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Investment Securities Held to Maturity Securities by Type (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities | $ 154,035 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 851 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (49) |
Securities held to maturity, fair value | 154,837 | $ 0
US Government Agencies Residential Mortgage-backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities | 4,806 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 24 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 |
Securities held to maturity, fair value | 4,830 |
Residential Mortgage Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities | 116,065 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 520 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (6) |
Securities held to maturity, fair value | 116,579 |
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities | 15,299 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 176 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 |
Securities held to maturity, fair value | 15,475 |
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities | 17,865 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 131 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (43) |
Securities held to maturity, fair value | $ 17,953 |

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- Definition Amount after other than temporary impairment (OTTI) accretion, 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 (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 3: 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=27724398&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of accumulated unrealized gain on 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 (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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