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Investment Securities - Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
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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 | $ 176 | $ 253 | $ 973
Due in 1 to 5 years, Securities available for sale, Amortized Cost | 856 | 2,251 | 3,020
Due in 5 to 10 years, Securities available for sale, Amortized Cost | 33,550 | 21,043 | 22,843
Due after 10 years, Securities available for sale, Amortized Cost | 262,429 | 275,033 | 248,032
Equity securities, Amortized Cost | 3,257 | 3,274 | 3,258
Amortized Cost | 300,268 | 301,854 | 278,126
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) | 179 | 253 | 974
Due in 1 to 5 years, Securities available for sale, Fair Value (Estimated) | 859 | 2,298 | 3,106
Due in 5 to 10 years, Securities available for sale, Fair Value (Estimated) | 33,987 | 21,505 | 23,503
Due after 10 years, Securities available for sale, Fair Value (Estimated) | 260,606 | 273,030 | 251,415
Equity securities, Fair Value (Estimated) | 3,368 | 3,330 | 3,295
Securities available for sale, Fair Value (Estimated) | 298,999 | 300,416 | 282,293
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |  |
Due in 1 year or less, Securities to be held to maturity, Amortized Cost | 552 | 906 | 1,772
Due in 1 to 5 years, Securities to be held to maturity, Amortized Cost | 17,241 | 13,451 | 13,428
Due in 5 to 10 years, Securities to be held to maturity, Amortized Cost | 37,218 | 41,588 | 39,832
Due after 10 years, Securities to be held to maturity, Amortized Cost | 187,668 | 170,883 | 133,738
Securities to be held to maturity, Amortized Cost | 242,679 | 226,828 | 188,770
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
Due in 1 year or less, Securities to be held to maturity, Fair Value (Estimated) | 559 | 913 | 1,783
Due in 1 to 5 years, Securities to be held to maturity, Fair Value (Estimated) | 17,485 | 13,714 | 13,782
Due in 5 to 10 years, Securities to be held to maturity, Fair Value (Estimated) | 37,963 | 42,448 | 41,423
Due after 10 years, Securities to be held to maturity, Fair Value (Estimated) | 189,014 | 168,462 | 138,809
Securities to be held to maturity, Fair Value (Estimated) | $ 245,021 | $ 225,537 | $ 195,797

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- Definition This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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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=82897076&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=82897076&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=82897076&loc=d3e27232-111563 + Details
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