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Income Taxes - Deferred Taxes and Liabilities (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Valuation Allowance [Line Items] |  |  |
Deferred Tax Assets, Derivative Instruments | $ 6,800,000 | $ 15,917,000 |
Deferred Tax Asset - basis in securities | 5,661,000 | 9,307,000 |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses | 1,862,000 | 2,602,000 |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost | 532,000 | 1,648,000 |
Deferred Tax Assets, Capital Loss Carryforwards | 36,000 | 56,000 |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation | 778,000 | 1,222,000 |
Tax Credit Carryforward, Amount | 200,000 |  |
Deferred Tax Assets, Other | 74,000 | 2,000 |
Deferred Tax Assets, Gross | 15,707,000 | 30,698,000 |
Deferred Tax Liabilities, Other Comprehensive Income | 12,376,000 | 16,889,000 |
Deferred Tax Liabilities, Other | 1,283,000 | 1,518,000 |
Deferred Tax Liabilities, Gross | 13,659,000 | 18,407,000 |
Deferred tax asset, net | 2,048,000 | 12,291,000 |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount | 1,365,000 | 0 | $ 0
Capital Loss Carryforward [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance | (36,000) | (56,000) |
Expired Capital Loss Carryforward [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Deferred Tax Assets, Capital Loss Carryforwards |  | 2,100,000 |
Tax Credit Carryforward, Amount | $ 0 | $ 5,900,000 |

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(15)(b)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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