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Fair Value Disclosures - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Available for sale securities:
Available for Sale Securities, Fair Value	$ 255,609	$ 275,029
Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Available for Sale Securities, Fair Value	255,609	275,029
Mutual Fund
Available for sale securities:
Securities available for sale	5,006	2,011
Mutual Fund | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Securities available for sale	5,006	2,011
U.S. Government Agency Obligations
Available for sale securities:
Securities available for sale	109,890	180,942
U.S. Government Agency Obligations | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Securities available for sale	109,890	180,942
U.S. Treasury notes | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Securities available for sale	1,934
Mortgage-backed Securities, Residential
Available for sale securities:
Securities available for sale	33,663	24,990
Mortgage-backed Securities, Residential | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Securities available for sale	33,663	24,990
Asset Backed Securities
Available for sale securities:
Securities available for sale	11,845	12,902
Asset Backed Securities | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Securities available for sale	11,845	12,902
State and Municipal
Available for sale securities:
Securities available for sale	74,391	26,637
State and Municipal | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Securities available for sale	74,391	26,637
Corporate Bonds
Available for sale securities:
Securities available for sale	15,320	27,390
Corporate Bonds | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Securities available for sale	15,320	27,390
SBA Pooled Securities
Available for sale securities:
Securities available for sale	3,560	157
SBA Pooled Securities | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Securities available for sale	3,560	157
Level 1 | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Available for Sale Securities, Fair Value	5,006	2,011
Level 1 | Mutual Fund | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Securities available for sale	5,006	2,011
Level 2 | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Available for Sale Securities, Fair Value	250,603	273,018
Level 2 | U.S. Government Agency Obligations | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Securities available for sale	109,890	180,942
Level 2 | U.S. Treasury notes | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Securities available for sale	1,934
Level 2 | Mortgage-backed Securities, Residential | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Securities available for sale	33,663	24,990
Level 2 | Asset Backed Securities | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Securities available for sale	11,845	12,902
Level 2 | State and Municipal | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Securities available for sale	74,391	26,637
Level 2 | Corporate Bonds | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Securities available for sale	15,320	27,390
Level 2 | SBA Pooled Securities | Fair Value, Measurements, Recurring [Member]
Available for sale securities:
Securities available for sale	$ 3,560	$ 157

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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