Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Additional Information (Details 1) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($) Region	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Accrued interest receivable	$ 38,200		$ 26,700
Maximum concentration of loan as a percentage of total LHFI	10.00%
Key market regions | Region	5
LHFI classified as TDRs	$ 15,700	$ 23,500
LHFI classified as TDRs from credits with interest only payments and credits renewed at a rate that was not commensurate with that of new debt with similar risk	13,600	20,100
Unused commitments on TDRs	86,000	1,000
Financing receivable, related allowance	1,300	2,600
Financing receivable, related charge-offs	9	$ 3,700
Foreclosed residential real estate properties recorded as a result of obtaining physical possession of property	1,200		94
Consumer mortgage loans and that formal foreclosure proceedings are in process	$ 1,800		$ 1,200