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Investment Securities - Amortized Cost and Fair Values of Debt Securities Held to Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 422,096 | $ 372,513
Gross Unrealized Gains | 345 | 60
Gross Unrealized Losses | (4,192) | (3,955)
Estimated Fair Value | 418,249 | 368,618
Obligations of U.S. Government-Sponsored Enterprises [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 40,540 | 38,667
Gross Unrealized Gains | 335 | 55
Gross Unrealized Losses | (161) | (721)
Estimated Fair Value | 40,714 | 38,001
Foreign Government Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 200 | 0
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 200 | 0
Mortgage - Backed Securities - Residential [Member] | US Government Agencies Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 3,925 | 4,297
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (14) | (4)
Estimated Fair Value | 3,911 | 4,293
Mortgage - Backed Securities - Residential [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 305,126 | 280,430
Gross Unrealized Gains | 10 | 5
Gross Unrealized Losses | (2,552) | (2,527)
Estimated Fair Value | 302,584 | 277,908
Mortgage - Backed Securities - Commercial [Member] | US Government Agencies Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 58,249 | 34,444
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,394) | (561)
Estimated Fair Value | 56,855 | 33,883
Mortgage - Backed Securities - Commercial [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 14,056 | 14,675
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (71) | (142)
Estimated Fair Value | $ 13,985 | $ 14,533

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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=82897076&loc=d3e27232-111563 + Details
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