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Investment Securities Available-for-Sale (Details 1) $ in Thousands | Dec. 31, 2018 USD ($) Number | Dec. 31, 2017 USD ($) Number
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Available-for-sale securities in a continuous loss position, number of securities | Number | 221 | 183
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value | $ 139,671 | $ 272,060
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses | 1,116 | 2,593
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value | 387,672 | 203,046
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses | 10,700 | 4,453
Available-for-sale securities in a continuous loss position, estimated fair value | 527,343 | 475,106
Available-for-sale securities in a continuous loss position, unrealized losses | $ 11,816 | $ 7,046
US Agency Securities [Member] |  |
Available-for-sale securities in a continuous loss position, number of securities | Number | 58 | 38
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value | $ 72,679 | $ 102,264
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses | 533 | 1,073
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value | 144,636 | 55,093
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses | 3,500 | 1,341
Available-for-sale securities in a continuous loss position, estimated fair value | 217,315 | 157,357
Available-for-sale securities in a continuous loss position, unrealized losses | $ 4,033 | $ 2,414
Residential Mortgage Backed Securities [Member] |  |
Available-for-sale securities in a continuous loss position, number of securities | Number | 151 | 137
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value | $ 61,199 | $ 152,350
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses | 527 | 1,306
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value | 225,995 | 147,953
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses | 6,766 | 3,112
Available-for-sale securities in a continuous loss position, estimated fair value | 287,194 | 300,303
Available-for-sale securities in a continuous loss position, unrealized losses | $ 7,293 | $ 4,418
Municipal Bonds [Member] |  |
Available-for-sale securities in a continuous loss position, number of securities | Number | 11 | 8
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value | $ 4,299 | $ 17,446
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses | 50 | 214
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 | 17,446
Available-for-sale securities in a continuous loss position, unrealized losses | $ 484 | $ 214
Corporate Bonds [Member] |  |
Available-for-sale securities in a continuous loss position, number of securities | Number | 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 | 1,494 |
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=82897076&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=82897076&loc=d3e27290-111563 + Details
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