Loans - Summary of Allowance for Loan Losses by Portfolio Class and Category (Details) - Portfolio loans, net - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Allowance for Loan Losses [Roll Forward]
Beginning Balance	$ 140,546	$ 128,185	$ 145,041	$ 136,671
Initial allowance on acquired PCD loans		7,006		7,006
Provision (benefit) for credit losses	504	18,755	(2,645)	16,785
Charge-offs	(1,999)	(4,251)	(6,139)	(12,558)
Recoveries	1,521	2,401	4,315	4,192
Ending Balance	140,572	152,096	140,572	152,096
Commercial and industrial
Allowance for Loan Losses [Roll Forward]
Beginning Balance	65,646	53,351	63,825	58,812
Initial allowance on acquired PCD loans		1,077		1,077
Provision (benefit) for credit losses	4,202	9,836	7,283	8,538
Charge-offs	(1,320)	(2,829)	(3,576)	(8,019)
Recoveries	640	452	1,636	1,479
Ending Balance	69,168	61,887	69,168	61,887
Commercial and industrial | First Choice Bancorp
Allowance for Loan Losses [Roll Forward]
Provision (benefit) for credit losses		23,900		23,900
CRE - investor owned
Allowance for Loan Losses [Roll Forward]
Beginning Balance	33,338	36,003	35,877	32,062
Initial allowance on acquired PCD loans		3,651		3,651
Provision (benefit) for credit losses	71	1,475	(2,488)	7,715
Charge-offs	0	(117)	(200)	(2,489)
Recoveries	225	1,623	445	1,696
Ending Balance	33,634	42,635	33,634	42,635
CRE - owner occupied
Allowance for Loan Losses [Roll Forward]
Beginning Balance	16,156	15,564	17,560	17,012
Initial allowance on acquired PCD loans		1,504		1,504
Provision (benefit) for credit losses	224	1,909	(1,424)	686
Charge-offs	(190)	(259)	(395)	(503)
Recoveries	232	15	681	34
Ending Balance	16,422	18,733	16,422	18,733
Construction and land development
Allowance for Loan Losses [Roll Forward]
Beginning Balance	13,180	11,632	14,536	21,413
Initial allowance on acquired PCD loans		37		37
Provision (benefit) for credit losses	(3,987)	2,215	(5,378)	(7,833)
Charge-offs	0	(3)	0	(3)
Recoveries	10	171	45	438
Ending Balance	9,203	14,052	9,203	14,052
Residential real estate
Allowance for Loan Losses [Roll Forward]
Beginning Balance	7,478	4,677	7,927	4,585
Initial allowance on acquired PCD loans		0		0
Provision (benefit) for credit losses	99	5,271	(50)	5,374
Charge-offs	(401)	(840)	(1,706)	(1,155)
Recoveries	365	115	1,370	419
Ending Balance	7,541	9,223	7,541	9,223
Other
Allowance for Loan Losses [Roll Forward]
Beginning Balance	4,748	6,958	5,316	2,787
Initial allowance on acquired PCD loans		737		737
Provision (benefit) for credit losses	(105)	(1,951)	(588)	2,305
Charge-offs	(88)	(203)	(262)	(389)
Recoveries	49	25	138	126
Ending Balance	$ 4,604	$ 5,566	$ 4,604	$ 5,566