Receivables Past Due | Other residential
Financing Receivables, By Class	0
Financing Receivables Past Due | Commercial business
Financing Receivables, By Class	1,404	114
Financing Receivables Past Due | Consumer
Financing Receivables, By Class	217	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		6,146
Financing Receivables Past Due | Loans Receivable, Gross
Financing Receivables, By Class	8,130	13,342
Financing Receivables Past Due | Loans Receivable
Financing Receivables, By Class		7,196
Financing Receivables Current | Commercial construction
Financing Receivables, By Class	617,505	484,372
Financing Receivables Current | Commercial Real Estate
Financing Receivables, By Class	1,474,224	1,540,576
Financing Receivables Current | Industrial revenue bonds
Financing Receivables, By Class	14,203	14,003
Financing Receivables Current | Consumer auto
Financing Receivables, By Class	48,621	85,521
Financing Receivables Current | Home Equity Line of Credit
Financing Receivables, By Class	119,329	113,917
Financing Receivables Current | Land development
Financing Receivables, By Class	47,315	53,990
Financing Receivables Current | One- to four-family residential construction
Financing Receivables, By Class	28,302	19,353
Financing Receivables Current | Subdivision construction
Financing Receivables, By Class	26,694	4,917
Financing Receivables Current | Owner occupied one- to four-family residential
Financing Receivables, By Class	558,897	467,316
Financing Receivables Current | Non-owner occupied one- to four-family residential
Financing Receivables, By Class	119,635	114,429
Financing Receivables Current | Other residential
Financing Receivables, By Class	697,903	999,447
Financing Receivables Current | Commercial business
Financing Receivables, By Class	279,109	317,909
Financing Receivables Current | Consumer
Financing Receivables, By Class	37,685	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		92,497
Financing Receivables Current | FDIC-assisted acquired loans included above
Financing Receivables, By Class	72,001
Financing Receivables Current | Loans Receivable, Gross
Financing Receivables, By Class	4,069,422	4,348,465
Financing Receivables Current | Loans Receivable
Financing Receivables, By Class		4,255,968
Financing Receivables Total | Commercial construction
Financing Receivables, By Class	617,505	484,372
Financing Receivables Total | Commercial Real Estate
Financing Receivables, By Class	1,476,230	1,541,242
Financing Receivables Total | Industrial revenue bonds
Financing Receivables, By Class	14,203	14,003
Financing Receivables Total | Consumer auto
Financing Receivables, By Class	48,915	86,173
Financing Receivables Total | Home Equity Line of Credit
Financing Receivables, By Class	119,965	114,689
Financing Receivables Total | Land development
Financing Receivables, By Class	47,827	54,010
Financing Receivables Total | One- to four-family residential construction
Financing Receivables, By Class	28,302	20,718
Financing Receivables Total | Subdivision construction
Financing Receivables, By Class	26,694	4,917
Financing Receivables Total | Owner occupied one- to four-family residential
Financing Receivables, By Class	561,958	470,310
Financing Receivables Total | Non-owner occupied one- to four-family residential
Financing Receivables, By Class	119,635	114,498
Financing Receivables Total | Other residential
Financing Receivables, By Class	697,903	999,447
Financing Receivables Total | Commercial business
Financing Receivables, By Class	280,513	318,023
Financing Receivables Total | Consumer
Financing Receivables, By Class	37,902	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		98,643
Financing Receivables Total | FDIC-assisted acquired loans included above
Financing Receivables, By Class	74,170
Financing Receivables Total | Loans Receivable, Gross
Financing Receivables, By Class	$ 4,077,552	4,361,807
Financing Receivables Total | Loans Receivable
Financing Receivables, By Class		$ 4,263,164