Acquisitions (Schedule Of Assets Acquired And Liabilities Assumed ) (Details) - USD ($) $ in Thousands	Dec. 14, 2016	Oct. 09, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Loans		$ 202,400
Core deposit intangible		2,700
Total Deposits		245,200
Purchase price	$ 564,400
Goodwill		12,300	$ 13,545	$ 13,467	$ 1,942,034
Bancshares [Member]
Business Acquisition [Line Items]
Cash and due from banks		5,874
Interest-bearing deposits with other banks		17,196
Federal funds sold		9,629
Cash and cash equivalents		32,699
Investment securities		34,578
Loans		202,433
Total loans receivable		202,433
Bank premises and equipment, net		5,582
Cash value of life insurance		7,153
Accrued interest receivable		790
Deferred tax asset		1,665
Core deposit intangible		2,701
Other assets		1,644
Total assets acquired		289,245
Demand and non-interest bearing		101,464
Savings and interest-bearing transaction accounts		59,356
Time deposits		84,410
Total Deposits		245,230
Other borrowings		7,180
Accrued interest payable and other liabilities		2,153
Subordinated debentures		5,155
Total liabilities assumed		259,718
Total liabilities and equity assumed		259,718
Net assets acquired		29,527
Purchase price		41,781
Goodwill		12,254
Bancshares [Member] | Acquired From Bancshares [Member]
Business Acquisition [Line Items]
Cash and due from banks		5,874
Interest-bearing deposits with other banks		17,196
Federal funds sold		9,629
Cash and cash equivalents		32,699
Investment securities		34,762
Loans		210,223
Allowance for loan losses		4,298
Total loans receivable		205,925
Bank premises and equipment, net		4,241
Cash value of life insurance		7,153
Accrued interest receivable		790
Deferred tax asset		1,650
Core deposit intangible		55
Other assets		1,644
Total assets acquired		288,919
Demand and non-interest bearing		101,464
Savings and interest-bearing transaction accounts		59,356
Time deposits		84,410
Total Deposits		245,230
Other borrowings		7,180
Accrued interest payable and other liabilities		1,833
Subordinated debentures		5,155
Total liabilities assumed		259,398
Equity		31,158
Total equity assumed		31,158
Total liabilities and equity assumed		290,556
Bancshares [Member] | Fair Value Adjustments [Member]
Business Acquisition [Line Items]
Investment securities		(184)
Loans		(7,790)
Allowance for loan losses		(4,298)
Total loans receivable		(3,492)
Bank premises and equipment, net		1,341
Deferred tax asset		15
Core deposit intangible		2,646
Total assets acquired		326
Accrued interest payable and other liabilities		320
Total liabilities assumed		320
Equity		(31,158)
Total equity assumed		(31,158)
Total liabilities and equity assumed		$ (30,838)