Investment Securities Held-to-maturity Securities by Maturities (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Investments [Abstract]
Federal income tax rate	35.00%	34.10%	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	318
Amortized cost of securities maturing in 5-10 years	5,601
Amortized cost of securities maturing in over 10 years	37,225
Amortized Cost	43,144	$ 45,728
Fair value of securities maturing within 1 year	0
Fair value of securities maturing in 1-5 years	320
Fair value of securities maturing in 5-10 years	5,701
Fair value of securities maturing in over 10 years	37,206
Fair Value	$ 43,227	45,853
Average yield of securities maturing within 1 year	0.00%
Average yield of securities maturing in 1-5 years	6.16%
Average yield of securities maturing in 5-10 years	3.03%
Average yield of securities maturing in over 10 years	3.66%
Total average yield	3.60%
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	318
Amortized cost of securities maturing in 5-10 years	978
Amortized cost of securities maturing in over 10 years	2,524
Amortized Cost	3,820	3,831
Fair value of securities maturing within 1 year	0
Fair value of securities maturing in 1-5 years	320
Fair value of securities maturing in 5-10 years	1,058
Fair value of securities maturing in over 10 years	2,663
Fair Value	4,041	4,221
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	4,623
Amortized cost of securities maturing in over 10 years	29,235
Amortized Cost	33,858	35,367
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	4,643
Fair value of securities maturing in over 10 years	29,119
Fair Value	33,762	35,196
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	5,466
Amortized Cost	5,466	6,530
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	5,424
Fair Value	$ 5,424	$ 6,436

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
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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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