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Loans - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 86,670	$ 37,520	$ 34,203
Impact of Adopting ASC 326	64,586	86,670	37,520
Charge-offs	12,234	12,394	10,131
Recoveries	948	1,268	4,241
Provision	(10,798)	59,028	9,207
Ending Balance	64,586	86,670	37,520
Average Balance	$ 5,343,976	$ 4,950,545	$ 3,972,861
Net Charge-offs to Loan Average Balance	0.21%	0.22%	0.15%
Provision (benefit) for credit losses	$ (10,800)	$ 59,900	$ 9,600
Provision (release) for off-balance sheet commitments	68	902	361
Credit loss expense (benefit)	101	30
Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance		1,248
Impact of Adopting ASC 326			1,248
Ending Balance			1,248
Real estate | Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	15,430	10,013	8,999
Impact of Adopting ASC 326	13,425	15,430	10,013
Charge-offs	170	4,924	1,420
Recoveries	65	19	341
Provision	(1,900)	15,374	2,093
Ending Balance	13,425	15,430	10,013
Average Balance	$ 1,501,890	$ 1,322,477	$ 1,247,941
Net Charge-offs to Loan Average Balance	0.01%	0.37%	0.09%
Real estate | Commercial real estate | Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance		$ (5,052)
Impact of Adopting ASC 326			$ (5,052)
Ending Balance			(5,052)
Real estate | Construction/land/land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 8,191	3,711	3,331
Impact of Adopting ASC 326	4,011	8,191	3,711
Charge-offs	0	0	38
Recoveries	0	1	40
Provision	(4,180)	3,338	378
Ending Balance	4,011	8,191	3,711
Average Balance	$ 528,618	$ 554,038	$ 505,795
Net Charge-offs to Loan Average Balance	0.00%	0.00%	0.00%
Real estate | Construction/land/land development | Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance		$ 1,141
Impact of Adopting ASC 326			$ 1,141
Ending Balance			1,141
Real estate | Residential real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 9,418	6,332	5,705
Impact of Adopting ASC 326	6,116	9,418	6,332
Charge-offs	78	692	265
Recoveries	117	202	185
Provision	(3,341)	6,102	707
Ending Balance	6,116	9,418	6,332
Average Balance	$ 916,039	$ 769,838	$ 661,581
Net Charge-offs to Loan Average Balance	0.00%	0.06%	0.01%
Real estate | Residential real estate | Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance		$ (2,526)
Impact of Adopting ASC 326			$ (2,526)
Ending Balance			(2,526)
Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 51,857	16,960	15,616
Impact of Adopting ASC 326	40,146	51,857	16,960
Charge-offs	11,923	6,702	8,231
Recoveries	717	1,022	3,627
Provision	(505)	33,281	5,948
Ending Balance	40,146	51,857	16,960
Average Balance	$ 1,627,077	$ 1,710,648	$ 1,324,002
Net Charge-offs to Loan Average Balance	0.69%	0.33%	0.35%
Commercial and industrial | Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance		$ 7,296
Impact of Adopting ASC 326			$ 7,296
Ending Balance			7,296
Mortgage warehouse lines of credit
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 856	262	316
Impact of Adopting ASC 326	340	856	262
Charge-offs	0	0	29
Recoveries	0	0	0
Provision	(516)	565	(25)
Ending Balance	340	856	262
Average Balance	$ 753,588	$ 574,837	$ 212,733
Net Charge-offs to Loan Average Balance	0.00%	0.00%	0.01%
Mortgage warehouse lines of credit | Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance		$ 29
Impact of Adopting ASC 326			$ 29
Ending Balance			29
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 918	242	236
Impact of Adopting ASC 326	548	918	242
Charge-offs	63	76	148
Recoveries	49	24	48
Provision	(356)	368	106
Ending Balance	548	918	242
Average Balance	$ 16,764	$ 18,707	$ 20,809
Net Charge-offs to Loan Average Balance	0.08%	0.28%	0.48%
Consumer | Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance		$ 360
Impact of Adopting ASC 326			$ 360
Ending Balance			$ 360

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Percentage of writeoff after recovery to average financing receivables outstanding.

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Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at amortized cost (held-to-maturity).

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Amount excluding accrued interest, of allowance for credit loss on financing receivable.

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Amount of increase in allowance for credit loss on financing receivable from recovery.

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