Loans Held for Investment - Internal Risk Grades (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Internal risk grades of non-covered loans
2022	$ 1,392,936
2021	2,445,661
2020	1,008,687
2019	498,945
2018	375,766
2017 and Prior	545,827
Revolving	839,088
Total loans with credit quality measures	7,106,910
Total	7,930,619	$ 7,879,904
Commercial real estate
Internal risk grades of non-covered loans
Total	3,262,628	3,042,729
Commercial real estate | Non-owner occupied
Internal risk grades of non-covered loans
Total	1,911,136	1,729,699
Commercial real estate | Non-owner occupied | Internal Grade 1-3 (Pass low risk)
Internal risk grades of non-covered loans
2022	44,621
2021	74,976
2020	20,075
2019	9,882
2018	8,788
2017 and Prior	11,757
Revolving	2
Total loans with credit quality measures	170,101
Commercial real estate | Non-owner occupied | Internal Grade 4-7 (Pass normal risk)
Internal risk grades of non-covered loans
2022	284,152
2021	296,372
2020	143,410
2019	115,193
2018	41,986
2017 and Prior	80,885
Revolving	28,181
Total loans with credit quality measures	990,179
Commercial real estate | Non-owner occupied | Internal Grade 8-11 (Pass high risk and watch)
Internal risk grades of non-covered loans
2022	82,153
2021	166,149
2020	181,713
2019	81,382
2018	72,866
2017 and Prior	92,202
Revolving	1,550
Total loans with credit quality measures	678,015
Commercial real estate | Non-owner occupied | Internal Grade 13 (Substandard accrual)
Internal risk grades of non-covered loans
2022	37,929
2021	14,659
2020	4,093
2019	8,222
2018	25
2017 and Prior	6,657
Total loans with credit quality measures	71,585
Commercial real estate | Non-owner occupied | Internal Grade 14 (Substandard non-accrual)
Internal risk grades of non-covered loans
2021	403
2017 and Prior	853
Total loans with credit quality measures	1,256
Commercial real estate | Owner occupied
Internal risk grades of non-covered loans
Total	1,351,492	1,313,030
Commercial real estate | Owner occupied | Internal Grade 1-3 (Pass low risk)
Internal risk grades of non-covered loans
2022	24,732
2021	111,984
2020	58,631
2019	18,662
2018	13,920
2017 and Prior	60,532
Revolving	6,002
Total loans with credit quality measures	294,463
Commercial real estate | Owner occupied | Internal Grade 4-7 (Pass normal risk)
Internal risk grades of non-covered loans
2022	128,192
2021	178,018
2020	96,688
2019	88,070
2018	93,945
2017 and Prior	73,876
Revolving	13,760
Total loans with credit quality measures	672,549
Commercial real estate | Owner occupied | Internal Grade 8-11 (Pass high risk and watch)
Internal risk grades of non-covered loans
2022	45,893
2021	70,970
2020	92,234
2019	30,607
2018	63,765
2017 and Prior	30,528
Revolving	13,571
Total loans with credit quality measures	347,568
Commercial real estate | Owner occupied | Internal Grade 13 (Substandard accrual)
Internal risk grades of non-covered loans
2022	4,185
2021	487
2020	6,090
2019	3,029
2018	6,246
2017 and Prior	13,184
Total loans with credit quality measures	33,221
Commercial real estate | Owner occupied | Internal Grade 14 (Substandard non-accrual)
Internal risk grades of non-covered loans
2022	108
2021	893
2019	(4)
2018	335
2017 and Prior	2,359
Total loans with credit quality measures	3,691
Commercial and industrial
Internal risk grades of non-covered loans
Total	1,786,116	1,875,420
Commercial and industrial | Internal Grade 1-3 (Pass low risk)
Internal risk grades of non-covered loans
2022	17,214
2021	29,527
2020	28,377
2019	23,373
2018	2,385
2017 and Prior	2,819
Revolving	41,940
Total loans with credit quality measures	145,635
Commercial and industrial | Internal Grade 4-7 (Pass normal risk)
Internal risk grades of non-covered loans
2022	111,653
2021	136,239
2020	70,470
2019	17,397
2018	12,734
2017 and Prior	18,508
Revolving	367,904
Total loans with credit quality measures	734,905
Commercial and industrial | Internal Grade 8-11 (Pass high risk and watch)
Internal risk grades of non-covered loans
2022	53,684
2021	81,940
2020	53,889
2019	20,382
2018	3,850
2017 and Prior	5,998
Revolving	268,569
Total loans with credit quality measures	488,312
Commercial and industrial | Internal Grade 12 (Special mention)
Internal risk grades of non-covered loans
2022	92
Total loans with credit quality measures	92
Commercial and industrial | Internal Grade 13 (Substandard accrual)
Internal risk grades of non-covered loans
2022	3,220
2021	1,910
2020	7,413
2019	6,175
2018	7,624
2017 and Prior	7,377
Revolving	9,433
Total loans with credit quality measures	43,152
Commercial and industrial | Internal Grade 14 (Substandard non-accrual)
Internal risk grades of non-covered loans
2022	241
2021	1,442
2020	11,094
2018	229
2017 and Prior	309
Total loans with credit quality measures	13,315
Commercial and industrial | Mortgage Warehouse Lending
Internal risk grades of non-covered loans
Loans without credit quality measures	344,662
Commercial and industrial | Loans Funded Through Paycheck Protection Program
Internal risk grades of non-covered loans
Loans without credit quality measures	7,016
Total	7,000	77,700
Commercial and industrial | Loans Accounted At Fair Value
Internal risk grades of non-covered loans
Loans without credit quality measures	9,027
Construction and Land Development
Internal risk grades of non-covered loans
Total	922,047	892,783
Construction and Land Development | FICO Score, 620 to 720
Internal risk grades of non-covered loans
2022	530
2021	72
2018	993
Total loans with credit quality measures	1,595
Construction and Land Development | FICO Score, Greater than 720
Internal risk grades of non-covered loans
2022	11,714
2021	5,822
2020	55
Total loans with credit quality measures	17,591
Construction and Land Development | Other.
Internal risk grades of non-covered loans
2022	3,133
2021	174
Total loans with credit quality measures	3,307
Construction and Land Development | Internal Grade 1-3 (Pass low risk)
Internal risk grades of non-covered loans
2022	9,291
2021	18,711
2020	22,587
2019	929
2018	1,514
2017 and Prior	3,151
Total loans with credit quality measures	56,183
Construction and Land Development | Internal Grade 4-7 (Pass normal risk)
Internal risk grades of non-covered loans
2022	172,579
2021	283,798
2020	51,938
2019	15,522
2018	3,381
2017 and Prior	2,208
Revolving	60,345
Total loans with credit quality measures	589,771
Construction and Land Development | Internal Grade 8-11 (Pass high risk and watch)
Internal risk grades of non-covered loans
2022	93,777
2021	102,553
2020	32,549
2019	862
2018	118
2017 and Prior	1,596
Revolving	15,517
Total loans with credit quality measures	246,972
Construction and Land Development | Internal Grade 13 (Substandard accrual)
Internal risk grades of non-covered loans
2021	1,328
2019	23
2017 and Prior	5,276
Total loans with credit quality measures	6,627
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	1,468,962	1,303,430
1 - 4 family residential | FICO Score, Less than 620
Internal risk grades of non-covered loans
2022	204
2021	814
2020	784
2019	834
2018	3,561
2017 and Prior	23,679
Revolving	253
Total loans with credit quality measures	30,129
1 - 4 family residential | FICO Score, 620 to 720
Internal risk grades of non-covered loans
2022	3,130
2021	14,876
2020	8,634
2019	5,992
2018	6,269
2017 and Prior	28,804
Revolving	2,715
Total loans with credit quality measures	70,420
1 - 4 family residential | FICO Score, Greater than 720
Internal risk grades of non-covered loans
2022	194,965
2021	816,610
2020	111,904
2019	48,471
2018	30,196
2017 and Prior	54,972
Revolving	3,279
Total loans with credit quality measures	1,260,397
1 - 4 family residential | Substandard non-accrual
Internal risk grades of non-covered loans
2020	(1)
2018	266
2017 and Prior	13,097
Total loans with credit quality measures	13,362
1 - 4 family residential | Other.
Internal risk grades of non-covered loans
2022	54,621
2021	28,516
2020	3,146
2019	2,503
2018	583
2017 and Prior	4,705
Revolving	580
Total loans with credit quality measures	94,654
Consumer
Internal risk grades of non-covered loans
Total	27,862	32,349
Consumer | FICO Score, Less than 620
Internal risk grades of non-covered loans
2022	1,288
2021	411
2020	138
2019	83
2018	15
2017 and Prior	47
Revolving	336
Total loans with credit quality measures	2,318
Consumer | FICO Score, 620 to 720
Internal risk grades of non-covered loans
2022	2,824
2021	2,020
2020	670
2019	573
2018	44
2017 and Prior	401
Revolving	1,809
Total loans with credit quality measures	8,341
Consumer | FICO Score, Greater than 720
Internal risk grades of non-covered loans
2022	3,184
2021	2,063
2020	1,614
2019	542
2018	120
2017 and Prior	2
Revolving	3,072
Total loans with credit quality measures	10,597
Consumer | Substandard non-accrual
Internal risk grades of non-covered loans
2017 and Prior	19
Total loans with credit quality measures	19
Consumer | Other.
Internal risk grades of non-covered loans
2022	3,627
2021	1,924
2020	492
2019	241
2018	8
2017 and Prior	25
Revolving	270
Total loans with credit quality measures	6,587
Broker-dealer
Internal risk grades of non-covered loans
Loans without credit quality measures	463,004
Total	$ 463,004	$ 733,193