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Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | $ 392,744 | $ 392,397
Gross Unrealized Gains | 1,765 | 4,037
Gross Unrealized Losses | (10,113) | (3,497)
Fair Value | 384,396 | 392,937
Corporate bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 1,184 | 1,238
Gross Unrealized Gains | 0 | 4
Gross Unrealized Losses | (23) | (8)
Fair Value | 1,161 | 1,234
Small Business Administration |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 14,249 | 14,608
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (506) | (396)
Fair Value | 13,743 | 14,212
U.S. Treasury and U.S. government sponsored entities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 6,166 | 8,986
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (137) | (69)
Fair Value | 6,029 | 8,917
State and political subdivisions |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 191,491 | 188,032
Gross Unrealized Gains | 1,728 | 3,614
Gross Unrealized Losses | (3,185) | (643)
Fair Value | 190,034 | 191,003
Mortgage-backed securities - residential |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 162,503 | 161,635
Gross Unrealized Gains | 37 | 419
Gross Unrealized Losses | (5,244) | (1,604)
Fair Value | 157,296 | 160,450
Collateralized mortgage obligations - residential |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 17,151 | 17,898
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,018) | (777)
Fair Value | $ 16,133 | $ 17,121

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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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