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Investments (Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,157,127 | $ 1,130,155
Gross Unrealized Gains | 32,972 | 49,336
Gross Unrealized Losses | 4,854 | 702
Estimated Fair Value | 1,185,245 | 1,178,789
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 273,855 | 266,483
Gross Unrealized Gains | 7,082 | 11,467
Gross Unrealized Losses | 1,184 | 139
Estimated Fair Value | 279,753 | 277,811
Mortgage-backed securities: U.S. government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 834,608 | 815,682
Gross Unrealized Gains | 24,328 | 34,807
Gross Unrealized Losses | 3,382 | 105
Estimated Fair Value | 855,554 | 850,384
Mortgage-backed securities: Private label |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 9,691 | 9,976
Gross Unrealized Gains | 705 | 916
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 10,396 | 10,892
Trust preferred securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 4,560 | 4,557
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 285 | 457
Estimated Fair Value | 4,275 | 4,100
Corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 32,421 | 31,465
Gross Unrealized Gains | 857 | 2,146
Gross Unrealized Losses | 3 | 1
Estimated Fair Value | 33,275 | 33,610
Total Debt Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,155,135 | 1,128,163
Gross Unrealized Gains | 32,972 | 49,336
Gross Unrealized Losses | 4,854 | 702
Estimated Fair Value | 1,183,253 | 1,176,797
Certificates of deposit held for investment |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,992 | 1,992
Estimated Fair Value | $ 1,992 | $ 1,992

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=121645371&loc=d3e27161-111563 + Details
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X
- 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=121645371&loc=d3e27161-111563 + Details
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