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Investment Securities Available-for-Sale (Details 1) $ in Thousands | Sep. 30, 2017 USD ($) Number | Dec. 31, 2016 USD ($) Number
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Available-for-sale securities in a continuous loss position, number of securities | Number | 150 | 157
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value | $ 309,803 | $ 361,079
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses | 2,743 | 5,285
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value | 84,219 | 23,170
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses | 1,570 | 619
Available-for-sale securities in a continuous loss position, estimated fair value | 394,022 | 384,249
Available-for-sale securities in a continuous loss position, unrealized losses | $ 4,313 | $ 5,904
US Agency Securities [Member] |  |
Available-for-sale securities in a continuous loss position, number of securities | Number | 32 | 27
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value | $ 97,832 | $ 88,991
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses | 1,101 | 1,764
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value | 28,299 | 3,768
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses | 423 | 38
Available-for-sale securities in a continuous loss position, estimated fair value | 126,131 | 92,759
Available-for-sale securities in a continuous loss position, unrealized losses | $ 1,524 | $ 1,802
Residential Mortgage Backed Securities [Member] |  |
Available-for-sale securities in a continuous loss position, number of securities | Number | 113 | 112
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value | $ 198,670 | $ 232,347
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses | 1,523 | 3,110
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value | 55,920 | 19,402
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses | 1,147 | 581
Available-for-sale securities in a continuous loss position, estimated fair value | 254,590 | 251,749
Available-for-sale securities in a continuous loss position, unrealized losses | $ 2,670 | $ 3,691
Municipal Bonds [Member] |  |
Available-for-sale securities in a continuous loss position, number of securities | Number | 5 | 16
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value | $ 13,301 | $ 34,743
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses | 119 | 400
Available-for-sale securities in a continuous loss position, estimated fair value | 13,301 | 34,743
Available-for-sale securities in a continuous loss position, unrealized losses | $ 119 | $ 400
Corporate Bonds [Member] |  |
Available-for-sale securities in a continuous loss position, number of securities | Number |  | 2
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value |  | $ 4,998
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses |  | 11
Available-for-sale securities in a continuous loss position, estimated fair value |  | 4,998
Available-for-sale securities in a continuous loss position, unrealized losses |  | $ 11

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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 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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