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Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
--- | --- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |  |
Amortized Cost | $ 403,001 | $ 407,276 | $ 403,001
Gross Unrealized Gains | 4,491 | 2,231 |
Gross Unrealized Losses | (3,722) | (7,317) |
Fair Value | 403,770 | 402,190 |
Corporate bonds |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Amortized Cost | 1,206 | 1,206 |
Gross Unrealized Gains | 4 | 0 |
Gross Unrealized Losses | (7) | (18) |
Fair Value | 1,203 | 1,188 |
Small Business Administration |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Amortized Cost | 11,936 | 12,292 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | (245) | (362) |
Fair Value | 11,691 | 11,930 |
U.S. Treasury and U.S. government sponsored entities |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Amortized Cost | 5,911 | 6,111 |
Gross Unrealized Gains | 4 | 0 |
Gross Unrealized Losses | (68) | (102) |
Fair Value | 5,847 | 6,009 |
State and political subdivisions |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Amortized Cost | 211,197 | 211,762 |
Gross Unrealized Gains | 4,080 | 2,075 |
Gross Unrealized Losses | (541) | (1,893) |
Fair Value | 214,736 | 211,944 |
Mortgage-backed securities - residential |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Amortized Cost | 151,555 | 154,130 |
Gross Unrealized Gains | 241 | 84 |
Gross Unrealized Losses | (2,188) | (4,167) |
Fair Value | 149,608 | 150,047 |
Collateralized mortgage obligations - residential |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Amortized Cost | 21,196 | 21,775 |
Gross Unrealized Gains | 162 | 72 |
Gross Unrealized Losses | (673) | (775) |
Fair Value | $ 20,685 | $ 21,072 |

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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