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Fair Value (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Loans Held-for-sale, Fair Value Disclosure | $ 11,517 |  | $ 7,306 |
Impaired Financing Receivable, Carrying Value | $ 73,241 |  | 76,473 |
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 | $ 28,422 |  | 28,705 |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 4,930 |  | 4,191 |
Impaired Financing Receivable, Related Allowance | 4,930 |  | 4,191 |
Impaired Loan Fair Value | 9,200 |  | 9,496 |
Partial Charge-Offs On Impaired Loans carried at Fair Value | 10,463 |  | 10,512 |
Book Value Of Impaired Loans Carried At Fair Value | 11,660 |  | 11,783 |
Impaired Financing Receivable, carried at fair value, related expense | 600 | $ 1,000 |  |
MSR recorded at lower of cost or fair value | 8,949 | 8,312 | 9,008 | $ 8,613
Mortgage Servicing Rights Fair Value | 2,500 |  | 1,900 |
Valuation allowance of MSR | 542 | 1,048 | 542 | $ 826
MSRs recorded at cost | 6,400 |  | 7,100 |
Changes due to fair value adjustments | 0 | 222 |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets | $ 17,745 |  | $ 18,651 |
Percent of OREO held at fair value | 48.57706% |  | 45.57396% |
Other Real Estate, Foreclosed Assets, and Repossessed Assets, Fair Value | $ 8,600 |  | $ 8,500 |
OREO valuation adjustments | 118 | $ 304 |  |
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Impaired Financing Receivable, Related Allowance | 2,460 |  | 2,287 |
Financing Receivable, not collateral dependent [Domain] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Impaired Financing Receivable, Related Allowance | 2,470 |  | 1,904 |
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 | $ 593 |  | 381 |
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 |  |  | $ 3,698 |
Sales Comparison Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned, Commercial [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Fair Value Inputs, Comparability Adjustments | 71.00% |  | 71.00% |
Sales Comparison Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned, Construction [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Fair Value Inputs, Comparability Adjustments | 85.00% |  | 85.00% |
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 | 45.90% |  | 45.90% |
Sales Comparison Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned, Residential [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Fair Value Inputs, Comparability Adjustments | 61.80% |  | 61.80% |
Sales Comparison Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned, Commercial [Member] | Real Estate [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Fair Value Inputs, Comparability Adjustments | 23.10% |  | 26.90% |
Sales Comparison Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned, Construction [Member] | Real Estate [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Fair Value Inputs, Comparability Adjustments | 24.40% |  | 24.30% |
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 | 15.80% |  | 20.30% |
Sales Comparison Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned, Residential [Member] | Real Estate [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Fair Value Inputs, Comparability Adjustments | 22.90% |  | 23.00% |
Sales Comparison Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned, Commercial [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Fair Value Inputs, Comparability Adjustments | 0.00% |  | 2.00% |
Sales Comparison Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned, Construction [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] | 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] | Other Real Estate Owned, Residential [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Fair Value Inputs, Comparability Adjustments | 0.10% |  | 0.10% |
Income Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned, Commercial [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Fair Value Inputs, Cap Rate | 9.50% |  | 9.50% |
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 | 13.30% |  | 13.30% |
Income Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned, Commercial [Member] | Real Estate [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Fair Value Inputs, Cap Rate | 9.50% |  | 9.50% |
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 | 10.00% |  | 9.50% |
Income Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned, Commercial [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Fair Value Inputs, Cap Rate | 9.50% |  | 9.50% |
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 | 7.00% |  | 7.00% |
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 | 50.00% |  | 50.00% |
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 | 46.30% |  | 50.00% |
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 | 20.00% |  | 50.00% |
Bulk Sale Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned, Construction [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Fair Value Inputs, Discount Rate | 15.00% |  | 15.00% |
Bulk Sale Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned, Construction [Member] | Real Estate [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Fair Value Inputs, Discount Rate | 15.00% |  | 15.00% |
Bulk Sale Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned, Construction [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Fair Value Inputs, Discount Rate | 15.00% |  | 15.00% |

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