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Summary of Significant Accounting Policies (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Property, Plant and Equipment [Line Items] |  |  |
Number of reportable segments | segment | 1 |  |
Required reserves on deposits maintained | $ 17.5 | $ 18.2 |
Minimum period of consecutive contractual payments to no longer be considered in nonaccrual status | 6 years |  |
Removal of remaining clawback liability, FDIC loss share termination |  |  | $ 3.5
Removal of remaining FDIC receivable, FDIC loss share termination |  |  | $ 7.2
Finite-lived intangible assets useful life | 10 years | 10 years |
Furniture, Fixtures and Equipment [Member] | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property plant and equipment useful life | 3 years |  |
Furniture, Fixtures and Equipment [Member] | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property plant and equipment useful life | 10 years |  |
Building and Leasehold Improvements [Member] | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property plant and equipment useful life | 10 years |  |
Building and Leasehold Improvements [Member] | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property plant and equipment useful life | 40 years |  |
Software [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property plant and equipment useful life | 3 years |  |
Core Deposits [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Finite-lived intangible assets useful life | 10 years |  |
State and Local Jurisdiction [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Right to receive state tax credit at agreed upon rates | 10 years |  |

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