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Investments (Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Securities available-for-sale, amortized cost | $ 734,378 | $ 551,103
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 3,153 | 7,211
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 14,277 | 7,925
Securities available-for-sale | 723,254 | 550,389
U.S. Government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available-for-sale, amortized cost | 5,713 | 2
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 20 | 0
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 0 | 0
Securities available-for-sale | 5,733 | 2
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available-for-sale, amortized cost | 128,089 | 94,552
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 1,033 | 2,051
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 1,052 | 407
Securities available-for-sale | 128,070 | 96,196
U.S. Government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available-for-sale, amortized cost | 561,799 | 425,559
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 1,950 | 1,093
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 12,991 | 7,305
Securities available-for-sale | 550,758 | 419,347
Private label |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available-for-sale, amortized cost | 11,948 | 649
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 95 | 3
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 0 | 0
Securities available-for-sale | 12,043 | 652
Trust preferred securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available-for-sale, amortized cost | 4,774 | 4,764
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 25 | 26
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 0 | 54
Securities available-for-sale | 4,799 | 4,736
Corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available-for-sale, amortized cost | 16,795 | 21,916
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 30 | 475
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 167 | 123
Securities available-for-sale | 16,658 | 22,268
Debt Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available-for-sale, amortized cost | 729,118 | 547,442
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 3,153 | 3,648
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 14,210 | 7,889
Securities available-for-sale | 718,061 | 543,201
Equity Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available-for-sale, amortized cost |  | 2,136
Available-for-sale debt securities, accumulated gross unrealized gain, before tax |  | 3,563
Available-for-sale debt securities, accumulated gross unrealized loss, before tax |  | 0
Securities available-for-sale |  | 5,699
Certificates of Deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available-for-sale, amortized cost | 3,735 |
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 0 |
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 0 |
Securities available-for-sale | 3,735 |
Investment funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available-for-sale, amortized cost | 1,525 | 1,525
Available-for-sale debt securities, accumulated gross unrealized gain, before tax | 0 | 0
Available-for-sale debt securities, accumulated gross unrealized loss, before tax | 67 | 36
Securities available-for-sale | $ 1,458 | $ 1,489

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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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=82897076&loc=d3e27161-111563 + Details
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