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Securities - Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | $ 1,141,627 | $ 686,405
Gross Unrealized Gains | 17,781 | 3,908
Gross Unrealized Losses | (8,949) | (16,065)
Securities available for sale, at fair value | 1,150,459 | 674,248
Trust preferred securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 12,454 | 23,749
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (3,494) | (5,360)
Securities available for sale, at fair value | 8,960 | 18,389
Other debt securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 26,546 | 22,053
Gross Unrealized Gains | 429 | 310
Gross Unrealized Losses | (56) | (218)
Securities available for sale, at fair value | 26,919 | 22,145
Obligations of other U.S. Government agencies and corporations |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 14,648 | 2,066
Gross Unrealized Gains | 74 | 92
Gross Unrealized Losses | (84) | 0
Securities available for sale, at fair value | 14,638 | 2,158
Obligations of states and political subdivisions |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 337,725 |
Gross Unrealized Gains | 12,787 |
Gross Unrealized Losses | (158) |
Securities available for sale, at fair value | 350,354 |
Government agency mortgage backed securities | Residential mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 459,336 | 414,019
Gross Unrealized Gains | 2,876 | 1,941
Gross Unrealized Losses | (2,654) | (6,643)
Securities available for sale, at fair value | 459,558 | 409,317
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 45,340 | 50,628
Gross Unrealized Gains | 762 | 696
Gross Unrealized Losses | (173) | (461)
Securities available for sale, at fair value | 45,929 | 50,863
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 234,224 | 171,362
Gross Unrealized Gains | 764 | 831
Gross Unrealized Losses | (2,330) | (3,367)
Securities available for sale, at fair value | 232,658 | 168,826
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 11,354 | 2,528
Gross Unrealized Gains | 89 | 38
Gross Unrealized Losses | 0 | (16)
Securities available for sale, at fair value | $ 11,443 | $ 2,550

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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=75030427&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=82897076&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=82896770&loc=d3e26610-111562 + Details
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