Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Impact of Modifications Classified as Troubled Debt Restructurings (Details) - Troubled Debt Restructurings [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) Contract	Mar. 31, 2020 USD ($) Contract
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract	3	11
Pre-Modification Outstanding Recorded Investment	$ 140	$ 2,103
Post-Modification Outstanding Recorded Investment	$ 140	$ 2,103
Other Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract	2	5
Pre-Modification Outstanding Recorded Investment	$ 126	$ 501
Post-Modification Outstanding Recorded Investment	$ 126	$ 501
Commercial and Industrial Loans [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract	1	2
Pre-Modification Outstanding Recorded Investment	$ 14	$ 1,582
Post-Modification Outstanding Recorded Investment	$ 14	$ 1,582
Consumer Loans [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract		4
Pre-Modification Outstanding Recorded Investment		$ 20
Post-Modification Outstanding Recorded Investment		$ 20