Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Additional Information (Details 2)	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) KeyRatio	Jun. 30, 2021 USD ($)	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	51,200,000		$ 51,200,000		$ 69,900,000
Percentage of outstanding principal to be repurchased under GNMA optional repurchase program			100.00%
Financing Receivable [Abstract]
PCL	2,716,000	$ (3,991,000)	$ 1,856,000	$ (14,492,000)
Other Secured by 1-4 Family Residential Properties [Member]
Financing Receivable [Abstract]
PCL		1,600,000
Other Construction [Member]
Financing Receivable [Abstract]
PCL		1,400,000	8,200,000
Secured by 1-4 Family Residential Properties [Member]
Financing Receivable [Abstract]
PCL	6,700,000		9,600,000
Other Commercial Loans [Member]
Financing Receivable [Abstract]
PCL	1,400,000
Allowance for Credit Losses, ACL [Member]
Financing Receivable [Abstract]
PCL	(2,716,000)	(3,991,000)	1,856,000	(14,492,000)
Allowance for Credit Losses, ACL [Member] | Commercial and Industrial Loans [Member]
Financing Receivable [Abstract]
PCL	(961,000)	(3,171,000)	(4,764,000)	880,000
Allowance for Credit Losses, ACL [Member] | State and Other Political Subdivision Loans [Member]
Financing Receivable [Abstract]
PCL	(454,000)	218,000	(791,000)	43,000
Allowance for Credit Losses, ACL [Member] | Other Commercial Loans [Member]
Financing Receivable [Abstract]
PCL	1,372,000	$ 402,000	509,000	$ (841,000)
Minimum [Member]
Financing Receivable [Abstract]
Credit amount used as baseline in evaluating loan policy	$ 100,000		$ 100,000