Fair Value (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 11,396,000		$ 11,396,000		$ 10,413,000
Impaired Financing Receivable, Carrying Value	68,507,000		$ 68,507,000		69,878,000
Discount percentage applied to real estate appraised values			15.00%
Discount percentage applied to lot development appraised values			6.00%
Partial Charge-Offs On Impaired Loans			$ 9,946,000		24,943,000
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	5,102,000		5,102,000		548,000
Impaired Financing Receivable, Related Allowance	5,102,000		5,102,000		548,000
Impaired Loan Fair Value	7,137,000		7,137,000		5,983,000
Partial Charge-Offs On Impaired Loans carried at Fair Value			2,822,000		3,681,000
Book Value Of Impaired Loans Carried At Fair Value	7,470,000		7,470,000		6,379,000
Impaired Financing Receivable, carried at fair value, related expense	(700,000)	$ 2,900,000	(1,200,000)	$ 1,900,000
MSR recorded at lower of cost or fair value	9,479,000	8,745,000	9,479,000	8,745,000	9,266,000	$ 9,476,000	$ 8,880,000	$ 9,008,000
Mortgage Servicing Rights Fair Value	7,100,000		7,100,000		6,800,000
Valuation allowance of MSR	743,000	1,111,000	743,000	1,111,000	735,000	$ 635,000	$ 751,000	$ 542,000
MSRs recorded at cost	2,400,000		2,400,000		2,500,000
Changes due to fair value adjustments	(108,000)	(360,000)	(8,000)	(569,000)
Other Real Estate, Foreclosed Assets, and Repossessed Assets	$ 14,366,000		$ 14,366,000		$ 13,926,000
Percent of OREO held at fair value	47.06947%		47.06947%		49.52607%
Other Real Estate, Foreclosed Assets, and Repossessed Assets, Fair Value	$ 6,800,000		$ 6,800,000		$ 6,897,000
OREO valuation adjustments	22,000	$ 233,000	367,000	$ 572,000
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired Financing Receivable, Related Allowance	333,000		333,000		396,000
Financing Receivable, not collateral dependent [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired Financing Receivable, Related Allowance	4,769,000		4,769,000		152,000
Commercial Real Estate Portfolio Segment [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	320,000		320,000		309,000
Residential Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Real Estate, Foreclosed Assets, and Repossessed Assets	$ 1,456,000		$ 1,456,000		1,660,000
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired Loan Fair Value					3,057,000
Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired Loan Fair Value					$ 2,385,000
Sales Comparison Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments			102.00%		90.00%
Sales Comparison Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments			68.40%		68.40%
Sales Comparison Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments			33.00%		110.00%
Sales Comparison Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments			79.70%		79.70%
Sales Comparison Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments			40.10%		20.20%
Sales Comparison Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments			28.90%		26.50%
Sales Comparison Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments			11.70%		17.00%
Sales Comparison Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments			30.80%		30.60%
Sales Comparison Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments			0.00%		0.00%
Sales Comparison Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments			0.00%		0.00%
Sales Comparison Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments			0.10%		0.30%
Sales Comparison Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments			1.20%		3.20%
Income Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Cap Rate			12.50%		10.60%
Income Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Cap Rate			13.00%		14.00%
Income Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Cap Rate			10.50%		10.00%
Income Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Cap Rate			9.40%		10.10%
Income Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Cap Rate			12.90%		13.10%
Income Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Cap Rate			10.50%		10.00%
Income Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Cap Rate			8.80%		9.00%
Income Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Cap Rate			12.00%		13.00%
Income Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Cap Rate			10.50%		10.00%
Cost Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Accumulated Depreciation			90.10%		18.00%
Cost Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Accumulated Depreciation			90.10%		17.80%
Cost Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Accumulated Depreciation			90.10%		17.00%