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Investment Securities Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015
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Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |  |  |
Due in 1 year or less, Securities available for sale, Amortized Cost | $ 2,058 | $ 527 | $ 2,396
Due in 1 to 5 years, Securities available for sale, Amortized Cost | 3,326 | 7,562 | 22,945
Due in 5 to 10 years, Securities available for sale, Amortized Cost | 24,917 | 19,647 | 8,993
Due after 10 years, Securities available for sale, Amortized Cost | 201,839 | 190,194 | 174,831
Equity securities, Amortized Cost | 3,034 | 3,381 | 3,129
Amortized Cost | 235,174 | 221,311 | 212,294
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
Due in 1 year or less, Securities available for sale, Fair Value (Estimated) | 2,072 | 530 | 2,389
Due in 1 to 5 years, Securities available for sale, Fair Value (Estimated) | 3,432 | 7,727 | 22,860
Due in 5 to 10 years, Securities available for sale, Fair Value (Estimated) | 25,839 | 20,055 | 9,355
Due after 10 years, Securities available for sale, Fair Value (Estimated) | 206,947 | 191,304 | 176,028
Equity securities, Fair Value (Estimated) | 3,037 | 3,423 | 3,182
Fair Value (Estimated) | 241,327 | 223,039 | 213,814
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |  |
Due in 1 year or less, Securities available to be held to maturity, Amortized Cost | 1,847 | 1,814 | 1,044
Due in 1 to 5 years, Securities to be held to maturity, Amortized Cost | 13,162 | 6,306 | 12,532
Due in 5 to 10 years, Securities to be held to maturity, Amortized Cost | 42,679 | 58,397 | 45,958
Due after 10 years, Securities to be held to maturity, Amortized Cost | 158,584 | 173,506 | 189,716
Securities to be held to maturity, Amortized Cost | 216,272 | 240,023 | 249,250
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
Due in 1 year or less, Securities available to be held to maturity, Fair Value (Estimated) | 1,857 | 1,850 | 1,056
Due in 1 to 5 years, Securities to be held to maturity, Fair Value (Estimated) | 13,538 | 6,514 | 12,740
Due in 5 to 10 years, Securities to be held to maturity, Fair Value (Estimated) | 44,693 | 60,196 | 47,525
Due after 10 years, Securities to be held to maturity, Fair Value (Estimated) | 165,112 | 174,563 | 187,377
Fair Value (Estimated) | $ 225,200 | $ 243,123 | $ 248,698

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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant