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Securities Continuous Unrealized Loss (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 31,889 | $ 69,830
Available-for-sale Securities Continuous Unrealized Loss Position Less Than 12 Months Accumulated Loss | 447 | 484
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 157,875 | 81,237
Available-for-sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Accumulated Loss | 5,183 | 2,296
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 189,764 | 151,067
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Losses | 5,630 | 2,780
US Government and Government Agencies and Authorities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 4,724 | 14,381
Available-for-sale Securities Continuous Unrealized Loss Position Less Than 12 Months Accumulated Loss | 28 | 99
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 44,307 | 20,353
Available-for-sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Accumulated Loss | 1,172 | 805
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 49,031 | 34,734
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Losses | 1,200 | 904
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 12,325 | 53,440
Available-for-sale Securities Continuous Unrealized Loss Position Less Than 12 Months Accumulated Loss | 238 | 363
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 99,184 | 50,729
Available-for-sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Accumulated Loss | 3,500 | 1,276
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 111,509 | 104,169
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Losses | 3,738 | 1,639
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 14,840 | 2,009
Available-for-sale Securities Continuous Unrealized Loss Position Less Than 12 Months Accumulated Loss | 181 | 22
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 14,384 | 10,155
Available-for-sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Accumulated Loss | 511 | 215
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 29,224 | 12,164
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Losses | $ 692 | $ 237

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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