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Investments (Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Securities available-for-sale, amortized cost | $ 1,130,155 | $ 794,117
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 49,336 | 18,210
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 702 | 2,221
Available-for-sale Securities | 1,178,789 | 810,106
U.S. Government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available-for-sale, amortized cost | 0 | 500
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 0 | 2
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 0 | 0
Available-for-sale Securities | 0 | 502
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available-for-sale, amortized cost | 266,483 | 112,393
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 11,467 | 4,800
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 139 | 6
Available-for-sale Securities | 277,811 | 117,187
U.S. Government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available-for-sale, amortized cost | 815,682 | 631,637
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 34,807 | 12,292
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 105 | 1,825
Available-for-sale Securities | 850,384 | 642,104
Private label |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available-for-sale, amortized cost | 9,976 | 10,896
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 916 | 589
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 0 | 0
Available-for-sale Securities | 10,892 | 11,485
Trust preferred securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available-for-sale, amortized cost | 4,557 | 4,781
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 0 | 27
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 457 | 347
Available-for-sale Securities | 4,100 | 4,461
Corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available-for-sale, amortized cost | 31,465 | 31,669
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 2,146 | 500
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 1 | 43
Available-for-sale Securities | 33,610 | 32,126
Debt Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available-for-sale, amortized cost | 1,128,163 | 791,876
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 49,336 | 18,210
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 702 | 2,221
Available-for-sale Securities | 1,176,797 | 807,865
Certificates of Deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available-for-sale, amortized cost | 1,992 | 2,241
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 0 | 0
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 0 | 0
Available-for-sale Securities | $ 1,992 | $ 2,241

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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- 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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