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Investment Securities - Amortized Cost and Fair Values of Debt Securities Held to Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 393,855 | $ 422,096
Gross Unrealized Gains | 387 | 345
Gross Unrealized Losses | (10,249) | (4,192)
Estimated Fair Value | 383,993 | 418,249
Obligations of U.S. Government-Sponsored Enterprises [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 42,331 | 40,540
Gross Unrealized Gains | 175 | 335
Gross Unrealized Losses | (313) | (161)
Estimated Fair Value | 42,193 | 40,714
ERROR in label resolution. |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 400 | 200
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 400 | 200
Mortgage - Backed Securities - Commercial [Member] | Obligations of U.S. Government [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 55,221 | 58,249
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2,327) | (1,394)
Estimated Fair Value | 52,894 | 56,855
Mortgage - Backed Securities - Commercial [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 13,159 | 14,056
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (258) | (71)
Estimated Fair Value | 12,901 | 13,985
Mortgage - Backed Securities - Residential [Member] | Obligations of U.S. Government [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 3,635 | 3,925
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (97) | (14)
Estimated Fair Value | 3,538 | 3,911
Mortgage - Backed Securities - Residential [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 279,109 | 305,126
Gross Unrealized Gains | 212 | 10
Gross Unrealized Losses | (7,254) | (2,552)
Estimated Fair Value | $ 272,067 | $ 302,584

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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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