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Securities Continuous Unrealized Loss (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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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 | $ 0 | $ 31,889
Available-for-sale Securities Continuous Unrealized Loss Position Less than 12 Months Aggregate Losses | 0 | 447
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 169,935 | 157,875
Available-for-sale Securities Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses | 3,132 | 5,183
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 169,935 | 189,764
Available-for-sale Securities Continuous Unrealized Loss Position Aggregate Losses | 3,132 | 5,630
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 | 0 | 4,724
Available-for-sale Securities Continuous Unrealized Loss Position Less than 12 Months Aggregate Losses | 0 | 28
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 49,159 | 44,307
Available-for-sale Securities Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses | 763 | 1,172
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 49,159 | 49,031
Available-for-sale Securities Continuous Unrealized Loss Position Aggregate Losses | 763 | 1,200
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 | 0 | 12,325
Available-for-sale Securities Continuous Unrealized Loss Position Less than 12 Months Aggregate Losses | 0 | 238
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 107,503 | 99,184
Available-for-sale Securities Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses | 2,143 | 3,500
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 107,503 | 111,509
Available-for-sale Securities Continuous Unrealized Loss Position Aggregate Losses | 2,143 | 3,738
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 | 0 | 14,840
Available-for-sale Securities Continuous Unrealized Loss Position Less than 12 Months Aggregate Losses | 0 | 181
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 13,273 | 14,384
Available-for-sale Securities Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses | 226 | 511
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 13,273 | 29,224
Available-for-sale Securities Continuous Unrealized Loss Position Aggregate Losses | $ 226 | $ 692

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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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