Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Additional Information (Details 2)	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) KeyRatio	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Financing Receivable Recorded Investment [Line Items]
Number of days used as baseline in evaluating collateral documentation exceptions for loan policy			90 days
Number of key quality ratios | KeyRatio			6
Exposure for commercial non accrual loans to be reviewed on individual basis	$ 500,000		$ 500,000
Exposure for commercial accrual loans deemed to be reviewed on individual basis	500,000		500,000
LHFS past due 90 days or more	48,300,000		$ 48,300,000		$ 69,900,000
Percentage of outstanding principal to be repurchased under GNMA optional repurchase program			100.00%
Financing Receivable [Abstract]
PCL	12,919,000	$ (2,492,000)	$ 14,775,000	$ (16,984,000)
Secured by 1-4 Family Residential Properties [Member]
Financing Receivable [Abstract]
PCL	3,800,000
Commercial and Industrial Loans [Member]
Financing Receivable [Abstract]
PCL		3,400,000		4,300,000
Allowance for Credit Losses, ACL [Member]
Financing Receivable [Abstract]
PCL	(12,919,000)	(2,492,000)	14,775,000	(16,984,000)
Allowance for Credit Losses, ACL [Member] | Commercial and Industrial Loans [Member]
Financing Receivable [Abstract]
PCL	(10,081,000)	3,377,000	(5,317,000)	4,257,000
Allowance for Credit Losses, ACL [Member] | State and Other Political Subdivision Loans [Member]
Financing Receivable [Abstract]
PCL	(323,000)	(269,000)	(1,114,000)	(226,000)
Allowance for Credit Losses, ACL [Member] | Other Commercial Loans [Member]
Financing Receivable [Abstract]
PCL	661,000	$ (1,989,000)	1,170,000	$ (2,830,000)
Minimum [Member]
Financing Receivable [Abstract]
Credit amount used as baseline in evaluating loan policy	$ 100,000		$ 100,000