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Investments (Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 754,954 | $ 734,378
Gross Unrealized Gains | 7,978 | 3,153
Gross Unrealized Losses | 7,851 | 14,277
Estimated Fair Value | 755,081 | 723,254
U.S Treasuries and U.S. Government Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,277 | 5,713
Gross Unrealized Gains | 23 | 20
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 2,300 | 5,733
Obligations Of States And Political Subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 123,293 | 128,089
Gross Unrealized Gains | 2,632 | 1,033
Gross Unrealized Losses | 285 | 1,052
Estimated Fair Value | 125,640 | 128,070
U.S. Government Agencies Mortgage-backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 590,773 | 561,799
Gross Unrealized Gains | 4,871 | 1,950
Gross Unrealized Losses | 6,946 | 12,991
Estimated Fair Value | 588,698 | 550,758
Private Label |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 11,787 | 11,948
Gross Unrealized Gains | 328 | 95
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 12,115 | 12,043
Trust Preferred Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 4,776 | 4,774
Gross Unrealized Gains | 31 | 25
Gross Unrealized Losses | 569 | 0
Estimated Fair Value | 4,238 | 4,799
Corporate Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 16,787 | 16,795
Gross Unrealized Gains | 93 | 30
Gross Unrealized Losses | 1 | 167
Estimated Fair Value | 16,879 | 16,658
Debt Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 749,693 | 729,118
Gross Unrealized Gains | 7,978 | 3,153
Gross Unrealized Losses | 7,801 | 14,210
Estimated Fair Value | 749,870 | 718,061
Certificates of Deposit [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 3,735 | 3,735
Estimated Fair Value | 3,735 | 3,735
Money Market Funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,526 | 1,525
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 50 | 67
Estimated Fair Value | $ 1,476 | $ 1,458

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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