Loans and Allowance for Credit Losses - Loans by Credit Risk Rating, Segregated by Class of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 16,142,124	$ 12,012,503
Loans other than pass or current
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	3,788,551	2,516,672
Fiscal year before current fiscal year	2,387,165	1,525,310
Two years before current fiscal year	1,385,727	709,683
Three years before current fiscal year	475,113	656,367
Four years before current fiscal year	449,978	801,918
Five years before current fiscal year	995,490	1,081,384
Lines of Credit (“LOC”) Amortized Cost Basis	6,608,013	4,431,020
LOC Converted to Term Loans Amortized Cost Basis	52,087	290,149
Total	16,142,124	12,012,503
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total	349,810	355,370
Consumer | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Total	196,928	187,052
Consumer | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total	152,882	168,318
Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	12,581,262	9,167,250
Real Estate | Construction and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,566,649	1,326,371
Real Estate | Construction and development | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	237,304	74,813
Fiscal year before current fiscal year	68,916	83,729
Two years before current fiscal year	50,912	28,803
Three years before current fiscal year	16,920	17,349
Four years before current fiscal year	13,625	8,505
Five years before current fiscal year	9,611	9,319
Lines of Credit (“LOC”) Amortized Cost Basis	2,163,776	1,074,617
LOC Converted to Term Loans Amortized Cost Basis	334	20,285
Total	2,561,398	1,317,420
Real Estate | Construction and development | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	270
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Five years before current fiscal year	41	47
Lines of Credit (“LOC”) Amortized Cost Basis	1,342	0
LOC Converted to Term Loans Amortized Cost Basis	0	0
Total	1,383	317
Real Estate | Construction and development | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	1,091	191
Fiscal year before current fiscal year	116	77
Two years before current fiscal year	36	16
Three years before current fiscal year	13	54
Four years before current fiscal year	31	324
Five years before current fiscal year	103	423
Lines of Credit (“LOC”) Amortized Cost Basis	2,478	5,598
LOC Converted to Term Loans Amortized Cost Basis	0	1,951
Total	3,868	8,634
Real Estate | Construction and development | Doubtful and loss
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Five years before current fiscal year	0	0
Lines of Credit (“LOC”) Amortized Cost Basis	0	0
LOC Converted to Term Loans Amortized Cost Basis	0	0
Total	0	0
Real Estate | Construction and development | Risk rate 5, 6, and 7
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	238,395	75,004
Fiscal year before current fiscal year	69,032	83,806
Two years before current fiscal year	50,948	29,089
Three years before current fiscal year	16,933	17,403
Four years before current fiscal year	13,656	8,829
Five years before current fiscal year	9,755	9,789
Lines of Credit (“LOC”) Amortized Cost Basis	2,167,596	1,080,215
LOC Converted to Term Loans Amortized Cost Basis	334	22,236
Total	2,566,649	1,326,371
Real Estate | Single family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,546,115	2,101,975
Real Estate | Other commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	7,468,498	5,738,904
Real Estate | Other commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	1,917,352	1,349,746
Fiscal year before current fiscal year	1,482,049	807,701
Two years before current fiscal year	768,630	375,824
Three years before current fiscal year	254,986	267,696
Four years before current fiscal year	179,729	476,029
Five years before current fiscal year	428,027	537,493
Lines of Credit (“LOC”) Amortized Cost Basis	2,093,379	1,409,099
LOC Converted to Term Loans Amortized Cost Basis	19,469	164,856
Total	7,143,621	5,388,444
Real Estate | Other commercial | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	19,538	28,151
Fiscal year before current fiscal year	32,831	30,981
Two years before current fiscal year	38,821	2,799
Three years before current fiscal year	206	6,650
Four years before current fiscal year	2,261	39,361
Five years before current fiscal year	20,741	4,801
Lines of Credit (“LOC”) Amortized Cost Basis	104,431	38,638
LOC Converted to Term Loans Amortized Cost Basis	0	1,608
Total	218,829	152,989
Real Estate | Other commercial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	24,639	28,137
Fiscal year before current fiscal year	3,399	10,186
Two years before current fiscal year	27,399	5,243
Three years before current fiscal year	2,544	10,806
Four years before current fiscal year	2,026	30,060
Five years before current fiscal year	15,217	27,107
Lines of Credit (“LOC”) Amortized Cost Basis	30,824	53,860
LOC Converted to Term Loans Amortized Cost Basis	0	32,072
Total	106,048	197,471
Real Estate | Other commercial | Doubtful and loss
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Five years before current fiscal year	0	0
Lines of Credit (“LOC”) Amortized Cost Basis	0	0
LOC Converted to Term Loans Amortized Cost Basis	0	0
Total	0	0
Real Estate | Other commercial | Risk rate 5, 6, and 7
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	1,961,529	1,406,034
Fiscal year before current fiscal year	1,518,279	848,868
Two years before current fiscal year	834,850	383,866
Three years before current fiscal year	257,736	285,152
Four years before current fiscal year	184,016	545,450
Five years before current fiscal year	463,985	569,401
Lines of Credit (“LOC”) Amortized Cost Basis	2,228,634	1,501,597
LOC Converted to Term Loans Amortized Cost Basis	19,469	198,536
Total	7,468,498	5,738,904
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,837,913	2,160,760
Commercial | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,632,290	1,992,043
Commercial | Commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	595,256	455,499
Fiscal year before current fiscal year	300,650	187,517
Two years before current fiscal year	168,539	80,486
Three years before current fiscal year	41,924	57,437
Four years before current fiscal year	31,329	36,529
Five years before current fiscal year	35,447	57,099
Lines of Credit (“LOC”) Amortized Cost Basis	1,401,402	1,004,971
LOC Converted to Term Loans Amortized Cost Basis	24,940	41,885
Total	2,599,487	1,921,423
Commercial | Commercial | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	199	670
Fiscal year before current fiscal year	1,700	2,482
Two years before current fiscal year	11	1,066
Three years before current fiscal year	32	189
Four years before current fiscal year	0	261
Five years before current fiscal year	927	2,770
Lines of Credit (“LOC”) Amortized Cost Basis	2,708	8,500
LOC Converted to Term Loans Amortized Cost Basis	80	10,499
Total	5,657	26,437
Commercial | Commercial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	5,257	3,436
Fiscal year before current fiscal year	2,435	18,381
Two years before current fiscal year	3,328	4,397
Three years before current fiscal year	802	1,196
Four years before current fiscal year	891	578
Five years before current fiscal year	1,290	850
Lines of Credit (“LOC”) Amortized Cost Basis	11,337	8,242
LOC Converted to Term Loans Amortized Cost Basis	1,805	7,103
Total	27,145	44,183
Commercial | Commercial | Doubtful and loss
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Five years before current fiscal year	0	0
Lines of Credit (“LOC”) Amortized Cost Basis	0	0
LOC Converted to Term Loans Amortized Cost Basis	1	0
Total	1	0
Commercial | Commercial | Risk rate 5, 6, and 7
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	600,712	459,605
Fiscal year before current fiscal year	304,785	208,380
Two years before current fiscal year	171,878	85,949
Three years before current fiscal year	42,758	58,822
Four years before current fiscal year	32,220	37,368
Five years before current fiscal year	37,664	60,719
Lines of Credit (“LOC”) Amortized Cost Basis	1,415,447	1,021,713
LOC Converted to Term Loans Amortized Cost Basis	26,826	59,487
Total	2,632,290	1,992,043
Commercial | Agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total	205,623	168,717
Commercial | Agricultural | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	44,377	32,780
Fiscal year before current fiscal year	22,901	20,230
Two years before current fiscal year	12,044	10,253
Three years before current fiscal year	4,483	3,646
Four years before current fiscal year	1,029	2,364
Five years before current fiscal year	369	459
Lines of Credit (“LOC”) Amortized Cost Basis	119,342	98,245
LOC Converted to Term Loans Amortized Cost Basis	310	327
Total	204,855	168,304
Commercial | Agricultural | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	8	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Five years before current fiscal year	0	0
Lines of Credit (“LOC”) Amortized Cost Basis	0	0
LOC Converted to Term Loans Amortized Cost Basis	0	0
Total	8	0
Commercial | Agricultural | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	55	191
Fiscal year before current fiscal year	8	25
Two years before current fiscal year	78	27
Three years before current fiscal year	49	53
Four years before current fiscal year	10	22
Five years before current fiscal year	0	3
Lines of Credit (“LOC”) Amortized Cost Basis	560	23
LOC Converted to Term Loans Amortized Cost Basis	0	69
Total	760	413
Commercial | Agricultural | Doubtful and loss
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Five years before current fiscal year	0	0
Lines of Credit (“LOC”) Amortized Cost Basis	0	0
LOC Converted to Term Loans Amortized Cost Basis	0	0
Total	0	0
Commercial | Agricultural | Risk rate 5, 6, and 7
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	44,440	32,971
Fiscal year before current fiscal year	22,909	20,255
Two years before current fiscal year	12,122	10,280
Three years before current fiscal year	4,532	3,699
Four years before current fiscal year	1,039	2,386
Five years before current fiscal year	369	462
Lines of Credit (“LOC”) Amortized Cost Basis	119,902	98,268
LOC Converted to Term Loans Amortized Cost Basis	310	396
Total	205,623	168,717
Other
Financing Receivable, Credit Quality Indicator [Line Items]
Total	373,139	329,123
Current
Financing Receivable, Credit Quality Indicator [Line Items]
Total	16,076,822	11,958,874
Current | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total	347,038	352,831
Current | Consumer | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Five years before current fiscal year	0	0
Lines of Credit (“LOC”) Amortized Cost Basis	195,222	185,792
LOC Converted to Term Loans Amortized Cost Basis	0	0
Total	195,222	185,792
Current | Consumer | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	86,303	97,830
Fiscal year before current fiscal year	26,339	21,885
Two years before current fiscal year	10,071	11,712
Three years before current fiscal year	3,804	6,756
Four years before current fiscal year	2,671	5,416
Five years before current fiscal year	2,275	3,833
Lines of Credit (“LOC”) Amortized Cost Basis	20,350	19,607
LOC Converted to Term Loans Amortized Cost Basis	3	0
Total	151,816	167,039
Current | Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	12,531,583	9,131,179
Current | Real Estate | Construction and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,561,529	1,325,753
Current | Real Estate | Single family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	700,976	419,605
Fiscal year before current fiscal year	411,885	335,788
Two years before current fiscal year	295,365	185,190
Three years before current fiscal year	141,608	260,037
Four years before current fiscal year	192,176	193,110
Five years before current fiscal year	440,931	421,957
Lines of Credit (“LOC”) Amortized Cost Basis	324,282	256,155
LOC Converted to Term Loans Amortized Cost Basis	4,192	9,422
Total	2,511,415	2,081,264
Current | Real Estate | Other commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	7,458,639	5,724,162
Current | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,825,126	2,145,744
Current | Commercial | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,619,681	1,977,157
Current | Commercial | Agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total	205,445	168,587
Current | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	152,086	24,247
Fiscal year before current fiscal year	29,362	4,740
Two years before current fiscal year	8,181	1,236
Three years before current fiscal year	4,742	22,438
Four years before current fiscal year	20,018	6,692
Five years before current fiscal year	25,349	5,578
Lines of Credit (“LOC”) Amortized Cost Basis	132,384	264,189
LOC Converted to Term Loans Amortized Cost Basis	953	0
Total	373,075	329,120
30-89 days past due | Consumer | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Five years before current fiscal year	0	0
Lines of Credit (“LOC”) Amortized Cost Basis	1,297	847
LOC Converted to Term Loans Amortized Cost Basis	0	0
Total	1,297	847
30-89 days past due | Consumer | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	298	265
Fiscal year before current fiscal year	241	121
Two years before current fiscal year	135	164
Three years before current fiscal year	13	49
Four years before current fiscal year	34	219
Five years before current fiscal year	119	156
Lines of Credit (“LOC”) Amortized Cost Basis	12	175
LOC Converted to Term Loans Amortized Cost Basis	0	0
Total	852	1,149
30-89 days past due | Real Estate | Single family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	3,105	1,061
Fiscal year before current fiscal year	3,415	883
Two years before current fiscal year	1,290	1,662
Three years before current fiscal year	2,018	791
Four years before current fiscal year	3,129	1,077
Five years before current fiscal year	8,626	4,360
Lines of Credit (“LOC”) Amortized Cost Basis	2,042	1,479
LOC Converted to Term Loans Amortized Cost Basis		0
Total	23,625	11,313
30-89 days past due | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Five years before current fiscal year	61	0
Lines of Credit (“LOC”) Amortized Cost Basis	0	0
LOC Converted to Term Loans Amortized Cost Basis	0	0
Total	61	0
90+ days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Total	26,886	32,907
90+ days past due | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total	623	543
90+ days past due | Consumer | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Five years before current fiscal year	0	0
Lines of Credit (“LOC”) Amortized Cost Basis	409	413
LOC Converted to Term Loans Amortized Cost Basis	0	0
Total	409	413
90+ days past due | Consumer | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	121	23
Fiscal year before current fiscal year	47	23
Two years before current fiscal year	2	28
Three years before current fiscal year	1	21
Four years before current fiscal year	2	13
Five years before current fiscal year	41	22
Lines of Credit (“LOC”) Amortized Cost Basis	0	0
LOC Converted to Term Loans Amortized Cost Basis	0	0
Total	214	130
90+ days past due | Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	18,618	22,170
90+ days past due | Real Estate | Construction and development
Financing Receivable, Credit Quality Indicator [Line Items]
Total	443	504
90+ days past due | Real Estate | Single family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	586	27
Fiscal year before current fiscal year	871	561
Two years before current fiscal year	885	507
Three years before current fiscal year	968	1,199
Four years before current fiscal year	1,017	1,358
Five years before current fiscal year	6,312	5,104
Lines of Credit (“LOC”) Amortized Cost Basis	436	570
LOC Converted to Term Loans Amortized Cost Basis		72
Total	11,075	9,398
90+ days past due | Real Estate | Other commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	7,100	12,268
90+ days past due | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	7,642	10,191
90+ days past due | Commercial | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	7,575	10,074
90+ days past due | Commercial | Agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total	67	117
90+ days past due | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Five years before current fiscal year	3	3
Lines of Credit (“LOC”) Amortized Cost Basis	0	0
LOC Converted to Term Loans Amortized Cost Basis	0	0
Total	3	3
30 + days past due | Consumer | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Five years before current fiscal year	0	0
Lines of Credit (“LOC”) Amortized Cost Basis	196,928	187,052
LOC Converted to Term Loans Amortized Cost Basis	0	0
Total	196,928	187,052
30 + days past due | Consumer | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	86,722	98,118
Fiscal year before current fiscal year	26,627	22,029
Two years before current fiscal year	10,208	11,904
Three years before current fiscal year	3,818	6,826
Four years before current fiscal year	2,707	5,648
Five years before current fiscal year	2,435	4,011
Lines of Credit (“LOC”) Amortized Cost Basis	20,362	19,782
LOC Converted to Term Loans Amortized Cost Basis	3	0
Total	152,882	168,318
30 + days past due | Real Estate | Single family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	704,667	420,693
Fiscal year before current fiscal year	416,171	337,232
Two years before current fiscal year	297,540	187,359
Three years before current fiscal year	144,594	262,027
Four years before current fiscal year	196,322	195,545
Five years before current fiscal year	455,869	431,421
Lines of Credit (“LOC”) Amortized Cost Basis	326,760	258,204
LOC Converted to Term Loans Amortized Cost Basis	4,192	9,494
Total	2,546,115	2,101,975
30 + days past due | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	152,086	24,247
Fiscal year before current fiscal year	29,362	4,740
Two years before current fiscal year	8,181	1,236
Three years before current fiscal year	4,742	22,438
Four years before current fiscal year	20,018	6,692
Five years before current fiscal year	25,413	5,581
Lines of Credit (“LOC”) Amortized Cost Basis	132,384	264,189
LOC Converted to Term Loans Amortized Cost Basis	953	0
Total	$ 373,139	$ 329,123