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Investment Securities (Gross Unrealized Losses and Fair Value by Length of Continuous Unrealized Loss Position) (Details) - USD ($) $ in Thousands | Mar. 31, 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 | $ 144,333 | $ 134,172
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses | 3,514 | 1,153
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value | 29,416 | 34,837
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses | 1,185 | 742
Available-for-sale securities, continuous unrealized loss position, fair value | 173,749 | 169,009
Available-for-sale securities, continuous unrealized loss position, unrealized losses | 4,699 | 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 | 37,263 | 37,550
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses | 740 | 453
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value | 2,949 | 5,956
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses | 52 | 44
Available-for-sale securities, continuous unrealized loss position, fair value | 40,212 | 43,506
Available-for-sale securities, continuous unrealized loss position, unrealized losses | 792 | 497
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 | 107,070 | 96,622
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses | 2,774 | 700
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value | 26,467 | 28,215
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses | 1,133 | 690
Available-for-sale securities, continuous unrealized loss position, fair value | 133,537 | 124,837
Available-for-sale securities, continuous unrealized loss position, unrealized losses | $ 3,907 | $ 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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- 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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