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Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Securities [Abstract] |  |
Debt Securities Available for Sale, Due in one year or less, Amortized Cost | $ 5,392 |
Debt Securities Available for Sale, Due after one year through five years, Amortized Cost | 46,852 |
Debt Securities Available for Sale, Due after five years through ten years, Amortized Cost | 1,097,850 |
Debt Securities Available for Sale, Due after ten years, Amortized Cost | 1,729,249 |
Total available for sale debt securities, Amortized Cost | 2,879,343 |
Debt Securities Available for Sale, Due in one year or less, Fair Value | 5,425 |
Debt Securities Available for Sale, Due after one year through five years, Fair Value | 47,394 |
Debt Securities Available for Sale, Due after five years through ten years, Fair Value | 1,082,709 |
Debt Securities Available for Sale, Due after ten years, Fair Value | 1,719,750 |
Total available for sale debt securities, Fair Value | 2,855,278 |
Debt Securities Held to Maturity, Due in one year or less, Amortized Cost | 10,081 |
Debt Securities Held to Maturity, Due after one year through five years, Amortized Cost | 108,164 |
Debt Securities Held to Maturity, Due after five years through ten years, Amortized Cost | 837,353 |
Debt Securities Held to Maturity, Due after ten years, Amortized Cost | 1,813,676 |
Total held to maturity debt securities, Amortized Cost | 2,769,274 | $ 2,500,220
Debt Securities Held to Maturity, Due in one year or less, Fair Value | 10,123 |
Debt Securities Held to Maturity, Due after one year through five years, Fair Value | 108,726 |
Debt Securities Held to Maturity, Due after five years through ten years, Fair Value | 833,465 |
Debt Securities Held to Maturity, Due after ten years, Fair Value | 1,815,834 |
Total held to maturity debt securities, Fair Value | $ 2,768,148 | $ 2,470,117

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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 after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563 + Details
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