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Investment Securities Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 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 | $ 43 | $ 253 | $ 2,599
Due in 1 to 5 years, Securities available for sale, Amortized Cost | 1,909 | 2,251 | 3,321
Due in 5 to 10 years, Securities available for sale, Amortized Cost | 31,835 | 21,043 | 19,222
Due after 10 years, Securities available for sale, Amortized Cost | 277,044 | 275,033 | 183,858
Equity securities, Amortized Cost | 3,229 | 3,274 | 3,148
Amortized Cost | 314,060 | 301,854 | 212,148
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) | 43 | 253 | 2,633
Due in 1 to 5 years, Securities available for sale, Fair Value (Estimated) | 1,953 | 2,298 | 3,390
Due in 5 to 10 years, Securities available for sale, Fair Value (Estimated) | 32,471 | 21,505 | 19,946
Due after 10 years, Securities available for sale, Fair Value (Estimated) | 274,865 | 273,030 | 187,592
Equity securities, Fair Value (Estimated) | 3,292 | 3,330 | 3,164
Fair Value (Estimated) | 312,624 | 300,416 | 216,725
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 | 903 | 906 | 1,825
Due in 1 to 5 years, Securities to be held to maturity, Amortized Cost | 12,213 | 13,451 | 6,709
Due in 5 to 10 years, Securities to be held to maturity, Amortized Cost | 42,819 | 41,588 | 56,874
Due after 10 years, Securities to be held to maturity, Amortized Cost | 184,894 | 170,883 | 171,203
Securities to be held to maturity, Amortized Cost | 240,829 | 226,828 | 236,611
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) | 908 | 913 | 1,847
Due in 1 to 5 years, Securities to be held to maturity, Fair Value (Estimated) | 12,477 | 13,714 | 6,925
Due in 5 to 10 years, Securities to be held to maturity, Fair Value (Estimated) | 43,562 | 42,448 | 58,932
Due after 10 years, Securities to be held to maturity, Fair Value (Estimated) | 182,431 | 168,462 | 175,633
Fair Value (Estimated) | $ 239,378 | $ 225,537 | $ 243,337

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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 Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + 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=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