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Investment Securities Available-for-Sale (Details 1) $ in Thousands | Mar. 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 | 205 | 183
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value | $ 296,120 | $ 272,060
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses | 6,409 | 2,593
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value | 200,808 | 203,046
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses | 6,689 | 4,453
Available-for-sale securities in a continuous loss position, estimated fair value | 496,928 | 475,106
Available-for-sale securities in a continuous loss position, unrealized losses | $ 13,098 | $ 7,046
US Agency Securities [Member] |  |
Available-for-sale securities in a continuous loss position, number of securities | Number | 44 | 38
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value | $ 113,476 | $ 102,264
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses | 2,469 | 1,073
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value | 54,634 | 55,093
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses | 1,780 | 1,341
Available-for-sale securities in a continuous loss position, estimated fair value | 168,110 | 157,357
Available-for-sale securities in a continuous loss position, unrealized losses | $ 4,249 | $ 2,414
Residential Mortgage Backed Securities [Member] |  |
Available-for-sale securities in a continuous loss position, number of securities | Number | 148 | 137
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value | $ 159,464 | $ 152,350
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses | 3,326 | 1,306
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value | 146,174 | 147,953
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses | 4,909 | 3,112
Available-for-sale securities in a continuous loss position, estimated fair value | 305,638 | 300,303
Available-for-sale securities in a continuous loss position, unrealized losses | $ 8,235 | $ 4,418
Municipal Bonds [Member] |  |
Available-for-sale securities in a continuous loss position, number of securities | Number | 13 | 8
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value | $ 23,180 | $ 17,446
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses | 614 | 214
Available-for-sale securities in a continuous loss position, estimated fair value | 23,180 | 17,446
Available-for-sale securities in a continuous loss position, unrealized losses | $ 614 | $ 214

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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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 less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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