Loans and Leases - Allowance for Loan and Lease Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	$ 210,055	$ 197,398	$ 200,732	$ 200,564
Charge-offs	(31,708)	(2,799)	(42,105)	(6,033)
Recoveries	887	4,106	2,107	6,174
Net (charge-offs) recoveries	(30,821)	1,307	(39,998)	141
Provision for credit losses	40,000	10,000	58,500	12,000
Balance, end of period	219,234	188,705	219,234	188,705
Amount of the allowance applicable to loans and leases:
Individually evaluated	0	952	0	952
Collectively evaluated	219,234	187,753	219,234	187,753
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated	105,094	78,718	105,094	78,718
Collectively evaluated	22,153,116	26,422,419	22,153,116	26,422,419
Loans held for investment, net	22,258,210	26,501,137	22,258,210	26,501,137	$ 28,609,129
Real Estate Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	109,483	87,228	87,309	98,624
Charge-offs	(23,875)	(1,545)	(33,710)	(1,713)
Recoveries	62	1,305	262	1,468
Net (charge-offs) recoveries	(23,813)	(240)	(33,448)	(245)
Provision for credit losses	(47,138)	1,092	(78,947)	12,483
Balance, end of period	132,808	85,896	132,808	85,896
Amount of the allowance applicable to loans and leases:
Individually evaluated	0	140	0	140
Collectively evaluated	132,808	85,756	132,808	85,756
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated	101,968	60,657	101,968	60,657
Collectively evaluated	14,186,074	13,993,428	14,186,074	13,993,428
Loans held for investment, net	14,288,042	14,054,085	14,288,042	14,054,085	15,730,324
Real Estate Construction and Land
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	55,034	43,648	52,320	44,508
Charge-offs	0	0	0	0
Recoveries	0	0	0	149
Net (charge-offs) recoveries	0	0	0	149
Provision for credit losses	15,355	2,479	12,641	3,488
Balance, end of period	39,679	41,169	39,679	41,169
Amount of the allowance applicable to loans and leases:
Individually evaluated	0	0	0	0
Collectively evaluated	39,679	41,169	39,679	41,169
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated	0	6,642	0	6,642
Collectively evaluated	2,465,523	3,479,958	2,465,523	3,479,958
Loans held for investment, net	2,465,523	3,486,600	2,465,523	3,486,600	4,152,172
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	37,195	57,056	52,849	48,718
Charge-offs	(7,347)	(911)	(7,484)	(3,744)
Recoveries	742	2,790	1,717	4,525
Net (charge-offs) recoveries	(6,605)	1,879	(5,767)	781
Provision for credit losses	(6,631)	4,904	(9,861)	(4,532)
Balance, end of period	37,221	54,031	37,221	54,031
Amount of the allowance applicable to loans and leases:
Individually evaluated	0	812	0	812
Collectively evaluated	37,221	53,219	37,221	53,219
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated	3,126	11,419	3,126	11,419
Collectively evaluated	5,091,660	8,465,387	5,091,660	8,465,387
Loans held for investment, net	5,094,786	8,476,806	5,094,786	8,476,806	8,281,962
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	8,343	9,466	8,254	8,714
Charge-offs	(486)	(343)	(911)	(576)
Recoveries	83	11	128	32
Net (charge-offs) recoveries	(403)	(332)	(783)	(544)
Provision for credit losses	(1,586)	(1,525)	(2,055)	(561)
Balance, end of period	9,526	7,609	9,526	7,609
Amount of the allowance applicable to loans and leases:
Individually evaluated	0	0	0	0
Collectively evaluated	9,526	7,609	9,526	7,609
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated	0	0	0	0
Collectively evaluated	409,859	483,646	409,859	483,646
Loans held for investment, net	$ 409,859	$ 483,646	$ 409,859	$ 483,646	$ 444,671