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Loans and Allowance for Loan Losses, Impaired Financing Receivable (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 83,146,000	$ 58,979,000	$ 33,750,000
Unpaid principal balance	83,337,000	59,354,000	34,242,000
Related allowance	3,964,000	2,198,000	1,092,000
Average balance of impaired loans	75,257,000	40,830,000	32,474,000
Interest income recognized	469,000	95,000	159,000
Impaired loans with an allowance
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	44,794,000	24,921,000	8,396,000
Unpaid principal balance	44,914,000	25,114,000	8,754,000
Related allowance	3,964,000	2,198,000	1,092,000
Average balance of impaired loans	34,615,000	17,191,000	15,473,000
Interest income recognized	0	0	0
Impaired loans with an allowance | Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	14,114,000	1,850,000	442,000
Unpaid principal balance	14,124,000	1,863,000	452,000
Related allowance	724,000	95,000	60,000
Average balance of impaired loans	10,260,000	650,000	537,000
Interest income recognized	0	0	0
Impaired loans with an allowance | Consumer Real Estate
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	19,864,000	8,028,000	3,300,000
Unpaid principal balance	19,991,000	8,079,000	3,303,000
Related allowance	1,443,000	410,000	690,000
Average balance of impaired loans	13,154,000	4,990,000	6,503,000
Interest income recognized	0	0	0
Impaired loans with an allowance | Construction and Land Development
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	581,000	2,522,000	84,000
Unpaid principal balance	579,000	2,528,000	129,000
Related allowance	28,000	66,000	20,000
Average balance of impaired loans	1,157,000	567,000	77,000
Interest income recognized	0	0	0
Impaired loans with an allowance | Commercial and Industrial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	9,252,000	12,521,000	4,054,000
Unpaid principal balance	9,215,000	12,644,000	4,051,000
Related allowance	1,441,000	1,627,000	95,000
Average balance of impaired loans	9,326,000	10,559,000	5,868,000
Interest income recognized	0	0	0
Impaired loans with an allowance | Consumer and Other
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	983,000	0	516,000
Unpaid principal balance	1,005,000	0	819,000
Related allowance	328,000	0	227,000
Average balance of impaired loans	718,000	425,000	2,488,000
Interest income recognized	0	0	0
Impaired loans without an allowance
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	38,352,000	34,058,000	25,354,000
Unpaid principal balance	38,423,000	34,240,000	25,488,000
Related allowance	0	0	0
Average balance of impaired loans	40,642,000	23,639,000	17,001,000
Interest income recognized	469,000	95,000	159,000
Impaired loans without an allowance | Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	14,724,000	16,364,000	2,308,000
Unpaid principal balance	14,739,000	16,514,000	2,312,000
Related allowance	0	0	0
Average balance of impaired loans	17,906,000	6,983,000	2,346,000
Interest income recognized	469,000	0	0
Impaired loans without an allowance | Consumer Real Estate
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	7,247,000	4,144,000	5,641,000
Unpaid principal balance	7,271,000	4,174,000	5,674,000
Related allowance	0	0	0
Average balance of impaired loans	5,477,000	5,727,000	2,065,000
Interest income recognized	0	0	0
Impaired loans without an allowance | Construction and Land Development
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	1,786,000	2,645,000	3,128,000
Unpaid principal balance	1,786,000	2,650,000	3,135,000
Related allowance	0	0	0
Average balance of impaired loans	1,463,000	1,890,000	3,403,000
Interest income recognized	0	95,000	159,000
Impaired loans without an allowance | Commercial and Industrial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	14,595,000	10,905,000	14,277,000
Unpaid principal balance	14,627,000	10,902,000	14,367,000
Related allowance	0	0	0
Average balance of impaired loans	15,796,000	9,039,000	9,187,000
Interest income recognized	0	0	0
Impaired loans without an allowance | Consumer and Other
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	0	0	0
Unpaid principal balance	0	0	0
Related allowance	0	0	0
Average balance of impaired loans	0	0	0
Interest income recognized	$ 0	$ 0	$ 0

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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