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Investments (Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,006,424	$ 794,117
Gross Unrealized Gains	50,754	18,210
Gross Unrealized Losses	1,993	2,221
Estimated Fair Value	1,055,185	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	211,439	112,393
Gross Unrealized Gains	7,383	4,800
Gross Unrealized Losses	595	6
Estimated Fair Value	218,227	117,187
Mortgage-backed securities: U.S. government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	746,148	631,637
Gross Unrealized Gains	40,638	12,292
Gross Unrealized Losses	279	1,825
Estimated Fair Value	786,507	642,104
Mortgage-backed securities: Private label
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,477	10,896
Gross Unrealized Gains	876	589
Gross Unrealized Losses	4	0
Estimated Fair Value	11,349	11,485
Trust preferred securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,551	4,781
Gross Unrealized Gains	0	27
Gross Unrealized Losses	1,071	347
Estimated Fair Value	3,480	4,461
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	31,568	31,669
Gross Unrealized Gains	1,857	500
Gross Unrealized Losses	44	43
Estimated Fair Value	33,381	32,126
Total Debt Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,004,183	791,876
Gross Unrealized Gains	50,754	18,210
Gross Unrealized Losses	1,993	2,221
Estimated Fair Value	1,052,944	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

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

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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)
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