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Investment Securities (Gross Unrealized Losses and Fair Value by Length of Continuous Unrealized Loss Position) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | $ 100,932 | $ 112,803
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses | 439 | 1,616
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value | 14,084 | 9,208
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses | 295 | 263
Available-for-sale securities, continuous unrealized loss position, fair value | 115,016 | 122,011
Available-for-sale securities, continuous unrealized loss position, unrealized losses | 734 | 1,879
Equity [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value |  | 640
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses |  | 12
Available-for-sale securities, continuous unrealized loss position, fair value |  | 640
Available-for-sale securities, continuous unrealized loss position, unrealized losses |  | 12
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | 40,819 | 11,926
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses | 150 | 58
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value | 2,998 |
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses | 4 |
Available-for-sale securities, continuous unrealized loss position, fair value | 43,817 | 11,926
Available-for-sale securities, continuous unrealized loss position, unrealized losses | 154 | 58
Mortgage-backed [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | 60,113 | 100,237
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses | 289 | 1,546
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value | 11,086 | 9,208
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses | 291 | 263
Available-for-sale securities, continuous unrealized loss position, fair value | 71,199 | 109,445
Available-for-sale securities, continuous unrealized loss position, unrealized losses | $ 580 | $ 1,809

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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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