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Investment Securities - Amortized Cost and Fair Value of Investment Securities Portfolio Expected Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Due from one to five years, Available for sale, Amortized Cost	$ 31,323
Due from five to ten years, Available for sale, Amortized Cost	20,556
Due from ten years and greater, Available for sale, Amortized Cost	4,049
Available for sale, Amortized Cost	55,928	$ 39,730
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Due from one to five years, Available for sale, Fair Value	31,214
Due from five to ten years, Available for sale, Fair Value	20,473
Due from ten years and greater, Available for sale, Fair Value	4,010
Available for sale, Fair value	55,697	39,277
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Due from one to five years, Held to Maturity, Amortized Cost	2,781
Due from five to ten years, Held to Maturity, Amortized Cost	2,410
Held to maturity, Amortized Cost	5,191	6,214
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Due from one to five years, Held to Maturity, Fair Value	2,930
Due from five to ten years, Held to Maturity, Fair Value	2,555
Held to Maturity, Fair Value	$ 5,485	$ 6,553

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- Definition

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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

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