Loans and Leases - Allowance for Loan and Lease Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	$ 188,705	$ 225,600	$ 200,564	$ 348,181
Charge-offs	(4,652)	(1,516)	(10,685)	(6,320)
Recoveries	2,274	1,149	8,448	8,372
Net (charge-offs) recoveries	(2,378)	(367)	(2,237)	2,052
Provision for credit losses	(3,000)	21,500	9,000	146,500
Balance, end of period	189,327	203,733	189,327	203,733
Amount of the allowance applicable to loans and leases:
Individually evaluated	3,857	2,910	3,857	2,910
Collectively evaluated	185,470	200,823	185,470	200,823
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated	91,884	92,833	91,884	92,833
Collectively evaluated	27,568,157	20,418,187	27,568,157	20,418,187
Loans held for investment, net	27,660,041	20,511,020	27,660,041	20,511,020	$ 22,941,548
Real Estate Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	85,287	107,013	98,053	138,342
Charge-offs	(1,604)	(29)	(3,310)	(663)
Recoveries	231	563	1,699	5,990
Net (charge-offs) recoveries	(1,373)	534	(1,611)	5,327
Provision for credit losses	5,018	11,344	17,546	47,466
Balance, end of period	78,896	96,203	78,896	96,203
Amount of the allowance applicable to loans and leases:
Individually evaluated	3,108	189	3,108	189
Collectively evaluated	75,788	96,014	75,788	96,014
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated	58,187	34,822	58,187	34,822
Collectively evaluated	14,572,562	9,546,135	14,572,562	9,546,135
Loans held for investment, net	14,630,749	9,580,957	14,630,749	9,580,957	11,178,720
Real Estate Construction and Land
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	41,778	54,582	45,079	78,356
Charge-offs	(1,006)	0	(1,013)	(775)
Recoveries	29	0	178	0
Net (charge-offs) recoveries	(977)	0	(835)	(775)
Provision for credit losses	(9,427)	1,923	(5,984)	24,922
Balance, end of period	50,228	52,659	50,228	52,659
Amount of the allowance applicable to loans and leases:
Individually evaluated	0	0	0	0
Collectively evaluated	50,228	52,659	50,228	52,659
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated	20,724	19,364	20,724	19,364
Collectively evaluated	4,272,792	3,632,509	4,272,792	3,632,509
Loans held for investment, net	4,293,516	3,651,873	4,293,516	3,651,873	3,437,127
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	54,031	57,697	48,718	126,403
Charge-offs	(1,522)	(951)	(5,266)	(3,802)
Recoveries	1,996	543	6,521	2,269
Net (charge-offs) recoveries	474	(408)	1,255	(1,533)
Provision for credit losses	3,284	9,792	1,248	77,373
Balance, end of period	51,221	47,497	51,221	47,497
Amount of the allowance applicable to loans and leases:
Individually evaluated	749	2,721	749	2,721
Collectively evaluated	50,472	44,776	50,472	44,776
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated	12,973	38,647	12,973	38,647
Collectively evaluated	8,258,209	6,833,575	8,258,209	6,833,575
Loans held for investment, net	8,271,182	6,872,222	8,271,182	6,872,222	7,868,051
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	7,609	6,308	8,714	5,080
Charge-offs	(520)	(536)	(1,096)	(1,080)
Recoveries	18	43	50	113
Net (charge-offs) recoveries	(502)	(493)	(1,046)	(967)
Provision for credit losses	(1,875)	1,559	(1,314)	3,261
Balance, end of period	8,982	7,374	8,982	7,374
Amount of the allowance applicable to loans and leases:
Individually evaluated	0	0	0	0
Collectively evaluated	8,982	7,374	8,982	7,374
The ending balance of the loan and lease portfolio is composed of loans and leases:
Individually evaluated	0	0	0	0
Collectively evaluated	464,594	405,968	464,594	405,968
Loans held for investment, net	$ 464,594	$ 405,968	$ 464,594	$ 405,968	$ 457,650