Loans and Allowance for Loan Losses - Loan Risk Rating (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 1,867,747	$ 1,777,239
Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	890,462	860,027
Consumer Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	405,531	407,254
Construction and Land Development [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	219,751	187,895
Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	341,207	308,254
Consumer and Other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	10,796	13,809
Non PCI Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,837,276	1,743,081
Non PCI Loans [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,802,230	1,728,896
Non PCI Loans [Member] | Watch [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	30,630	10,758
Non PCI Loans [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,266	309
Non PCI Loans [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,953	2,915
Non PCI Loans [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	197	203
Non PCI Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	872,582	842,345
Non PCI Loans [Member] | Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	856,238	834,912
Non PCI Loans [Member] | Commercial Real Estate [Member] | Watch [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	15,488	6,791
Non PCI Loans [Member] | Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	489	0
Non PCI Loans [Member] | Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	367	642
Non PCI Loans [Member] | Commercial Real Estate [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Non PCI Loans [Member] | Consumer Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	398,362	398,542
Non PCI Loans [Member] | Consumer Real Estate [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	394,525	394,728
Non PCI Loans [Member] | Consumer Real Estate [Member] | Watch [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,503	2,678
Non PCI Loans [Member] | Consumer Real Estate [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	9	14
Non PCI Loans [Member] | Consumer Real Estate [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,159	1,122
Non PCI Loans [Member] | Consumer Real Estate [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	166	0
Non PCI Loans [Member] | Construction and Land Development [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	215,122	183,293
Non PCI Loans [Member] | Construction and Land Development [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	209,029	182,524
Non PCI Loans [Member] | Construction and Land Development [Member] | Watch [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,164	64
Non PCI Loans [Member] | Construction and Land Development [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	155	158
Non PCI Loans [Member] | Construction and Land Development [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	774	547
Non PCI Loans [Member] | Construction and Land Development [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Non PCI Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	340,773	305,697
Non PCI Loans [Member] | Commercial and Industrial [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	332,165	303,805
Non PCI Loans [Member] | Commercial and Industrial [Member] | Watch [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	7,433	1,090
Non PCI Loans [Member] | Commercial and Industrial [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	612	137
Non PCI Loans [Member] | Commercial and Industrial [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	556	462
Non PCI Loans [Member] | Commercial and Industrial [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	7	203
Non PCI Loans [Member] | Consumer and Other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	10,437	13,204
Non PCI Loans [Member] | Consumer and Other [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	10,273	12,927
Non PCI Loans [Member] | Consumer and Other [Member] | Watch [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	42	135
Non PCI Loans [Member] | Consumer and Other [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1	0
Non PCI Loans [Member] | Consumer and Other [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	97	142
Non PCI Loans [Member] | Consumer and Other [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	24	0
Purchased Credit Impaired Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	30,471	34,158
Purchased Credit Impaired Loans [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	19,623	26,623
Purchased Credit Impaired Loans [Member] | Watch [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	7,009	3,147
Purchased Credit Impaired Loans [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,326	1,536
Purchased Credit Impaired Loans [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,513	2,852
Purchased Credit Impaired Loans [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	17,880	17,682
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	13,760	14,050
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] | Watch [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,497	1,805
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	886	1,030
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	737	797
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	7,169	8,712
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	4,969	5,617
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] | Watch [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	383	756
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	435	446
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,382	1,893
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	4,629	4,602
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	516	4,033
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member] | Watch [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	4,113	569
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	434	2,557
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	53	2,382
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] | Watch [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1	0
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	50
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	380	125
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	359	605
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	325	541
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] | Watch [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	15	17
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5	10
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	14	37
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 0	$ 0