Loans and Leases - Allowance for Loan and Lease Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	$ 197,398	$ 292,445	$ 200,564	$ 348,181
Charge-offs	(2,799)	(816)	(6,033)	(4,804)
Recoveries	4,106	5,971	6,174	7,223
Net (charge-offs) recoveries	1,307	5,155	141	2,419
Provision for credit losses	10,000	72,000	12,000	125,000
Balance, end of period	188,705	225,600	188,705	225,600
Amount of the allowance applicable to loans and leases:
Individually evaluated	952	3,468	952	3,468
Collectively evaluated	187,753	222,132	187,753	222,132
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated	78,718	90,799	78,718	90,799
Collectively evaluated	26,422,419	19,415,458	26,422,419	19,415,458
Loans held for investment, net	26,501,137	19,506,257	26,501,137	19,506,257	$ 22,941,548
Real Estate Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	86,715	141,122	98,053	138,342
Charge-offs	(1,538)	(266)	(1,706)	(634)
Recoveries	1,305	4,882	1,468	5,427
Net (charge-offs) recoveries	(233)	4,616	(238)	4,793
Provision for credit losses	1,195	38,725	12,528	36,122
Balance, end of period	85,287	107,013	85,287	107,013
Amount of the allowance applicable to loans and leases:
Individually evaluated	140	203	140	203
Collectively evaluated	85,147	106,810	85,147	106,810
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated	40,178	41,145	40,178	41,145
Collectively evaluated	13,509,468	8,371,875	13,509,468	8,371,875
Loans held for investment, net	13,549,646	8,413,020	13,549,646	8,413,020	11,178,720
Real Estate Construction and Land
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	44,161	66,775	45,079	78,356
Charge-offs	(7)	(75)	(7)	(775)
Recoveries	0	0	149	0
Net (charge-offs) recoveries	(7)	(75)	142	(775)
Provision for credit losses	2,376	12,118	3,443	22,999
Balance, end of period	41,778	54,582	41,778	54,582
Amount of the allowance applicable to loans and leases:
Individually evaluated	0	0	0	0
Collectively evaluated	41,778	54,582	41,778	54,582
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated	27,121	3,254	27,121	3,254
Collectively evaluated	3,963,918	3,502,330	3,963,918	3,502,330
Loans held for investment, net	3,991,039	3,505,584	3,991,039	3,505,584	3,437,127
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	57,056	78,716	48,718	126,403
Charge-offs	(911)	(277)	(3,744)	(2,851)
Recoveries	2,790	1,029	4,525	1,726
Net (charge-offs) recoveries	1,879	752	781	(1,125)
Provision for credit losses	4,904	21,771	4,532	67,581
Balance, end of period	54,031	57,697	54,031	57,697
Amount of the allowance applicable to loans and leases:
Individually evaluated	812	3,265	812	3,265
Collectively evaluated	53,219	54,432	53,219	54,432
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated	11,419	46,400	11,419	46,400
Collectively evaluated	8,465,387	7,175,844	8,465,387	7,175,844
Loans held for investment, net	8,476,806	7,222,244	8,476,806	7,222,244	7,868,051
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	9,466	5,832	8,714	5,080
Charge-offs	(343)	(198)	(576)	(544)
Recoveries	11	60	32	70
Net (charge-offs) recoveries	(332)	(138)	(544)	(474)
Provision for credit losses	1,525	614	561	1,702
Balance, end of period	7,609	6,308	7,609	6,308
Amount of the allowance applicable to loans and leases:
Individually evaluated	0	0	0	0
Collectively evaluated	7,609	6,308	7,609	6,308
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated	0	0	0	0
Collectively evaluated	483,646	365,409	483,646	365,409
Loans held for investment, net	$ 483,646	$ 365,409	$ 483,646	$ 365,409	$ 457,650