Loans and Leases - Allowance for Loan and Lease Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	$ 219,234	$ 188,705	$ 200,732	$ 200,564
Charge-offs	(6,695)	(4,652)	(48,800)	(10,685)
Recoveries	1,758	2,274	3,865	8,448
Net (charge-offs) recoveries	(4,937)	(2,378)	(44,935)	(2,237)
Provision for credit losses	8,000	3,000	66,500	9,000
Balance, end of period	222,297	189,327	222,297	189,327
Amount of the allowance applicable to loans and leases:
Individually evaluated	497	3,857	497	3,857
Collectively evaluated	221,800	185,470	221,800	185,470
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated	125,214	91,884	125,214	91,884
Collectively evaluated	21,795,732	27,568,157	21,795,732	27,568,157
Loans held for investment, net	21,920,946	27,660,041	21,920,946	27,660,041	$ 28,609,129
Real Estate Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	132,808	85,896	87,309	98,624
Charge-offs	(5,757)	(2,610)	(39,467)	(4,323)
Recoveries	535	231	797	1,699
Net (charge-offs) recoveries	(5,222)	(2,379)	(38,670)	(2,624)
Provision for credit losses	8,944	(4,065)	87,891	16,548
Balance, end of period	136,530	79,452	136,530	79,452
Amount of the allowance applicable to loans and leases:
Individually evaluated	0	3,108	0	3,108
Collectively evaluated	136,530	76,344	136,530	76,344
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated	120,491	77,503	120,491	77,503
Collectively evaluated	13,914,000	15,087,262	13,914,000	15,087,262
Loans held for investment, net	14,034,491	15,164,765	14,034,491	15,164,765	15,730,324
Real Estate Construction and Land
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	39,679	41,169	52,320	44,508
Charge-offs	0	0	0	0
Recoveries	0	29	0	178
Net (charge-offs) recoveries	0	29	0	178
Provision for credit losses	686	8,474	(11,955)	4,986
Balance, end of period	40,365	49,672	40,365	49,672
Amount of the allowance applicable to loans and leases:
Individually evaluated	0	0	0	0
Collectively evaluated	40,365	49,672	40,365	49,672
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated	0	1,408	0	1,408
Collectively evaluated	2,737,537	3,758,092	2,737,537	3,758,092
Loans held for investment, net	2,737,537	3,759,500	2,737,537	3,759,500	4,152,172
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	37,221	54,031	52,849	48,718
Charge-offs	(335)	(1,522)	(7,819)	(5,266)
Recoveries	1,199	1,996	2,916	6,521
Net (charge-offs) recoveries	864	474	(4,903)	1,255
Provision for credit losses	(1,411)	(3,284)	(11,272)	1,248
Balance, end of period	36,674	51,221	36,674	51,221
Amount of the allowance applicable to loans and leases:
Individually evaluated	497	749	497	749
Collectively evaluated	36,177	50,472	36,177	50,472
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated	4,723	12,973	4,723	12,973
Collectively evaluated	4,749,707	8,258,209	4,749,707	8,258,209
Loans held for investment, net	4,754,430	8,271,182	4,754,430	8,271,182	8,281,962
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	9,526	7,609	8,254	8,714
Charge-offs	(603)	(520)	(1,514)	(1,096)
Recoveries	24	18	152	50
Net (charge-offs) recoveries	(579)	(502)	(1,362)	(1,046)
Provision for credit losses	(219)	1,875	1,836	1,314
Balance, end of period	8,728	8,982	8,728	8,982
Amount of the allowance applicable to loans and leases:
Individually evaluated	0	0	0	0
Collectively evaluated	8,728	8,982	8,728	8,982
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated	0	0	0	0
Collectively evaluated	394,488	464,594	394,488	464,594
Loans held for investment, net	$ 394,488	$ 464,594	$ 394,488	$ 464,594	$ 444,671