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Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost Basis | $ 243,619 | $ 235,903
Gross Unrealized Gains | 3,879 | 2,587
Gross Unrealized Losses | (3,008) | (4,865)
Estimated Fair Value | 244,490 | 233,625
Municipal securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost Basis | 100,088 | 95,242
Gross Unrealized Gains | 3,709 | 2,146
Gross Unrealized Losses | (50) | (643)
Estimated Fair Value | 103,747 | 96,745
U.S. government sponsored entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost Basis | 3,996 | 16,643
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (106) | (369)
Estimated Fair Value | 3,890 | 16,274
Collateralized mortgage obligations and residential mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost Basis | 134,224 | 118,807
Gross Unrealized Gains | 170 | 441
Gross Unrealized Losses | (1,456) | (1,273)
Estimated Fair Value | 132,938 | 117,975
Collateralized Debt Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost Basis | 4,835 | 4,989
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,396) | (2,580)
Estimated Fair Value | 3,439 | 2,409
Money market fund [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost Basis | 476 | 222
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 476 | $ 222

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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