Loans - Narrative (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022 USD ($) loan	Sep. 30, 2021 loan	Sep. 30, 2022 USD ($) loan	Sep. 30, 2021 loan	Dec. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchase credit deteriorated loans	$ 3,637,817,000		$ 3,637,817,000		$ 2,967,247,000
Interest income on non-accrual loans	5,000		32,000		80,000
Troubled debt restructurings	0		0		104,000
Allowance for troubled debt restructurings	0		0		0
Additional lending amount to customers whose loan terms has been modified in troubled debt restructuring	$ 0		$ 0		0
Number of loans modified as troubled debt restructurings | loan	0	0	0	0
Number of loans modified as troubled debt restructuring subsequently defaulted | loan	0	0	0	0
Threshold amount to individually classify loans by credit risk	$ 250,000		$ 250,000
PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchase credit deteriorated loans	34,929,000		$ 34,929,000		9,861,000
PPP
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan interest rate			1.00%
Maturities of loans originated under first round (in years)			2 years
Maturities of loans originated under second round (in years)			5 years
Loans outstanding originated under first round						$ 351,260,000
Fees on loans originated under first round						$ 12,024,000
Number of loans originated under first round | loan						3,070
Forgiven loans originated under first round	351,260,000		$ 351,260,000
Net processing fees recognized on loans originated under first round			12,024,000
Loans outstanding originated under second round					157,042,000
Fees on loans originated during second round					$ 9,022,000
Number of loans originated under second round | loan					2,601
Forgiven loans originated during second round	157,042,000		157,042,000
Net processing fees recognized on loans originated under second round			9,022,000
Loans outstanding	$ 0		$ 0