Loans and Allowance for Loan Losses - Loans Restructured as TDRs, Excluding Loans Acquired, Segregated by Class of Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans | loan	4	8
Balance Prior to TDR	$ 997	$ 3,006
Balance	996	2,999
Financial Impact on Date of Restructure	$ 0	$ 402
Loans, Excluding Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans | loan	30	33
Change in Maturity Date
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 996	$ 2,999
Change in Rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 0	$ 0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans | loan		1
Balance Prior to TDR		$ 91
Balance		91
Financial Impact on Date of Restructure		0
Consumer | Change in Maturity Date
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance		91
Consumer | Change in Rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance		$ 0
Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans | loan		1
Balance Prior to TDR		$ 91
Balance		91
Financial Impact on Date of Restructure		0
Consumer | Other consumer | Change in Maturity Date
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance		91
Consumer | Other consumer | Change in Rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance		$ 0
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans | loan	4	4
Balance Prior to TDR	$ 997	$ 552
Balance	996	550
Financial Impact on Date of Restructure	$ 0	$ 212
Real Estate | Loans, Excluding Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans | loan	23	23
Real Estate | Change in Maturity Date
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 996	$ 550
Real Estate | Change in Rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 0	$ 0
Real Estate | Construction and development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans | loan		1
Balance Prior to TDR		$ 99
Balance		98
Financial Impact on Date of Restructure		$ 0
Real Estate | Construction and development | Loans, Excluding Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans | loan	1	3
Real Estate | Construction and development | Change in Maturity Date
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance		$ 98
Real Estate | Construction and development | Change in Rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance		$ 0
Real Estate | Single family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans | loan	4	1
Balance Prior to TDR	$ 997	$ 61
Balance	996	62
Financial Impact on Date of Restructure	$ 0	$ 0
Real Estate | Single family residential | Loans, Excluding Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans | loan	19	16
Real Estate | Single family residential | Change in Maturity Date
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 996	$ 62
Real Estate | Single family residential | Change in Rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 0	$ 0
Real Estate | Other commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans | loan		2
Balance Prior to TDR		$ 392
Balance		390
Financial Impact on Date of Restructure		$ 212
Real Estate | Other commercial | Loans, Excluding Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans | loan	3	4
Real Estate | Other commercial | Change in Maturity Date
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance		$ 390
Real Estate | Other commercial | Change in Rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance		$ 0
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans | loan		3
Balance Prior to TDR		$ 2,363
Balance		2,358
Financial Impact on Date of Restructure		$ 190
Commercial | Loans, Excluding Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans | loan	7	10
Commercial | Change in Maturity Date
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance		$ 2,358
Commercial | Change in Rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance		$ 0
Commercial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans | loan		3
Balance Prior to TDR		$ 2,363
Balance		2,358
Financial Impact on Date of Restructure		$ 190
Commercial | Commercial | Loans, Excluding Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans | loan	7	10
Commercial | Commercial | Change in Maturity Date
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance		$ 2,358
Commercial | Commercial | Change in Rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance		$ 0