Segment Reporting (Details) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Loans and Leases Receivable, Allowance		$ (200,732)	$ (200,564)	$ (348,181)
Loans held for investment, net		28,609,129	22,941,548
Loans and leases, net	[1]	28,408,397	22,740,984
Goodwill		1,376,736	1,405,736	$ 1,078,670
Core deposit and customer relationship intangibles, net		31,381	44,957
Assets		41,228,936	40,443,344
Deposits		33,936,334	34,997,757
Commercial Banking
Segment Reporting Information [Line Items]
Loans and Leases Receivable, Allowance		(181,912)	(193,871)
Loans held for investment, net		25,295,591	21,562,889
Loans and leases, net		25,113,679	21,369,018
Goodwill		1,280,288	1,280,288
Core deposit and customer relationship intangibles, net		31,358	44,662
Assets		41,045,166	40,248,429
Deposits		34,269,432	35,145,734
Civic Acquisition
Segment Reporting Information [Line Items]
Loans and Leases Receivable, Allowance		(18,820)	(6,693)
Loans and leases, net		3,294,718	1,371,966
Goodwill		96,448	125,448
Core deposit and customer relationship intangibles, net		23	295
Assets		3,590,129	1,616,914
Deposits		16,031	26,877
Other Segment
Segment Reporting Information [Line Items]
Loans and Leases Receivable, Allowance		0	0
Loans held for investment, net		0	0
Loans and leases, net		0	0
Goodwill		0	0
Core deposit and customer relationship intangibles, net		0	0
Assets		(3,406,359)	(1,421,999)
Deposits		$ (349,129)	$ (174,854)

[1] Excludes accrued interest receivable of $124.3 million and $80.3 million at December 31, 2022 and 2021, which is recorded in "Other assets" on the consolidated balance sheets.