Investment Securities Held-to-maturity Securities by Maturities (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investments [Abstract]
Federal income tax rate	35.00%	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	0
Amortized cost of securities maturing in 5-10 years	836
Amortized cost of securities maturing in over 10 years	47,632
Total amortized cost	48,468	49,222
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	831
Fair value of securities maturing in over 10 years	47,611
Fair Value	48,442	46,094
Average yield of securities maturing within 1 year	0.00%
Average yield of securities maturing in 1-5 years	0.00%
Average yield of securities maturing in 5-10 years	2.61%
Average yield of securities maturing in over 10 years	2.77%
Total average yield	2.76%
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	0
Amortized cost of securities maturing in 5-10 years	329
Amortized cost of securities maturing in over 10 years	3,512
Total amortized cost	3,841	3,850
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	323
Fair value of securities maturing in over 10 years	3,959
Fair Value	4,282	3,929
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	507
Amortized cost of securities maturing in over 10 years	36,438
Total amortized cost	36,945	37,536
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	508
Fair value of securities maturing in over 10 years	36,232
Fair Value	36,740	34,530
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	7,682
Total amortized cost	7,682	7,836
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	7,420
Fair Value	$ 7,420	$ 7,635

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

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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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