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Investment Securities - Amortized Cost and Fair Values of Debt Securities Held to Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 337,123 | $ 393,855
Gross Unrealized Gains | 2,073 | 387
Gross Unrealized Losses | (478) | (10,249)
Estimated Fair Value | 338,718 | 383,993
Obligations of U.S. Government-Sponsored Enterprises [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 40,092 | 42,331
Gross Unrealized Gains | 554 | 175
Gross Unrealized Losses | 0 | (313)
Estimated Fair Value | 40,646 | 42,193
ERROR in label resolution. |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 600 | 400
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 600 | 400
Mortgage - Backed Securities - Commercial [Member] | Obligations of U.S. Government [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 51,291 | 55,221
Gross Unrealized Gains | 18 | 0
Gross Unrealized Losses | (184) | (2,327)
Estimated Fair Value | 51,125 | 52,894
Mortgage - Backed Securities - Commercial [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 12,081 | 13,159
Gross Unrealized Gains | 67 | 0
Gross Unrealized Losses | 0 | (258)
Estimated Fair Value | 12,148 | 12,901
Mortgage - Backed Securities - Residential [Member] | Obligations of U.S. Government [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 3,392 | 3,635
Gross Unrealized Gains | 57 | 0
Gross Unrealized Losses | 0 | (97)
Estimated Fair Value | 3,449 | 3,538
Mortgage - Backed Securities - Residential [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 229,667 | 279,109
Gross Unrealized Gains | 1,377 | 212
Gross Unrealized Losses | (294) | (7,254)
Estimated Fair Value | $ 230,750 | $ 272,067

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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=118954083&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=118939692&loc=d3e27232-111563 + Details
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