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Investments (Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Securities available-for-sale, amortized cost | $ 551,103 | $ 453,697
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 7,211 | 5,488
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 7,925 | 9,102
Securities available-for-sale | 550,389 | 450,083
U.S. Government agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available-for-sale, amortized cost | 2 | 3
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 0 | 0
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 0 | 0
Securities available-for-sale | 2 | 3
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available-for-sale, amortized cost | 94,552 | 83,248
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 2,051 | 594
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 407 | 1,474
Securities available-for-sale | 96,196 | 82,368
U.S. Government agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available-for-sale, amortized cost | 425,559 | 335,867
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 1,093 | 1,507
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 7,305 | 6,560
Securities available-for-sale | 419,347 | 330,814
Private label |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available-for-sale, amortized cost | 649 | 941
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 3 | 1
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 0 | 0
Securities available-for-sale | 652 | 942
Trust preferred securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available-for-sale, amortized cost | 4,764 | 6,052
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 26 | 1,164
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 54 | 554
Securities available-for-sale | 4,736 | 6,662
Corporate securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available-for-sale, amortized cost | 21,916 | 23,925
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 475 | 127
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 123 | 478
Securities available-for-sale | 22,268 | 23,574
Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available-for-sale, amortized cost | 547,442 | 450,036
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 3,648 | 3,393
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 7,889 | 9,066
Securities available-for-sale | 543,201 | 444,363
Equity Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available-for-sale, amortized cost | 2,136 | 2,136
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 3,563 | 2,095
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 0 | 0
Securities available-for-sale | 5,699 | 4,231
Investment funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available-for-sale, amortized cost | 1,525 | 1,525
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 0 | 0
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 36 | 36
Securities available-for-sale | $ 1,489 | $ 1,489

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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