Loans Held for Investment - Internal Risk Grades (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Internal risk grades of non-covered loans
2022	$ 1,936,212
2021	2,330,570
2020	921,795
2019	446,184
2018	355,208
2017 and Prior	475,518
Revolving	843,220
Total loans with credit quality measures	7,308,707
Total	7,944,246	$ 7,879,904
Commercial real estate
Internal risk grades of non-covered loans
Total	3,313,911	3,042,729
Commercial real estate | Non-owner occupied
Internal risk grades of non-covered loans
Total	1,954,231	1,729,699
Commercial real estate | Non-owner occupied | Internal Grade 1-3 (Pass low risk)
Internal risk grades of non-covered loans
2022	47,140
2021	76,592
2020	20,521
2019	8,044
2018	4,779
2017 and Prior	8,142
Revolving	1
Total loans with credit quality measures	165,219
Commercial real estate | Non-owner occupied | Internal Grade 4-7 (Pass normal risk)
Internal risk grades of non-covered loans
2022	341,269
2021	339,862
2020	121,299
2019	80,514
2018	46,457
2017 and Prior	56,121
Revolving	47,443
Total loans with credit quality measures	1,032,965
Commercial real estate | Non-owner occupied | Internal Grade 8-11 (Pass high risk and watch)
Internal risk grades of non-covered loans
2022	82,184
2021	138,346
2020	182,165
2019	82,786
2018	67,328
2017 and Prior	83,882
Revolving	11,821
Total loans with credit quality measures	648,512
Commercial real estate | Non-owner occupied | Internal Grade 13 (Substandard accrual)
Internal risk grades of non-covered loans
2022	78,037
2021	14,543
2020	1,637
2019	8,133
2017 and Prior	3,546
Revolving	373
Total loans with credit quality measures	106,269
Commercial real estate | Non-owner occupied | Internal Grade 14 (Substandard non-accrual)
Internal risk grades of non-covered loans
2021	399
2017 and Prior	867
Total loans with credit quality measures	1,266
Commercial real estate | Owner occupied
Internal risk grades of non-covered loans
Total	1,359,680	1,313,030
Commercial real estate | Owner occupied | Internal Grade 1-3 (Pass low risk)
Internal risk grades of non-covered loans
2022	21,049
2021	113,747
2020	65,252
2019	22,938
2018	12,294
2017 and Prior	64,781
Revolving	5,977
Total loans with credit quality measures	306,038
Commercial real estate | Owner occupied | Internal Grade 4-7 (Pass normal risk)
Internal risk grades of non-covered loans
2022	162,232
2021	189,775
2020	87,189
2019	81,957
2018	88,019
2017 and Prior	61,081
Revolving	15,966
Total loans with credit quality measures	686,219
Commercial real estate | Owner occupied | Internal Grade 8-11 (Pass high risk and watch)
Internal risk grades of non-covered loans
2022	56,849
2021	66,290
2020	87,346
2019	29,326
2018	64,755
2017 and Prior	27,447
Revolving	3,200
Total loans with credit quality measures	335,213
Commercial real estate | Owner occupied | Internal Grade 13 (Substandard accrual)
Internal risk grades of non-covered loans
2022	4,143
2021	430
2020	6,042
2019	2,847
2018	3,425
2017 and Prior	11,854
Total loans with credit quality measures	28,741
Commercial real estate | Owner occupied | Internal Grade 14 (Substandard non-accrual)
Internal risk grades of non-covered loans
2022	14
2021	868
2019	(4)
2018	330
2017 and Prior	2,261
Total loans with credit quality measures	3,469
Commercial and industrial
Internal risk grades of non-covered loans
Total	1,668,209	1,875,420
Commercial and industrial | Internal Grade 1-3 (Pass low risk)
Internal risk grades of non-covered loans
2022	29,353
2021	27,282
2020	26,549
2019	6,945
2018	1,994
2017 and Prior	2,313
Revolving	50,244
Total loans with credit quality measures	144,680
Commercial and industrial | Internal Grade 4-7 (Pass normal risk)
Internal risk grades of non-covered loans
2022	135,610
2021	142,831
2020	51,782
2019	29,790
2018	10,412
2017 and Prior	16,103
Revolving	349,402
Total loans with credit quality measures	735,930
Commercial and industrial | Internal Grade 8-11 (Pass high risk and watch)
Internal risk grades of non-covered loans
2022	88,284
2021	67,652
2020	53,440
2019	18,638
2018	3,141
2017 and Prior	7,918
Revolving	274,261
Total loans with credit quality measures	513,334
Commercial and industrial | Internal Grade 12 (Special mention)
Internal risk grades of non-covered loans
2022	86
2019	453
Revolving	2,654
Total loans with credit quality measures	3,193
Commercial and industrial | Internal Grade 13 (Substandard accrual)
Internal risk grades of non-covered loans
2022	671
2021	2,972
2020	7,150
2019	3,839
2018	3,917
2017 and Prior	3,160
Revolving	4,248
Total loans with credit quality measures	25,957
Commercial and industrial | Internal Grade 14 (Substandard non-accrual)
Internal risk grades of non-covered loans
2022	308
2021	85
2020	7,882
2018	3,500
2017 and Prior	303
Total loans with credit quality measures	12,078
Commercial and industrial | Mortgage Warehouse Lending
Internal risk grades of non-covered loans
Loans without credit quality measures	223,028
Commercial and industrial | Loans Funded Through Paycheck Protection Program
Internal risk grades of non-covered loans
Loans without credit quality measures	1,097
Total	1,100	77,700
Commercial and industrial | Loans Accounted At Fair Value
Internal risk grades of non-covered loans
Loans without credit quality measures	8,912
Construction and Land Development
Internal risk grades of non-covered loans
Total	934,915	892,783
Construction and Land Development | FICO Score, 620 to 720
Internal risk grades of non-covered loans
2022	781
2021	223
2018	981
Total loans with credit quality measures	1,985
Construction and Land Development | FICO Score, Greater than 720
Internal risk grades of non-covered loans
2022	14,969
2021	3,933
2020	54
Total loans with credit quality measures	18,956
Construction and Land Development | Other.
Internal risk grades of non-covered loans
2022	4,198
Total loans with credit quality measures	4,198
Construction and Land Development | Internal Grade 1-3 (Pass low risk)
Internal risk grades of non-covered loans
2022	12,673
2021	15,535
2020	1,341
2019	889
2018	1,047
2017 and Prior	2,984
Revolving	1
Total loans with credit quality measures	34,470
Construction and Land Development | Internal Grade 4-7 (Pass normal risk)
Internal risk grades of non-covered loans
2022	272,658
2021	210,391
2020	63,325
2019	13,191
2018	3,252
2017 and Prior	1,947
Revolving	48,263
Total loans with credit quality measures	613,027
Construction and Land Development | Internal Grade 8-11 (Pass high risk and watch)
Internal risk grades of non-covered loans
2022	148,054
2021	74,383
2020	16,404
2019	325
2017 and Prior	1,479
Revolving	15,352
Total loans with credit quality measures	255,997
Construction and Land Development | Internal Grade 13 (Substandard accrual)
Internal risk grades of non-covered loans
2022	1,019
2017 and Prior	5,262
Total loans with credit quality measures	6,281
Construction and Land Development | Internal Grade 14 (Substandard non-accrual)
Internal risk grades of non-covered loans
2017 and Prior	1
Total loans with credit quality measures	1
1 - 4 family residential
Internal risk grades of non-covered loans
Total	1,595,270	1,303,430
1 - 4 family residential | FICO Score, Less than 620
Internal risk grades of non-covered loans
2022	1,184
2021	733
2020	779
2019	541
2018	3,538
2017 and Prior	21,699
Revolving	266
Total loans with credit quality measures	28,740
1 - 4 family residential | FICO Score, 620 to 720
Internal risk grades of non-covered loans
2022	6,077
2021	13,805
2020	8,530
2019	5,265
2018	6,013
2017 and Prior	26,482
Revolving	3,705
Total loans with credit quality measures	69,877
1 - 4 family residential | FICO Score, Greater than 720
Internal risk grades of non-covered loans
2022	334,135
2021	806,223
2020	109,048
2019	46,361
2018	29,057
2017 and Prior	48,786
Revolving	3,171
Total loans with credit quality measures	1,376,781
1 - 4 family residential | Substandard non-accrual
Internal risk grades of non-covered loans
2020	(1)
2018	260
2017 and Prior	12,589
Total loans with credit quality measures	12,848
1 - 4 family residential | Other.
Internal risk grades of non-covered loans
2022	78,521
2021	18,571
2020	1,616
2019	2,403
2018	577
2017 and Prior	4,082
Revolving	1,254
Total loans with credit quality measures	107,024
Consumer
Internal risk grades of non-covered loans
Total	29,439	32,349
Consumer | FICO Score, Less than 620
Internal risk grades of non-covered loans
2022	1,349
2021	332
2020	123
2019	48
2018	7
2017 and Prior	15
Revolving	351
Total loans with credit quality measures	2,225
Consumer | FICO Score, 620 to 720
Internal risk grades of non-covered loans
2022	3,226
2021	1,736
2020	575
2019	453
2018	35
2017 and Prior	378
Revolving	1,923
Total loans with credit quality measures	8,326
Consumer | FICO Score, Greater than 720
Internal risk grades of non-covered loans
2022	5,843
2021	1,705
2020	1,283
2019	413
2018	85
2017 and Prior	1
Revolving	3,201
Total loans with credit quality measures	12,531
Consumer | Substandard non-accrual
Internal risk grades of non-covered loans
2017 and Prior	16
Total loans with credit quality measures	16
Consumer | Other.
Internal risk grades of non-covered loans
2022	4,296
2021	1,326
2020	464
2019	89
2018	5
2017 and Prior	18
Revolving	143
Total loans with credit quality measures	6,341
Broker-dealer
Internal risk grades of non-covered loans
Loans without credit quality measures	402,502
Total	$ 402,502	$ 733,193