Loans and Allowance for Credit Losses - Schedule of Loans Classified by Aging Analysis (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financial Asset, 30 to 59 Days Past Due | Commercial Real Estate
Financing Receivables, By Class	$ 38
Financial Asset, 30 to 59 Days Past Due | Consumer auto
Financing Receivables, By Class	125	$ 229
Financial Asset, 30 to 59 Days Past Due | Land development
Financing Receivables, By Class		29
Financial Asset, 30 to 59 Days Past Due | Owner occupied one- to four-family residential
Financing Receivables, By Class	1,268	843
Financial Asset, 30 to 59 Days Past Due | Commercial business
Financing Receivables, By Class	197	1,404
Financial Asset, 30 to 59 Days Past Due | Consumer
Financing Receivables, By Class	265	126
Financial Asset, 30 to 59 Days Past Due | Loans Receivable, Gross
Financing Receivables, By Class	1,893	2,631
Financial Asset, 60 to 89 Days Past Due | Consumer auto
Financing Receivables, By Class	11	31
Financial Asset, 60 to 89 Days Past Due | Land development
Financing Receivables, By Class		15
Financial Asset, 60 to 89 Days Past Due | Owner occupied one- to four-family residential
Financing Receivables, By Class	583	2
Financial Asset, 60 to 89 Days Past Due | Consumer
Financing Receivables, By Class	81	28
Financial Asset, 60 to 89 Days Past Due | Loans Receivable, Gross
Financing Receivables, By Class	675	76
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial Real Estate
Financing Receivables, By Class	1,773	2,006
Financial Asset, Equal to or Greater than 90 Days Past Due | Consumer auto
Financing Receivables, By Class	49	34
Financial Asset, Equal to or Greater than 90 Days Past Due | Home Equity Line of Credit
Financing Receivables, By Class	618	636
Financial Asset, Equal to or Greater than 90 Days Past Due | Land development
Financing Receivables, By Class	468	468
Financial Asset, Equal to or Greater than 90 Days Past Due | Owner occupied one- to four-family residential
Financing Receivables, By Class	2,004	2,216
Financial Asset, Equal to or Greater than 90 Days Past Due | Consumer
Financing Receivables, By Class	57	63
Financial Asset, Equal to or Greater than 90 Days Past Due | Loans Receivable, Gross
Financing Receivables, By Class	4,969	5,423
Financing Receivables Past Due | Commercial Real Estate
Financing Receivables, By Class	1,811	2,006
Financing Receivables Past Due | Consumer auto
Financing Receivables, By Class	185	294
Financing Receivables Past Due | Home Equity Line of Credit
Financing Receivables, By Class	618	636
Financing Receivables Past Due | Land development
Financing Receivables, By Class	468	512
Financing Receivables Past Due | Owner occupied one- to four-family residential
Financing Receivables, By Class	3,855	3,061
Financing Receivables Past Due | Commercial business
Financing Receivables, By Class	197	1,404
Financing Receivables Past Due | Consumer
Financing Receivables, By Class	403	217
Financing Receivables Past Due | Loans Receivable, Gross
Financing Receivables, By Class	7,537	8,130
Financing Receivables Current | Commercial construction
Financing Receivables, By Class	438,424	617,505
Financing Receivables Current | Commercial Real Estate
Financing Receivables, By Class	1,556,660	1,474,224
Financing Receivables Current | Industrial revenue bonds
Financing Receivables, By Class	13,569	14,203
Financing Receivables Current | Consumer auto
Financing Receivables, By Class	44,884	48,621
Financing Receivables Current | Home Equity Line of Credit
Financing Receivables, By Class	113,866	119,329
Financing Receivables Current | Land development
Financing Receivables, By Class	46,321	47,315
Financing Receivables Current | One- to four-family residential construction
Financing Receivables, By Class	26,840	28,302
Financing Receivables Current | Subdivision construction
Financing Receivables, By Class	27,187	26,694
Financing Receivables Current | Owner occupied one- to four-family residential
Financing Receivables, By Class	604,705	558,897
Financing Receivables Current | Non-owner occupied one- to four-family residential
Financing Receivables, By Class	123,816	119,635
Financing Receivables Current | Other residential
Financing Receivables, By Class	849,720	697,903
Financing Receivables Current | Commercial business
Financing Receivables, By Class	290,184	279,109
Financing Receivables Current | Consumer
Financing Receivables, By Class	37,561	37,685
Financing Receivables Current | Loans Receivable, Gross
Financing Receivables, By Class	4,173,737	4,069,422
Financing Receivables Total | Commercial construction
Financing Receivables, By Class	438,424	617,505
Financing Receivables Total | Commercial Real Estate
Financing Receivables, By Class	1,558,471	1,476,230
Financing Receivables Total | Industrial revenue bonds
Financing Receivables, By Class	13,569	14,203
Financing Receivables Total | Consumer auto
Financing Receivables, By Class	45,069	48,915
Financing Receivables Total | Home Equity Line of Credit
Financing Receivables, By Class	114,484	119,965
Financing Receivables Total | Land development
Financing Receivables, By Class	46,789	47,827
Financing Receivables Total | One- to four-family residential construction
Financing Receivables, By Class	26,840	28,302
Financing Receivables Total | Subdivision construction
Financing Receivables, By Class	27,187	26,694
Financing Receivables Total | Owner occupied one- to four-family residential
Financing Receivables, By Class	608,560	561,958
Financing Receivables Total | Non-owner occupied one- to four-family residential
Financing Receivables, By Class	123,816	119,635
Financing Receivables Total | Other residential
Financing Receivables, By Class	849,720	697,903
Financing Receivables Total | Commercial business
Financing Receivables, By Class	290,381	280,513
Financing Receivables Total | Consumer
Financing Receivables, By Class	37,964	37,902
Financing Receivables Total | Loans Receivable, Gross
Financing Receivables, By Class	$ 4,181,274	$ 4,077,552