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Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Securities [Abstract] |  |
Debt Securities Available for Sale, Due in one year or less, Amortized Cost | $ 4,814 |
Debt Securities Available for Sale, Due after one year through five years, Amortized Cost | 54,339 |
Debt Securities Available for Sale, Due after five years through ten years, Amortized Cost | 1,259,696 |
Debt Securities Available for Sale, Due after ten years, Amortized Cost | 1,730,002 |
Total available for sale debt securities, Amortized Cost | 3,048,851 |
Debt Securities Available for Sale, Due in one year or less, Fair Value | 4,820 |
Debt Securities Available for Sale, Due after one year through five years, Fair Value | 54,077 |
Debt Securities Available for Sale, Due after five years through ten years, Fair Value | 1,196,235 |
Debt Securities Available for Sale, Due after ten years, Fair Value | 1,663,053 |
Total available for sale debt securities, Fair Value | 2,918,185 |
Debt Securities Held to Maturity, Due in one year or less, Amortized Cost | 24,832 |
Debt Securities Held to Maturity, Due after one year through five years, Amortized Cost | 130,348 |
Debt Securities Held to Maturity, Due after five years through ten years, Amortized Cost | 1,452,690 |
Debt Securities Held to Maturity, Due after ten years, Amortized Cost | 1,461,392 |
Total held to maturity debt securities, Amortized Cost | 3,069,262 | $ 2,977,511
Debt Securities Held to Maturity, Due in one year or less, Fair Value | 24,909 |
Debt Securities Held to Maturity, Due after one year through five years, Fair Value | 127,950 |
Debt Securities Held to Maturity, Due after five years through ten years, Fair Value | 1,407,279 |
Debt Securities Held to Maturity, Due after ten years, Fair Value | 1,415,317 |
Total held to maturity debt securities, Fair Value | $ 2,975,455 | $ 2,962,010

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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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