Fair Value Measurements (Schedule Of Estimates Of Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets:
Securities available-for-sale	$ 1,055,185	$ 810,106
Securities held-to-maturity	0	49,036
Other securities	26,144	28,490
Net loans	3,640,397	3,604,510
Accrued interest receivable	14,200	11,569
Liabilities:
Liabilities:	4,411,115	4,075,894
Carrying Amount
Assets:
Cash and cash equivalents	373,254	140,144
Securities available-for-sale	1,055,185	810,106
Securities held-to-maturity		49,036
Other securities	10,474	12,634
Net loans	3,640,397	3,604,510
Accrued interest receivable	14,200	11,569
Derivative assets	66,161	19,310
Liabilities:
Liabilities:	4,411,115	4,075,894
Short-term debt	282,676	211,255
Long-term debt		4,056
Accrued interest payable	2,257	2,849
Derivative liabilities	66,526	19,380
Fair Value
Assets:
Cash and cash equivalents	373,254	140,144
Securities available-for-sale	1,055,185	810,106
Securities held-to-maturity		50,598
Other securities	10,474	12,634
Net loans	3,634,170	3,574,435
Accrued interest receivable	14,200	11,569
Derivative assets	66,161	19,310
Liabilities:
Liabilities:	4,444,930	4,094,493
Short-term debt	267,186	211,255
Long-term debt		4,124
Accrued interest payable	2,257	2,849
Derivative liabilities	66,526	19,380
Level 1
Assets:
Cash and cash equivalents	373,254	140,144
Securities available-for-sale	0	0
Securities held-to-maturity		0
Other securities	5,960	7,787
Net loans	0	0
Accrued interest receivable	14,200	11,569
Derivative assets	0	0
Liabilities:
Liabilities:	3,068,484	2,711,323
Short-term debt	0	0
Long-term debt		0
Accrued interest payable	2,257	2,849
Derivative liabilities	0	0
Level 2
Assets:
Cash and cash equivalents	0	0
Securities available-for-sale	1,045,773	800,400
Securities held-to-maturity		50,598
Other securities	4,514	4,847
Net loans	0	0
Accrued interest receivable	0	0
Derivative assets	66,161	19,310
Liabilities:
Liabilities:	1,376,446	1,383,170
Short-term debt	267,186	211,255
Long-term debt		4,124
Accrued interest payable	0	0
Derivative liabilities	66,526	19,380
Level 3
Assets:
Cash and cash equivalents	0	0
Securities available-for-sale	9,412	9,706
Securities held-to-maturity		0
Other securities	0	0
Net loans	3,634,170	3,574,435
Accrued interest receivable	0	0
Derivative assets	0	0
Liabilities:
Liabilities:	0	0
Short-term debt	0	0
Long-term debt		0
Accrued interest payable	0	0
Derivative liabilities	$ 0	$ 0