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Loans and Leases Held for Investment, Net of Allowance For Loan and Lease Losses - Allowance For Credit Losses (Details) - USD ($) $ in Thousands			12 Months Ended
	Feb. 01, 2021	Jan. 31, 2021	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan and lease losses, beginning of period			$ 0
Credit loss expense for loans and leases held for investment			140,951
Initial allowance for PCD loans acquired during the period			12,440
Charge-offs (3)			(10,452)
Recoveries	$ 12,400		1,450
Allowance for loan and lease losses, end of period			144,389
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Initial allowance for PCD assets acquired during the period at acquisition date			30,378
Radius Bancorp, Inc
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Credit loss expense for loans and leases held for investment			6,900
Unfunded Loan Commitment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Reserve for unfunded lending commitments, beginning of period			0
Credit loss expense for unfunded lending commitments			1,231
Reserve for unfunded lending commitments, end of period			1,231
Unfunded Loan Commitment, Commitments To Extend Credit
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Reserve for unfunded lending commitments, end of period			110,800
PCD Loans Acquired
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge-offs (3)		$ (18,000)
Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan and lease losses, beginning of period			0
Credit loss expense for loans and leases held for investment			136,789
Initial allowance for PCD loans acquired during the period			603
Charge-offs (3)			(8,789)
Recoveries			209
Allowance for loan and lease losses, end of period			128,812
Consumer Portfolio Segment \| Unfunded Loan Commitment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Reserve for unfunded lending commitments, beginning of period			0
Credit loss expense for unfunded lending commitments			0
Reserve for unfunded lending commitments, end of period			0
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan and lease losses, beginning of period			0
Credit loss expense for loans and leases held for investment			4,162
Initial allowance for PCD loans acquired during the period			11,837
Charge-offs (3)			(1,663)
Recoveries			1,241
Allowance for loan and lease losses, end of period			15,577
Commercial Portfolio Segment \| Unfunded Loan Commitment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Reserve for unfunded lending commitments, beginning of period			0
Credit loss expense for unfunded lending commitments			1,231
Reserve for unfunded lending commitments, end of period			$ 1,231