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Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Investment Securities |  |
Gross Unrealized Losses | $ (15,737) | $ (7,511)
Investment securities, available-for-sale | 942,076 | 904,033
Contractual maturities of investments in debt securities available-for-sale, Amortized Cost |  |
Due in one year or less | 73,984 |
Due after one year through five years | 560,259 |
Due after five years through ten years | 20,520 |
Due after ten years | 0 |
Mortgage-backed securities | 301,717 |
Total debt securities available-for-sale | 956,480 |
Contractual maturities of investments in debt securities available-for-sale, Fair Value |  |
Due in one year or less | 73,935 |
Due after one year through five years | 551,743 |
Due after five years through ten years | 20,068 |
Due after ten years | 0 |
Mortgage-backed securities | 296,330 |
Total debt securities available-for-sale | 942,076 |
U.S. Treasury and Federal agencies securities |  |
Investment Securities |  |
Total investment securities available-for-sale, Amortized Cost | 510,739 | 471,508
Gross Unrealized Gains | 7 | 57
Gross Unrealized Losses | (7,749) | (3,446)
Investment securities, available-for-sale | 502,997 | 468,119
U.S. States and political subdivisions securities |  |
Investment Securities |  |
Total investment securities available-for-sale, Amortized Cost | 98,740 | 116,260
Gross Unrealized Gains | 321 | 648
Gross Unrealized Losses | (1,076) | (908)
Investment securities, available-for-sale | 97,985 | 116,000
Mortgage-backed securities - Federal agencies |  |
Investment Securities |  |
Total investment securities available-for-sale, Amortized Cost | 301,717 | 289,327
Gross Unrealized Gains | 997 | 1,456
Gross Unrealized Losses | (6,384) | (2,873)
Investment securities, available-for-sale | 296,330 | 287,910
Corporate debt securities |  |
Investment Securities |  |
Total investment securities available-for-sale, Amortized Cost | 44,584 | 31,573
Gross Unrealized Gains | 0 | 5
Gross Unrealized Losses | (528) | (284)
Investment securities, available-for-sale | 44,056 | 31,294
Foreign government and other securities |  |
Investment Securities |  |
Total investment securities available-for-sale, Amortized Cost | 700 | 700
Gross Unrealized Gains | 8 | 10
Gross Unrealized Losses | 0 | 0
Investment securities, available-for-sale | $ 708 | $ 710

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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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