Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Troubled Debt Restructuring Subsequently Defaulted (Details) - Troubled Debt Restructurings that Subsequently Defaulted [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) Contract	Dec. 31, 2018 USD ($) Contract	Dec. 31, 2017 USD ($) Contract
Troubled Debt Restructurings [Abstract]
Number of Contracts | Contract	11	13	7
Recorded Investment | $	$ 665	$ 15,935	$ 9,604
Construction, Land Development and Other Land [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts | Contract		1
Recorded Investment | $		$ 22
Secured by 1-4 Family Residential Properties [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts | Contract	3	5	4
Recorded Investment | $	$ 446	$ 734	$ 78
Commercial and Industrial Loans [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts | Contract	7	6	3
Recorded Investment | $	$ 192	$ 15,178	$ 9,526
Consumer Loans [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts | Contract	1	1
Recorded Investment | $	$ 27	$ 1