Fair Value Measurements (Schedule Of Estimates Of Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets:
Securities available-for-sale	$ 934,113	$ 810,106
Securities held-to-maturity	0	49,036
Other securities	26,827	28,490
Net loans	3,588,657	3,604,510
Accrued interest receivable	12,570	11,569
Liabilities:
Deposits	4,052,053	4,075,894
Carrying Amount
Assets:
Cash and cash equivalents	110,636	140,144
Securities available-for-sale	934,113	810,106
Securities held-to-maturity		49,036
Other securities	10,233	12,634
Net loans	3,588,657	3,604,510
Accrued interest receivable	12,570	11,569
Derivative assets	62,118	19,310
Liabilities:
Deposits	4,052,053	4,075,894
Short-term debt	234,147	211,255
Long-term debt	0	4,056
Interest Payable	2,613	2,849
Derivative liabilities	62,462	19,380
Fair Value
Assets:
Cash and cash equivalents	110,636	140,144
Securities available-for-sale	934,113	810,106
Securities held-to-maturity		50,598
Other securities	10,233	12,634
Net loans	3,576,504	3,574,435
Accrued interest receivable	12,570	11,569
Derivative assets	62,118	19,310
Liabilities:
Deposits	4,081,662	4,094,493
Short-term debt	224,247	211,255
Long-term debt	0	4,124
Interest Payable	2,613	2,849
Derivative liabilities	62,462	19,380
Level 1
Assets:
Cash and cash equivalents	110,636	140,144
Securities available-for-sale	0	0
Securities held-to-maturity		0
Other securities	6,073	7,787
Net loans	0	0
Accrued interest receivable	12,570	11,569
Derivative assets	0	0
Liabilities:
Deposits	2,685,076	2,711,323
Short-term debt	0	0
Long-term debt	0	0
Interest Payable	2,613	2,849
Derivative liabilities	0	0
Level 2
Assets:
Cash and cash equivalents	0	0
Securities available-for-sale	924,777	800,400
Securities held-to-maturity		50,598
Other securities	4,160	4,847
Net loans	0	0
Accrued interest receivable	0	0
Derivative assets	62,118	19,310
Liabilities:
Deposits	1,396,586	1,383,170
Short-term debt	224,247	211,255
Long-term debt	0	4,124
Interest Payable	0	0
Derivative liabilities	62,462	19,380
Level 3
Assets:
Cash and cash equivalents	0	0
Securities available-for-sale	9,336	9,706
Securities held-to-maturity		0
Other securities	0	0
Net loans	3,576,504	3,574,435
Accrued interest receivable	0	0
Derivative assets	0	0
Liabilities:
Deposits	0	0
Short-term debt	0	0
Long-term debt	0	0
Interest Payable	0	0
Derivative liabilities	$ 0	$ 0