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Securities Available for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | $ 392,576 | $ 374,343
Gross Unrealized Gains | 4,253 | 2,263
Gross Unrealized Losses | (3,498) | (6,611)
Fair Value | 393,331 | 369,995
Corporate bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 1,238 | 1,343
Gross Unrealized Gains | 4 | 4
Gross Unrealized Losses | (8) | (8)
Fair Value | 1,234 | 1,339
Collateralized mortgage obligations |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 17,898 | 21,397
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (777) | (705)
Fair Value | 17,121 | 20,693
Small Business Administration |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 14,608 | 17,236
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (396) | (530)
Fair Value | 14,212 | 16,706
U.S. Treasury and U.S. government sponsored entities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 8,986 | 5,970
Gross Unrealized Gains | 0 | 5
Gross Unrealized Losses | (69) | (54)
Fair Value | 8,917 | 5,921
State and political subdivisions |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 188,032 | 157,014
Gross Unrealized Gains | 3,614 | 1,049
Gross Unrealized Losses | (643) | (2,760)
Fair Value | 191,003 | 155,303
Mortgage-backed securities - residential |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 161,635 | 171,215
Gross Unrealized Gains | 419 | 1,019
Gross Unrealized Losses | (1,604) | (2,552)
Fair Value | 160,450 | 169,682
Equity securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 179 | 168
Gross Unrealized Gains | 216 | 185
Gross Unrealized Losses | (1) | (2)
Fair Value | $ 394 | $ 351

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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