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Investment Securities Available-for-Sale (Details 1) $ in Thousands | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
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Available-for-sale securities in a continuous loss position, number of securities | 144 | 221
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value | $ 31,883 | $ 139,671
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses | 63 | 1,116
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value | 273,568 | 387,672
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses | 2,480 | 10,700
Available-for-sale securities in a continuous loss position, estimated fair value | 305,451 | 527,343
Available-for-sale securities in a continuous loss position, unrealized losses | $ 2,543 | $ 11,816
US Agency Securities [Member] |  |
Available-for-sale securities in a continuous loss position, number of securities | 39 | 58
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value | $ 26,149 | $ 72,679
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses | 50 | 533
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value | 99,252 | 144,636
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses | 609 | 3,500
Available-for-sale securities in a continuous loss position, estimated fair value | 125,401 | 217,315
Available-for-sale securities in a continuous loss position, unrealized losses | $ 659 | $ 4,033
Residential Mortgage Backed Securities [Member] |  |
Available-for-sale securities in a continuous loss position, number of securities | 103 | 151
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value | $ 4,234 | $ 61,199
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses | 13 | 527
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value | 174,316 | 225,995
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses | 1,871 | 6,766
Available-for-sale securities in a continuous loss position, estimated fair value | 178,550 | 287,194
Available-for-sale securities in a continuous loss position, unrealized losses | $ 1,884 | $ 7,293
Municipal Bonds [Member] |  |
Available-for-sale securities in a continuous loss position, number of securities | 2,000 | 11
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value | $ 1,500 | $ 4,299
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses |  | 50
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value |  | 17,041
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses |  | 434
Available-for-sale securities in a continuous loss position, estimated fair value |  | 21,340
Available-for-sale securities in a continuous loss position, unrealized losses |  | $ 484
Corporate Bonds [Member] |  |
Available-for-sale securities in a continuous loss position, number of securities |  | 1
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value |  | $ 1,494
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses |  | 6
Available-for-sale securities in a continuous loss position, estimated fair value | $ 1,500 | 1,494
Available-for-sale securities in a continuous loss position, unrealized losses |  | $ 6

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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=118939692&loc=d3e27337-111563 + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 + Details
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