Portfolio Loans - Summary of Allowance for Loan Losses by Portfolio Class and Category (Details) - Non-Covered Loans - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Nov. 12, 2020
Allowance for Loan Losses [Roll Forward]
Balance, beginning of year	$ 42,567	$ 136,671	$ 42,567	$ 42,295
CECL adoption	28,387
PCD loans immediately charged off	(1,680)	(13,000)	(63,400)	(6,700)
Provision (benefit) for loan losses		12,993	63,379	6,682
Initial Allowance on Acquired PCD Loans		7,006			$ 3,524
Charge-offs		(17,185)	(6,739)	(8,594)
Recoveries		5,556	6,512	2,184
Balance, end of year	69,995	145,041	136,671	42,567
Financing Receivable, Allowance For Credit Losses, Organic				42,567
Financing Receivable, Allowance For Credit Losses, Purchased Credit Impaired				721
Commercial and industrial
Allowance for Loan Losses [Roll Forward]
Balance, beginning of year	27,296	58,812	27,296	29,039
CECL adoption	6,494
PCD loans immediately charged off	0
Provision (benefit) for loan losses		14,361	28,373	4,801
Initial Allowance on Acquired PCD Loans		1,077			23
Charge-offs		(12,113)	(5,381)	(6,882)
Recoveries		1,688	1,848	338
Balance, end of year	33,949	63,825	58,812	27,296
Financing Receivable, Allowance For Credit Losses, Organic				27,296
Financing Receivable, Allowance For Credit Losses, Purchased Credit Impaired				159
Commercial - investor owned
Allowance for Loan Losses [Roll Forward]
Balance, beginning of year	5,935	32,062	5,935	4,683
CECL adoption	10,726
PCD loans immediately charged off	(5)
Provision (benefit) for loan losses		568	11,037	1,708
Initial Allowance on Acquired PCD Loans		3,651			2,026
Charge-offs		(2,487)	(498)	(551)
Recoveries		2,083	2,841	95
Balance, end of year	16,656	35,877	32,062	5,935
Financing Receivable, Allowance For Credit Losses, Organic				5,935
Financing Receivable, Allowance For Credit Losses, Purchased Credit Impaired				0
CRE - owner occupied
Allowance for Loan Losses [Roll Forward]
Balance, beginning of year	4,873	17,012	4,873	4,239
CECL adoption	2,598
PCD loans immediately charged off	(57)
Provision (benefit) for loan losses		(550)	7,845	673
Initial Allowance on Acquired PCD Loans		1,504			1,427
Charge-offs		(602)	(30)	(58)
Recoveries		196	356	19
Balance, end of year	7,414	17,560	17,012	4,873
Financing Receivable, Allowance For Credit Losses, Organic				4,873
Financing Receivable, Allowance For Credit Losses, Purchased Credit Impaired				0
Construction and land development
Allowance for Loan Losses [Roll Forward]
Balance, beginning of year	2,472	21,413	2,472	1,987
CECL adoption	5,183
PCD loans immediately charged off	(217)
Provision (benefit) for loan losses		(7,365)	13,438	(237)
Initial Allowance on Acquired PCD Loans		37			45
Charge-offs		(3)	(31)	(54)
Recoveries		454	384	776
Balance, end of year	7,577	14,536	21,413	2,472
Financing Receivable, Allowance For Credit Losses, Organic				2,472
Financing Receivable, Allowance For Credit Losses, Purchased Credit Impaired				139
Residential real estate
Allowance for Loan Losses [Roll Forward]
Balance, beginning of year	1,280	4,585	1,280	1,616
CECL adoption	3,470
PCD loans immediately charged off	(1,401)
Provision (benefit) for loan losses		3,900	674	(330)
Initial Allowance on Acquired PCD Loans		0			3
Charge-offs		(1,521)	(408)	(667)
Recoveries		963	967	661
Balance, end of year	3,349	7,927	4,585	1,280
Financing Receivable, Allowance For Credit Losses, Organic				1,280
Financing Receivable, Allowance For Credit Losses, Purchased Credit Impaired				0
Other
Allowance for Loan Losses [Roll Forward]
Balance, beginning of year	711	2,787	711	731
CECL adoption	(84)
PCD loans immediately charged off	0
Provision (benefit) for loan losses		2,079	2,012	67
Initial Allowance on Acquired PCD Loans		737			$ 0
Charge-offs		(459)	(391)	(382)
Recoveries		172	116	295
Balance, end of year	$ 1,050	$ 5,316	$ 2,787	711
Financing Receivable, Allowance For Credit Losses, Organic				711
Financing Receivable, Allowance For Credit Losses, Purchased Credit Impaired				$ 423