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Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost Basis | $ 255,168 | $ 245,308
Gross Unrealized Gains | 5,283 | 1,235
Gross Unrealized Losses | (1,709) | (4,775)
Estimated Fair Value | 258,742 | 241,768
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost Basis | 88,451 | 93,516
Gross Unrealized Gains | 3,819 | 1,072
Gross Unrealized Losses | (28) | (524)
Estimated Fair Value | 92,242 | 94,064
Money Market Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost Basis | 5,598 | 2,480
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 5,598 | 2,480
US Government-sponsored Enterprises Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost Basis | 12,986 | 7,997
Gross Unrealized Gains | 96 | 28
Gross Unrealized Losses | 0 | (131)
Estimated Fair Value | 13,082 | 7,894
Collateralized mortgage obligations and residential mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost Basis | 144,079 | 137,834
Gross Unrealized Gains | 1,368 | 135
Gross Unrealized Losses | (273) | (2,688)
Estimated Fair Value | 145,174 | 135,281
Collateralized Debt Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost Basis | 3,455 | 3,481
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,408) | (1,432)
Estimated Fair Value | 2,047 | 2,049
US Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost Basis | 599 | 0
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 599 | $ 0

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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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