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Loans and Allowance for Loan Losses - Loans Restructured as TDRs, Excluding Loans Acquired, Segregated by Class of Loans (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) loan	Sep. 30, 2018 USD ($) loan	Sep. 30, 2019 USD ($) loan	Sep. 30, 2018 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	1	6	1	8
Balance Prior to TDR	$ 330	$ 2,854	$ 330	$ 3,006
Balance	330	2,846	330	2,999
Financial Impact on Date of Restructure	0	402	0	402
Change in Maturity Date
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	330	2,846	330	2,999
Change in Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	$ 0	$ 0	$ 0	$ 0
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan				1
Balance Prior to TDR				$ 91
Balance				91
Financial Impact on Date of Restructure				0
Consumer | Change in Maturity Date
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance				91
Consumer | Change in Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance				$ 0
Consumer | Other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan				1
Balance Prior to TDR				$ 91
Balance				91
Financial Impact on Date of Restructure				0
Consumer | Other consumer | Change in Maturity Date
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance				91
Consumer | Other consumer | Change in Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance				$ 0
Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	1	3	1	4
Balance Prior to TDR	$ 330	$ 491	$ 330	$ 552
Balance	330	488	330	550
Financial Impact on Date of Restructure	0	212	0	212
Real Estate | Change in Maturity Date
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	330	488	330	550
Real Estate | Change in Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	$ 0	$ 0	$ 0	$ 0
Real Estate | Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		1		1
Balance Prior to TDR		$ 99		$ 99
Balance		98		98
Financial Impact on Date of Restructure		0		0
Real Estate | Construction | Change in Maturity Date
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance		98		98
Real Estate | Construction | Change in Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance		$ 0		$ 0
Real Estate | Single family residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	1		1	1
Balance Prior to TDR	$ 330		$ 330	$ 61
Balance	330		330	62
Financial Impact on Date of Restructure	0		0	0
Real Estate | Single family residential | Change in Maturity Date
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	330		330	62
Real Estate | Single family residential | Change in Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance	$ 0		$ 0	$ 0
Real Estate | Other commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		2		2
Balance Prior to TDR		$ 392		$ 392
Balance		390		390
Financial Impact on Date of Restructure		212		212
Real Estate | Other commercial | Change in Maturity Date
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance		390		390
Real Estate | Other commercial | Change in Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance		$ 0		$ 0
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		3		3
Balance Prior to TDR		$ 2,363		$ 2,363
Balance		2,358		2,358
Financial Impact on Date of Restructure		190		190
Commercial | Change in Maturity Date
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance		2,358		2,358
Commercial | Change in Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance		$ 0		$ 0
Commercial | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		3		3
Balance Prior to TDR		$ 2,363		$ 2,363
Balance		2,358		2,358
Financial Impact on Date of Restructure		190		190
Commercial | Commercial | Change in Maturity Date
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance		2,358		2,358
Commercial | Commercial | Change in Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Balance		$ 0		$ 0

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-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
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