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Investment Securities Held to Maturity Securities by Type (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities | $ 405,976 | $ 384,324
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 8,794 | 331
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | (2,314)
Securities held to maturity, fair value | 414,770 | 382,341
US Government Agencies Residential Mortgage-backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities | 4,712 | 4,775
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 146 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | (7)
Securities held to maturity, fair value | 4,858 | 4,768
US Government Agency Debt Securities Commercial [Domain] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities | 36,529 | 16,843
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 403 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | (247)
Securities held to maturity, fair value | 36,932 | 16,596
Residential Mortgage Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities | 313,987 | 315,609
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 6,746 | 30
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | (1,824)
Securities held to maturity, fair value | 320,733 | 313,815
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities | 14,940 | 15,187
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 460 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | (178)
Securities held to maturity, fair value | 15,400 | 15,009
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities | 35,808 | 31,910
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 1,039 | 301
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | (58)
Securities held to maturity, fair value | $ 36,847 | $ 32,153

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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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