Securities - Reconciliation from Amortized Cost to Estimated Fair Value of Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Available for sale at fair value:
Amortized cost	$ 43,830	$ 52,869
Gross unrealized gains	826	679
Gross unrealized losses	(470)	(683)
Securities available for sale	44,186	52,865
Held to maturity at cost:
Amortized cost	28,174	18,471
Gross unrealized gains	674	328
Gross unrealized losses	(10)	(192)
Estimated fair value	28,838	18,607
U.S. Government sponsored entities
Available for sale at fair value:
Amortized cost	3,748	6,649
Gross unrealized gains	53	0
Gross unrealized losses	0	(68)
Securities available for sale	3,801	6,581
Held to maturity at cost:
Amortized cost	3,773	3,988
Gross unrealized gains	6	0
Gross unrealized losses	0	(87)
Estimated fair value	3,779	3,901
State and political subdivisions
Available for sale at fair value:
Amortized cost	5,557	10,625
Gross unrealized gains	72	159
Gross unrealized losses	0	(2)
Securities available for sale	5,629	10,782
Held to maturity at cost:
Amortized cost	2,307	2,364
Gross unrealized gains	267	187
Gross unrealized losses	0	(1)
Estimated fair value	2,574	2,550
Residential mortgage-backed securities
Available for sale at fair value:
Amortized cost	22,937	26,191
Gross unrealized gains	621	449
Gross unrealized losses	(99)	(201)
Securities available for sale	23,459	26,439
Held to maturity at cost:
Amortized cost	5,181	6,232
Gross unrealized gains	170	141
Gross unrealized losses	(10)	(28)
Estimated fair value	5,341	6,345
Commercial mortgage-backed securities
Held to maturity at cost:
Amortized cost	3,823	3,902
Gross unrealized gains	90	0
Gross unrealized losses	0	(62)
Estimated fair value	3,913	3,840
Corporate and other securities
Available for sale at fair value:
Amortized cost	11,588	9,404
Gross unrealized gains	80	71
Gross unrealized losses	(371)	(412)
Securities available for sale	11,297	9,063
Held to maturity at cost:
Amortized cost	13,090	1,985
Gross unrealized gains	141	0
Gross unrealized losses	0	(14)
Estimated fair value	$ 13,231	$ 1,971

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

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value of investments in debt securities classified as held-to-maturity.

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