Investment Securities Held-to-maturity Securities by Maturities (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investments [Abstract]
Federal income tax rate	34.10%	35.00%	35.00%
Schedule of Held-to-maturity Securities
Amortized cost of securities maturing within 1 year	$ 0
Amortized cost of securities maturing in 1-5 years	324
Amortized cost of securities maturing in 5-10 years	1,463
Amortized cost of securities maturing in over 10 years	43,941
Amortized Cost	45,728	$ 48,468
Fair value of securities maturing within 1 year	0
Fair value of securities maturing in 1-5 years	319
Fair value of securities maturing in 5-10 years	1,592
Fair value of securities maturing in over 10 years	43,942
Fair Value	$ 45,853	48,442
Average yield of securities maturing within 1 year	0.00%
Average yield of securities maturing in 1-5 years	3.14%
Average yield of securities maturing in 5-10 years	1.72%
Average yield of securities maturing in over 10 years	2.60%
Total average yield	2.57%
States and political subdivisions
Schedule of Held-to-maturity Securities
Amortized cost of securities maturing within 1 year	$ 0
Amortized cost of securities maturing in 1-5 years	324
Amortized cost of securities maturing in 5-10 years	976
Amortized cost of securities maturing in over 10 years	2,531
Amortized Cost	3,831	3,841
Fair value of securities maturing within 1 year	0
Fair value of securities maturing in 1-5 years	319
Fair value of securities maturing in 5-10 years	1,109
Fair value of securities maturing in over 10 years	2,793
Fair Value	4,221	4,282
Residential mortgage-backed securities
Schedule of Held-to-maturity Securities
Amortized cost of securities maturing within 1 year	0
Amortized cost of securities maturing in 1-5 years	0
Amortized cost of securities maturing in 5-10 years	487
Amortized cost of securities maturing in over 10 years	34,880
Amortized Cost	35,367	36,945
Fair value of securities maturing within 1 year	0
Fair value of securities maturing in 1-5 years	0
Fair value of securities maturing in 5-10 years	483
Fair value of securities maturing in over 10 years	34,713
Fair Value	35,196	36,740
Commercial mortgage-backed securities
Schedule of Held-to-maturity Securities
Amortized cost of securities maturing within 1 year	0
Amortized cost of securities maturing in 1-5 years	0
Amortized cost of securities maturing in 5-10 years	0
Amortized cost of securities maturing in over 10 years	6,530
Amortized Cost	6,530	7,682
Fair value of securities maturing within 1 year	0
Fair value of securities maturing in 1-5 years	0
Fair value of securities maturing in 5-10 years	0
Fair value of securities maturing in over 10 years	6,436
Fair Value	$ 6,436	$ 7,420

Held-to-maturity Securities, Debt Maturities, Average Yield

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Held-to-maturity Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost before Other than Temporary Impairment

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Held-to-maturity Securities, Debt Maturities, Next Rolling Twelve Months, Average Yield

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Held-to-maturity Securities, Debt Maturities, Rolling after Ten Years, Amortized Cost before Other than Temporary Impairment

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Held-to-maturity Securities, Debt Maturities, Rolling after Ten Years, Average Yield

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Held-to-maturity Securities, Debt Maturities, Rolling Year Six Through Ten, Amortized Cost before Other than Temporary Impairment

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Held-to-maturity Securities, Debt Maturities, Rolling Year Six Through Ten, Average Yield

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Held-to-maturity Securities, Debt Maturities, Rolling Year Two Through Five, Amortized Cost before Other than Temporary Impairment

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Held-to-maturity Securities, Debt Maturities, Rolling Year Two Through Five, Average Yield

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319

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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
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Amount before other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value of held-to-maturity debt securities maturing in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of held-to-maturity debt securities maturing after the tenth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of held-to-maturity debt securities maturing in the sixth through tenth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of held-to-maturity debt securities maturing in the second through fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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