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Investments (Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Total | $ 1,604,706 | $ 1,673,864
Gross Unrealized Gains | 1,033 | 645
Gross Unrealized Losses | 149,480 | 168,989
Estimated Fair Value | 1,456,259 | 1,505,520
Certificates of deposit, at carrying value | 500 | 700
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 247,589 | 292,293
Gross Unrealized Gains | 487 | 346
Gross Unrealized Losses | 19,202 | 24,324
Estimated Fair Value | 228,874 | 268,315
U.S. government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 1,318,398 | 1,342,666
Gross Unrealized Gains | 546 | 299
Gross Unrealized Losses | 126,984 | 140,686
Estimated Fair Value | 1,191,960 | 1,202,279
Private label |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 7,554 | 7,695
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 401 | 464
Estimated Fair Value | 7,153 | 7,231
Trust preferred securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 4,592 | 4,590
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 467 | 762
Estimated Fair Value | 4,125 | 3,828
Corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 26,573 | 26,620
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 2,426 | 2,753
Estimated Fair Value | $ 24,147 | $ 23,867

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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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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- Definition Amortized cost of 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://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 + Details
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- Definition A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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