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Loans and Allowance for Loan Losses, Impaired Financing Receivable (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 57,455,000	$ 27,577,000	$ 29,359,000
Unpaid principal balance	70,787,000	31,612,000	34,441,000
Related allowance	2,317,000	1,071,000	3,669,000
Average balance of nonaccrual loans	65,974,000	35,058,000	21,613,000
Interest income recognized	95,000	159,000	308,000
Collateral Dependent Impaired Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	31,533,000	14,689,000	18,958,000
Unpaid principal balance	44,746,000	14,769,000	22,935,000
Related allowance	521,000	0	0
Average balance of nonaccrual loans	33,970,000	17,420,000	11,164,000
Interest income recognized	95,000	159,000	308,000
Collateral Dependent Impaired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	13,570,000	2,308,000	4,411,000
Unpaid principal balance	16,631,000	2,312,000	5,659,000
Related allowance	38,000	0	0
Average balance of nonaccrual loans	13,839,000	2,540,000	2,253,000
Interest income recognized	0	0	0
Collateral Dependent Impaired Loans [Member] | Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	10,093,000	2,880,000	5,596,000
Unpaid principal balance	14,309,000	2,915,000	6,242,000
Related allowance	115,000	0	0
Average balance of nonaccrual loans	11,216,000	2,907,000	3,067,000
Interest income recognized	0	0	0
Collateral Dependent Impaired Loans [Member] | Construction and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	5,735,000	3,128,000	7,531,000
Unpaid principal balance	10,273,000	3,135,000	7,883,000
Related allowance	6,000	0	0
Average balance of nonaccrual loans	5,935,000	3,132,000	4,317,000
Interest income recognized	95,000	159,000	308,000
Collateral Dependent Impaired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	2,135,000	6,373,000	1,420,000
Unpaid principal balance	3,533,000	6,407,000	3,151,000
Related allowance	362,000	0	0
Average balance of nonaccrual loans	2,980,000	8,841,000	1,527,000
Interest income recognized	0	0	0
Collateral Dependent Impaired Loans [Member] | Consumer and Other [Member]
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 nonaccrual loans	0	0	0
Interest income recognized	0	0	0
Cash Flow Dependent Impaired Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	25,922,000	12,888,000	10,401,000
Unpaid principal balance	26,041,000	16,843,000	11,506,000
Related allowance	1,796,000	1,071,000	3,669,000
Average balance of nonaccrual loans	32,004,000	17,638,000	10,449,000
Interest income recognized	0	0	0
Cash Flow Dependent Impaired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	2,494,000	2,613,000	1,410,000
Unpaid principal balance	2,505,000	3,349,000	1,661,000
Related allowance	95,000	59,000	20,000
Average balance of nonaccrual loans	3,463,000	2,688,000	1,466,000
Interest income recognized	0	0	0
Cash Flow Dependent Impaired Loans [Member] | Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	8,024,000	5,193,000	3,750,000
Unpaid principal balance	8,079,000	5,775,000	4,098,000
Related allowance	411,000	688,000	616,000
Average balance of nonaccrual loans	10,076,000	5,966,000	3,815,000
Interest income recognized	0	0	0
Cash Flow Dependent Impaired Loans [Member] | Construction and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	233,000	3,485,000	76,000
Unpaid principal balance	233,000	4,154,000	125,000
Related allowance	12,000	20,000	12,000
Average balance of nonaccrual loans	438,000	3,476,000	87,000
Interest income recognized	0	0	0
Cash Flow Dependent Impaired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	15,171,000	1,122,000	263,000
Unpaid principal balance	15,224,000	2,714,000	281,000
Related allowance	1,278,000	77,000	19,000
Average balance of nonaccrual loans	18,027,000	2,884,000	168,000
Interest income recognized	0	0	0
Cash Flow Dependent Impaired Loans [Member] | Consumer and Other [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	0	475,000	4,902,000
Unpaid principal balance	0	851,000	5,341,000
Related allowance	0	227,000	3,002,000
Average balance of nonaccrual loans	0	2,624,000	4,913,000
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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
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Amount of allowance for credit losses related to recorded investment.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
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