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Investments (Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 524,128 | $ 453,697
Gross Unrealized Gains | 7,395 | 5,488
Gross Unrealized Losses | 5,890 | 9,102
Estimated Fair Value | 525,633 | 450,083
U.S Treasuries and U.S. Government Agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2 | 3
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 2 | 3
Obligations Of States And Political Subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 95,907 | 83,248
Gross Unrealized Gains | 1,835 | 594
Gross Unrealized Losses | 574 | 1,474
Estimated Fair Value | 97,168 | 82,368
U.S. Government Agencies Mortgage-backed Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 397,192 | 335,867
Gross Unrealized Gains | 1,931 | 1,507
Gross Unrealized Losses | 5,136 | 6,560
Estimated Fair Value | 393,987 | 330,814
Private Label |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 687 | 941
Gross Unrealized Gains | 3 | 1
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 690 | 942
Trust Preferred Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 4,761 | 6,052
Gross Unrealized Gains | 183 | 1,164
Gross Unrealized Losses | 0 | 554
Estimated Fair Value | 4,944 | 6,662
Corporate Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 21,918 | 23,925
Gross Unrealized Gains | 562 | 127
Gross Unrealized Losses | 154 | 478
Estimated Fair Value | 22,326 | 23,574
Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 520,467 | 450,036
Gross Unrealized Gains | 4,514 | 3,393
Gross Unrealized Losses | 5,864 | 9,066
Estimated Fair Value | 519,117 | 444,363
Equity Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,136 | 2,136
Gross Unrealized Gains | 2,881 | 2,095
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 5,017 | 4,231
Money Market Funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,525 | 1,525
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 26 | 36
Estimated Fair Value | $ 1,499 | $ 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=73527792&loc=d3e27161-111563 + Details
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