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Fair Value (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Loans Held-for-sale, Fair Value Disclosure | $ 6,722,000 |  | $ 10,413,000 |
Impaired Financing Receivable, Carrying Value | $ 69,036,000 |  | 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 | $ 23,731,000 |  | 24,943,000 |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 1,091,000 |  | 548,000 |
Impaired Financing Receivable, Related Allowance | 1,091,000 |  | 548,000 |
Impaired Loan Fair Value | 4,319,000 |  | 5,983,000 |
Partial Charge-Offs On Impaired Loans carried at Fair Value | 2,593,000 |  | 3,681,000 |
Book Value Of Impaired Loans Carried At Fair Value | 4,805,000 |  | 6,379,000 |
Impaired Financing Receivable, carried at fair value, related expense | 300,000 | $ 600,000 |  |
MSR recorded at lower of cost or fair value | 9,321,000 | 8,949,000 | 9,266,000 | $ 9,008,000
Mortgage Servicing Rights Fair Value | 6,900,000 |  | 6,800,000 |
Valuation allowance of MSR | 676,000 | 542,000 | 735,000 | $ 542,000
MSRs recorded at cost | 2,400,000 |  | 2,500,000 |
Changes due to fair value adjustments | (59,000) | 0 |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets | $ 13,693,000 |  | 13,926,000 |
Percent of OREO held at fair value | 49.86489% |  |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets, Fair Value | $ 6,800,000 |  | 6,897,000 |
OREO valuation adjustments | 73,000 | $ 118,000 |  |
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Impaired Financing Receivable, Related Allowance | 486,000 |  | 396,000 |
Financing Receivable, not collateral dependent [Domain] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Impaired Financing Receivable, Related Allowance | 605,000 |  | 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 | 179,000 |  | 309,000 |
Residential Real Estate [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets | $ 1,418,000 |  | 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 | 90.00% |  | 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 | 110.00% |  | 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 | 21.30% |  | 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 | 26.50% |  | 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 | 16.50% |  | 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 | 35.00% |  | 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 | 0.30% |  | 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 | 0.60% |  | 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 | 10.60% |  | 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 | 14.00% |  | 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 | 10.00% |  | 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 | 13.10% |  | 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 | 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% |  | 10.00% |
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 | 60.50% |  | 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 | 17.00% |  | 17.00% |

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