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Discount Percentage Applied To Lot Development Appraised Values

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Discount Percentage Applied To Real Estate Appraised Values

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Fair Value Inputs, Accumulated Depreciation

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Impaired Financing Receivable, related expense

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Impaired Financing Receivable, Carrying Value

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Impaired Loan Fair Value

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Mortgage Servicing Rights Fair Value

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OREO Devaluations

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Other Real Estate, Foreclosed Assets, and Repossessed Assets, Fair Value

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Partial Charge-Offs On Impaired Loans

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Partial Charge-Offs On Impaired Loans carried at Fair Value

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Percent of OREO held at fair value

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Servicing Asset Recorded At Cost

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Ratio of the net operating income produced by an asset and its capital cost (original prices paid to buy the asset), used as an input to measure fair value.

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-Topic 820
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Percentage of adjustment to the observed price for a similar asset or liability when an identical transaction does not exist, used as an input to measure fair value.

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The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments).

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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Amount of allowance for credit losses related to recorded investment.

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Net asset value of investment in certain entities that calculate net asset value per share. Includes, but is not limited to, by unit, membership interest, or other ownership interest. Investment includes, but is not limited to, investment in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds. Excludes fair value disclosure.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.

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Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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Reflects the estimated amount of impairment as of the balance sheet date of recognized servicing assets that are being amortized in proportion to and over the period of estimated net servicing income or loss.

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Amount of increase (decrease) in the valuation allowance for impairment of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer from expenses (recoveries) recognized.

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Fair Value (Narrative) (Details) - USD ($)	3 Months Ended		12 Months Ended
Fair Value (Narrative) (Details) - USD ($)	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments Net Asset Value	$ 8,600,000		$ 8,800,000
Loans Held-for-sale, Fair Value Disclosure	6,703,000		4,148,000
Impaired Financing Receivable, Carrying Value	$ 49,115,000		55,880,000
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	$ 9,972,000		10,040,000
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	1,207,000		684,000
Impaired Financing Receivable, Related Allowance	1,207,000		684,000
Impaired Loan Fair Value	3,867,000		3,574,000
Partial Charge-Offs On Impaired Loans carried at Fair Value	2,734,000		2,780,000
Book Value Of Impaired Loans Carried At Fair Value	3,908,000		3,577,000
Impaired Financing Receivable, carried at fair value, related expense	100,000	$ 300,000
MSR recorded at lower of cost or fair value	9,969,000	9,321,000	9,688,000	$ 9,266,000
Mortgage Servicing Rights Fair Value	1,500,000		7,300,000
Valuation allowance of MSR	325,000	676,000	630,000	$ 735,000
MSRs recorded at cost	8,500,000		2,400,000
Changes due to fair value adjustments	305,000	59,000
Other Real Estate, Foreclosed Assets, and Repossessed Assets	$ 9,055,000		$ 14,190,000
Percent of OREO held at fair value	67.92932%		45.94785%
Other Real Estate, Foreclosed Assets, and Repossessed Assets, Fair Value	$ 6,200,000		$ 6,520,000
OREO valuation adjustments	207,000	$ 73,000
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	7,200,000
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired Financing Receivable, Related Allowance	41,000		3,000
Financing Receivable, not collateral dependent [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired Financing Receivable, Related Allowance	1,166,000		681,000
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	29,000		2,000
Residential Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Real Estate, Foreclosed Assets, and Repossessed Assets	$ 1,473,000		1,450,000
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			2,735,000
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			$ 712,000
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	65.70%		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	40.00%		33.00%
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	23.30%		22.70%
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	34.70%		34.70%
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	15.80%		12.50%
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	36.40%		31.80%
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	0.90%		0.90%
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	0.30%		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%		1.20%
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	11.00%		11.00%
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%		13.00%
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%		10.50%
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	9.90%		9.90%
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	13.00%		13.00%
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%		10.50%
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	9.00%		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	13.00%		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%		10.50%
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%		90.10%
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%		90.10%
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%		90.10%
Retained Earnings [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			$ 3,806,000
Accounting Standards Update 2016-01 [Member] \| Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	$ 1,200,000
Accounting Standards Update 2016-01 [Member] \| Retained Earnings [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	1,917,000
Accounting Standards Update 2016-01 [Member] \| Retained Earnings [Member] \| Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	$ 922,000