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Investments (Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,109,274 | $ 794,117
Gross Unrealized Gains | 49,689 | 18,210
Gross Unrealized Losses | 1,564 | 2,221
Estimated Fair Value | 1,157,399 | 810,106
U.S Treasuries and U.S. Government Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 0 | 500
Gross Unrealized Gains | 0 | 2
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 0 | 502
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 255,677 | 112,393
Gross Unrealized Gains | 8,369 | 4,800
Gross Unrealized Losses | 744 | 6
Estimated Fair Value | 263,302 | 117,187
Mortgage-backed securities: U.S. government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 804,912 | 631,637
Gross Unrealized Gains | 38,459 | 12,292
Gross Unrealized Losses | 138 | 1,825
Estimated Fair Value | 843,233 | 642,104
Mortgage-backed securities: Private label |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 10,375 | 10,896
Gross Unrealized Gains | 1,002 | 589
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 11,377 | 11,485
Trust preferred securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 4,554 | 4,781
Gross Unrealized Gains | 0 | 27
Gross Unrealized Losses | 662 | 347
Estimated Fair Value | 3,892 | 4,461
Corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 31,515 | 31,669
Gross Unrealized Gains | 1,859 | 500
Gross Unrealized Losses | 20 | 43
Estimated Fair Value | 33,354 | 32,126
Total Debt Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,107,033 | 791,876
Gross Unrealized Gains | 49,689 | 18,210
Gross Unrealized Losses | 1,564 | 2,221
Estimated Fair Value | 1,155,158 | 807,865
Certificates of deposit held for investment |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,241 | 2,241
Estimated Fair Value | $ 2,241 | $ 2,241

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- 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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- 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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