Mortgage Servicing Rights (Schedule Of Changes In Carrying Value Of MSR) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance at beginning of year	$ 9,092	$ 8,435	$ 8,946
Additions from loans sold with servicing retained	13,091	1,759	213
Additions from acquisitions	0	0	704
Estimate of changes in fair value due to:
Payoffs and paydowns	(2,325)	(1,315)	(976)
Changes in valuation inputs or assumptions	(755)	213	(452)
Fair value at end of year	19,103	9,092	8,435
Unpaid principal balance of mortgage loans serviced for others	$ 1,784,760	$ 939,819	$ 877,899