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Investment Securities - Amortized Cost and Fair Values of Debt Securities Held to Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 372,513 | $ 384,324
Gross Unrealized Gains | 60 | 331
Gross Unrealized Losses | (3,955) | (2,314)
Estimated Fair Value | 368,618 | 382,341
Obligations of U.S. Government-Sponsored Enterprises [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 38,667 | 31,910
Gross Unrealized Gains | 55 | 301
Gross Unrealized Losses | (721) | (58)
Estimated Fair Value | 38,001 | 32,153
Mortgage - Backed Securities - Residential [Member] | US Government Agencies Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 4,297 | 4,775
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (4) | (7)
Estimated Fair Value | 4,293 | 4,768
Mortgage - Backed Securities - Residential [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 280,430 | 315,609
Gross Unrealized Gains | 5 | 30
Gross Unrealized Losses | (2,527) | (1,824)
Estimated Fair Value | 277,908 | 313,815
Mortgage - Backed Securities - Commercial [Member] | US Government Agencies Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 34,444 | 16,843
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (561) | (247)
Estimated Fair Value | 33,883 | 16,596
Mortgage - Backed Securities - Commercial [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 14,675 | 15,187
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (142) | (178)
Estimated Fair Value | $ 14,533 | $ 15,009

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- Definition Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity. + 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 (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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