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Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost Basis | $ 251,040 | $ 245,308
Gross Unrealized Gains | 2,961 | 1,235
Gross Unrealized Losses | (2,670) | (4,775)
Estimated Fair Value | 251,331 | 241,768
Municipal securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost Basis | 84,407 | 93,516
Gross Unrealized Gains | 2,478 | 1,072
Gross Unrealized Losses | (40) | (524)
Estimated Fair Value | 86,845 | 94,064
U.S. government sponsored entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost Basis | 14,989 | 7,997
Gross Unrealized Gains | 40 | 28
Gross Unrealized Losses | (76) | (131)
Estimated Fair Value | 14,953 | 7,894
Collateralized mortgage obligations and residential mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost Basis | 143,327 | 137,834
Gross Unrealized Gains | 443 | 135
Gross Unrealized Losses | (1,164) | (2,688)
Estimated Fair Value | 142,606 | 135,281
Collateralized Debt Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost Basis | 3,469 | 3,481
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,390) | (1,432)
Estimated Fair Value | 2,079 | 2,049
Money Market Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost Basis | 4,254 | 2,480
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 4,254 | $ 2,480
US Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost Basis | 594 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | $ 594 |

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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