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Investments (Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 586,690 | $ 551,103
Gross Unrealized Gains | 526 | 7,211
Gross Unrealized Losses | 24,213 | 7,925
Estimated Fair Value | 563,003 | 550,389
U.S Treasuries and U.S. Government Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1 | 2
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 1 | 2
Obligations Of States And Political Subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 92,972 | 94,552
Gross Unrealized Gains | 265 | 2,051
Gross Unrealized Losses | 1,673 | 407
Estimated Fair Value | 91,564 | 96,196
U.S. Government Agencies Mortgage-backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 469,810 | 425,559
Gross Unrealized Gains | 222 | 1,093
Gross Unrealized Losses | 22,286 | 7,305
Estimated Fair Value | 447,746 | 419,347
Private Label |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 523 | 649
Gross Unrealized Gains | 6 | 3
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 529 | 652
Trust Preferred Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 4,772 | 4,764
Gross Unrealized Gains | 26 | 26
Gross Unrealized Losses | 0 | 54
Estimated Fair Value | 4,798 | 4,736
Corporate Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 17,086 | 21,916
Gross Unrealized Gains | 7 | 475
Gross Unrealized Losses | 172 | 123
Estimated Fair Value | 16,921 | 22,268
Debt Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 585,164 | 547,442
Gross Unrealized Gains | 526 | 3,648
Gross Unrealized Losses | 24,131 | 7,889
Estimated Fair Value | 561,559 | 543,201
Equity Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 2,136
Gross Unrealized Gains |  | 3,563
Gross Unrealized Losses |  | 0
Estimated Fair Value |  | 5,699
Money Market Funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,526 | 1,525
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 82 | 36
Estimated Fair Value | $ 1,444 | $ 1,489

X
- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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