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Securities - Amortized Cost and Fair Value, Available for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | $ 674,104 | $ 686,405
Gross Unrealized Gains | 7,872 | 3,908
Gross Unrealized Losses | (10,488) | (16,065)
Fair Value | 671,488 | 674,248
Trust preferred securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 12,442 | 23,749
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (3,054) | (5,360)
Fair Value | 9,388 | 18,389
Other debt securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 17,106 | 22,053
Gross Unrealized Gains | 260 | 310
Gross Unrealized Losses | (76) | (218)
Fair Value | 17,290 | 22,145
Other equity securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost |  | 0
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Fair Value |  | 0
Obligations of other U.S. Government agencies and corporations |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 3,554 | 2,066
Gross Unrealized Gains | 40 | 92
Gross Unrealized Losses | (30) | 0
Fair Value | 3,564 | 2,158
Obligations of states and political subdivisions |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 228,589 |
Gross Unrealized Gains | 6,161 |
Gross Unrealized Losses | (269) |
Fair Value | 234,481 |
Government agency mortgage backed securities | Residential mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 196,121 | 414,019
Gross Unrealized Gains | 888 | 1,941
Gross Unrealized Losses | (3,059) | (6,643)
Fair Value | 193,950 | 409,317
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 31,015 | 50,628
Gross Unrealized Gains | 389 | 696
Gross Unrealized Losses | (234) | (461)
Fair Value | 31,170 | 50,863
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 180,258 | 171,362
Gross Unrealized Gains | 133 | 831
Gross Unrealized Losses | (3,752) | (3,367)
Fair Value | 176,639 | 168,826
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 5,019 | 2,528
Gross Unrealized Gains | 1 | 38
Gross Unrealized Losses | (14) | (16)
Fair Value | $ 5,006 | $ 2,550

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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=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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