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Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Investment Securities |  |
Total investment securities available-for-sale, Amortized Cost | $ 796,917 | $ 781,232
Gross Unrealized Gains | 17,683 | 13,955
Gross Unrealized Losses | (342) | (3,460)
Investment securities, available-for-sale | 814,258 | 791,727
Contractual maturities of investments in debt securities available-for-sale, Amortized Cost |  |
Due in one year or less | 214,503 |
Due after one year through five years | 318,873 |
Due after five years through ten years | 22,113 |
Due after ten years | 0 |
Mortgage-backed securities | 239,829 |
Total debt securities available-for-sale | 795,318 |
Contractual maturities of investments in debt securities available-for-sale, Fair Value |  |
Due in one year or less | 215,323 |
Due after one year through five years | 324,549 |
Due after five years through ten years | 22,717 |
Due after ten years | 0 |
Mortgage-backed securities | 244,539 |
Total debt securities available-for-sale | 807,128 |
U.S. Treasury and Federal agencies securities |  |
Investment Securities |  |
Total investment securities available-for-sale, Amortized Cost | 396,740 | 389,457
Gross Unrealized Gains | 3,396 | 1,718
Gross Unrealized Losses | (5) | (1,506)
Investment securities, available-for-sale | 400,131 | 389,669
U.S. States and political subdivisions securities |  |
Investment Securities |  |
Total investment securities available-for-sale, Amortized Cost | 125,917 | 120,441
Gross Unrealized Gains | 3,364 | 2,692
Gross Unrealized Losses | (63) | (143)
Investment securities, available-for-sale | 129,218 | 122,990
Mortgage-backed securities - Federal agencies |  |
Investment Securities |  |
Total investment securities available-for-sale, Amortized Cost | 239,829 | 234,400
Gross Unrealized Gains | 4,982 | 3,430
Gross Unrealized Losses | (272) | (1,533)
Investment securities, available-for-sale | 244,539 | 236,297
Corporate debt securities |  |
Investment Securities |  |
Total investment securities available-for-sale, Amortized Cost | 32,032 | 34,241
Gross Unrealized Gains | 398 | 199
Gross Unrealized Losses | 0 | (57)
Investment securities, available-for-sale | 32,430 | 34,383
Foreign government and other securities |  |
Investment Securities |  |
Total investment securities available-for-sale, Amortized Cost | 800 | 800
Gross Unrealized Gains | 10 | 10
Gross Unrealized Losses | 0 | (1)
Investment securities, available-for-sale | 810 | 809
Total debt securities |  |
Investment Securities |  |
Total investment securities available-for-sale, Amortized Cost | 795,318 | 779,339
Gross Unrealized Gains | 12,150 | 8,049
Gross Unrealized Losses | (340) | (3,240)
Investment securities, available-for-sale | 807,128 | 784,148
Marketable equity securities |  |
Investment Securities |  |
Total investment securities available-for-sale, Amortized Cost | 1,599 | 1,893
Gross Unrealized Gains | 5,533 | 5,906
Gross Unrealized Losses | (2) | (220)
Investment securities, available-for-sale | $ 7,130 | $ 7,579

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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=73527792&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=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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