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Fair Value (Narrative) (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Alternative Investment | $ 70,129,000 |  | $ 70,129,000 |  | $ 63,746,000 |  |  |
Loans Held-for-sale, Fair Value Disclosure | 8,154,000 |  | 8,154,000 |  | 4,148,000 |  |  |
Impaired Financing Receivable, Carrying Value | 60,354,000 |  | $ 60,354,000 |  | 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 |  |  | $ 11,384,000 |  | 10,040,000 |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 1,396,000 |  | 1,396,000 |  | 684,000 |  |  |
Impaired Financing Receivable, Related Allowance | 1,396,000 |  | 1,396,000 |  | 684,000 |  |  |
Impaired Loan Fair Value | 6,470,000 |  | 6,470,000 |  | 3,574,000 |  |  |
Partial Charge-Offs On Impaired Loans carried at Fair Value |  |  | 4,075,000 |  | 2,780,000 |  |  |
Book Value Of Impaired Loans Carried At Fair Value | 6,499,000 |  | 6,499,000 |  | 3,577,000 |  |  |
Impaired Financing Receivable, carried at fair value, related expense | 200,000 | $ 100,000 | 300,000 | $ 500,000 |  |  |  |
MSR recorded at lower of cost or fair value | 10,077,000 | 9,476,000 | 10,077,000 | 9,476,000 | 9,688,000 | $ 9,969,000 | $ 9,321,000 | $ 9,266,000
Mortgage Servicing Rights Fair Value | 900,000 |  | 900,000 |  | 7,300,000 |  |  |
Valuation allowance of MSR | 248,000 | 635,000 | 248,000 | 635,000 | 630,000 | $ 325,000 | $ 676,000 | $ 735,000
MSRs recorded at cost | 9,200,000 |  | 9,200,000 |  | 2,400,000 |  |  |
Changes due to fair value adjustments | 77,000 | 41,000 | 382,000 | 100,000 |  |  |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets | $ 5,729,000 |  | $ 5,729,000 |  | $ 14,190,000 |  |  |
Percent of OREO held at fair value | 75.144% |  | 75.144% |  | 45.94785% |  |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets, Fair Value | $ 4,300,000 |  | $ 4,300,000 |  | $ 6,520,000 |  |  |
OREO valuation adjustments | 114,000 | $ 272,000 | 321,000 | $ 345,000 |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 7,100,000 |  | 7,100,000 |  | 7,200,000 |  |  |
Alternative Investment, income recognized |  |  | 752,000 |  |  |  |  |
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Related Allowance | 29,000 |  | 29,000 |  | 3,000 |  |  |
Financing Receivable, not collateral dependent [Domain] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Related Allowance | 1,367,000 |  | 1,367,000 |  | 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 | 27,000 |  | 27,000 |  | 2,000 |  |  |
Construction Real Estate [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 |  | 0 |  | 0 |  |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets | 2,425,000 |  | 2,425,000 |  | 4,852,000 |  |  |
Residential Real Estate [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets | 1,009,000 |  | 1,009,000 |  | 1,450,000 |  |  |
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 |  | 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 |  | 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 |  | 922,000 |  |  |  |  |
Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Alternative Investment | 9,400,000 |  | 9,400,000 |  | 8,800,000 |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Loan Fair Value | $ 6,470,000 |  | $ 6,470,000 |  | $ 3,574,000 |  |  |
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Maximum [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Loans Receivable, Measurement Input | 0.550 |  | 0.550 |  | 0.900 |  |  |
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Maximum [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Other Real Estate Owned, Measurement Input | 0.684 |  | 0.684 |  | 0.684 |  |  |
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Maximum [Member] | Construction Real Estate [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Loans Receivable, Measurement Input | 0.900 |  | 0.900 |  | 0.048 |  |  |
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Maximum [Member] | Construction Real Estate [Member] | Real Estate [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Other Real Estate Owned, Measurement Input | 0.450 |  | 0.450 |  | 0.900 |  |  |
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Maximum [Member] | Residential Real Estate [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Loans Receivable, Measurement Input | 0.400 |  | 0.400 |  | 0.330 |  |  |
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Maximum [Member] | Residential Real Estate [Member] | Real Estate [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Other Real Estate Owned, Measurement Input | 0.546 |  | 0.546 |  | 0.797 |  |  |
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Weighted Average [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Loans Receivable, Measurement Input | 0.254 |  | 0.254 |  | 0.227 |  |  |
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Weighted Average [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Other Real Estate Owned, Measurement Input | 0.347 |  | 0.347 |  | 0.347 |  |  |
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Weighted Average [Member] | Construction Real Estate [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Loans Receivable, Measurement Input | 0.261 |  | 0.261 |  | 0.024 |  |  |
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Weighted Average [Member] | Construction Real Estate [Member] | Real Estate [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Other Real Estate Owned, Measurement Input | 0.217 |  | 0.217 |  | 0.245 |  |  |
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Weighted Average [Member] | Residential Real Estate [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Loans Receivable, Measurement Input | 0.185 |  | 0.185 |  | 0.125 |  |  |
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Weighted Average [Member] | Residential Real Estate [Member] | Real Estate [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Other Real Estate Owned, Measurement Input | 0.332 |  | 0.332 |  | 0.318 |  |  |
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Minimum [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Loans Receivable, Measurement Input | 0.000 |  | 0.000 |  | 0.000 |  |  |
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Minimum [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Other Real Estate Owned, Measurement Input | 0.009 |  | 0.009 |  | 0.009 |  |  |
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Minimum [Member] | Construction Real Estate [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Loans Receivable, Measurement Input | 0.050 |  | 0.050 |  | 0.000 |  |  |
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Minimum [Member] | Construction Real Estate [Member] | Real Estate [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Other Real Estate Owned, Measurement Input | 0.000 |  | 0.000 |  | 0.000 |  |  |
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Minimum [Member] | Residential Real Estate [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Loans Receivable, Measurement Input | 0.017 |  | 0.017 |  | 0.003 |  |  |
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Minimum [Member] | Residential Real Estate [Member] | Real Estate [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Other Real Estate Owned, Measurement Input | 0.004 |  | 0.004 |  | 0.012 |  |  |
Measurement Input, Cap Rate [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Income Approach [Member] | Maximum [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Loans Receivable, Measurement Input | 0.118 |  | 0.118 |  | 0.110 |  |  |
Measurement Input, Cap Rate [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Income Approach [Member] | Maximum [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Other Real Estate Owned, Measurement Input | 0.130 |  | 0.130 |  | 0.130 |  |  |
Measurement Input, Cap Rate [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Income Approach [Member] | Maximum [Member] | Residential Real Estate [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Loans Receivable, Measurement Input | 0.105 |  | 0.105 |  | 0.105 |  |  |
Measurement Input, Cap Rate [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Income Approach [Member] | Weighted Average [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Loans Receivable, Measurement Input | 0.115 |  | 0.115 |  | 0.099 |  |  |
Measurement Input, Cap Rate [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Income Approach [Member] | Weighted Average [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Other Real Estate Owned, Measurement Input | 0.130 |  | 0.130 |  | 0.130 |  |  |
Measurement Input, Cap Rate [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Income Approach [Member] | Weighted Average [Member] | Residential Real Estate [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Loans Receivable, Measurement Input | 0.105 |  | 0.105 |  | 0.105 |  |  |
Measurement Input, Cap Rate [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Income Approach [Member] | Minimum [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Loans Receivable, Measurement Input | 0.106 |  | 0.106 |  | 0.090 |  |  |
Measurement Input, Cap Rate [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Income Approach [Member] | Minimum [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Other Real Estate Owned, Measurement Input | 0.130 |  | 0.130 |  | 0.130 |  |  |
Measurement Input, Cap Rate [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Income Approach [Member] | Minimum [Member] | Residential Real Estate [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Loans Receivable, Measurement Input | 0.105 |  | 0.105 |  | 0.105 |  |  |
Measurement input replacement cost [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Cost Approach [Member] | Maximum [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Loans Receivable, Measurement Input | 0.901 |  | 0.901 |  | 0.901 |  |  |
Measurement input replacement cost [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Cost Approach [Member] | Weighted Average [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Loans Receivable, Measurement Input | 0.131 |  | 0.131 |  | 0.901 |  |  |
Measurement input replacement cost [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Cost Approach [Member] | Minimum [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Loans Receivable, Measurement Input | 0.037 |  | 0.037 |  | 0.901 |  |  |

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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=SL6742756-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 54B -URI http://asc.fasb.org/extlink&oid=99392525&loc=SL7495116-110257 + Details
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