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Investment Securities - Schedule of Debt Securities Expected Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Amortized Cost |  |  |
Due within 1 year |  | $ 0 |
Due after 1 but within 5 years |  | 2,636 |
Due after 5 but within 10 years |  | 31,893 |
Due after 10 years |  | 4,138 |
Amortized Cost |  | 38,667 |
Held-to-maturity Securities |  | 372,513 | $ 384,324
Estimated Fair Value |  |  |
Due within 1 year |  | 0 |
Due after 1 but within 5 years |  | 2,615 |
Due after 5 but within 10 years |  | 31,384 |
Due after 10 years |  | 4,002 |
Estimated Fair Value |  | 38,001 |
Securities held to maturity, fair value |  | 368,618 | $ 382,341
Mortgage-Backed Securities [Member] |  |  |
Amortized Cost |  |  |
Held-to-maturity Securities | [1] | 333,846 |
Estimated Fair Value |  |  |
Securities held to maturity, fair value | [1] | 330,617 |
Mortgage-Backed Securities [Member] | US Government Agencies Debt Securities [Member] |  |  |
Amortized Cost |  |  |
Held-to-maturity Securities |  | 38,700 |
Estimated Fair Value |  |  |
Securities held to maturity, fair value |  | 38,200 |
Mortgage-Backed Securities [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |  |
Amortized Cost |  |  |
Held-to-maturity Securities |  | 295,100 |
Estimated Fair Value |  |  |
Securities held to maturity, fair value |  | $ 292,400 |
[1] | Mortgage Backed Securities include an amortized cost of $38.7 million and a fair value of $38.2 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $295.1 million and a fair value of $292.4 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.

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- Definition Fair value of held-to-maturity debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. 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 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f)(3) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 + Details
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