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Investment Securities (Gross Unrealized Losses and Fair Value by Length of Continuous Unrealized Loss Position) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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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 | $ 124,791 | $ 134,172
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses | 3,515 | 1,153
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value | 41,846 | 34,837
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses | 1,747 | 742
Available-for-sale securities, continuous unrealized loss position, fair value | 166,637 | 169,009
Available-for-sale securities, continuous unrealized loss position, unrealized losses | 5,262 | 1,895
Equity [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value |  | 666
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses |  | 8
Available-for-sale securities, continuous unrealized loss position, fair value |  | 666
Available-for-sale securities, continuous unrealized loss position, unrealized losses |  | 8
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 | 34,287 | 37,550
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses | 702 | 453
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value | 6,845 | 5,956
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses | 156 | 44
Available-for-sale securities, continuous unrealized loss position, fair value | 41,132 | 43,506
Available-for-sale securities, continuous unrealized loss position, unrealized losses | 858 | 497
Held-to-maturity securities, continuous unrealized loss position, less than 12 Months, fair value | 2,979 |
Held-to-maturity securities, continuous unrealized loss position, less than 12 Months, unrealized losses | 20 |
Held-to-maturity securities, continuous unrealized loss position, more than 12 Months, fair value | 1,756 |
Held-to-maturity securities, continuous unrealized loss position, more than 12 Months, unrealized losses | 10 |
Held-to-maturity securities, continuous unrealized loss position, fair value | 4,735 |
Held-to-maturity securities, continuous unrealized loss position, unrealized losses | 30 |
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 | 90,504 | 96,622
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses | 2,813 | 700
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value | 35,001 | 28,215
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses | 1,591 | 690
Available-for-sale securities, continuous unrealized loss position, fair value | 125,505 | 124,837
Available-for-sale securities, continuous unrealized loss position, unrealized losses | $ 4,404 | $ 1,390

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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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