Fair Value Measurements (Schedule Of Estimates Of Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets:
Securities available-for-sale	$ 550,389	$ 450,083
Securities held-to-maturity	65,646	76,445
Carrying Amount
Assets:
Cash and cash equivalents	82,508	88,139
Securities available-for-sale	550,389	450,083
Securities held-to-maturity	64,449	75,169
Other securities	14,147	14,352
Net loans	3,108,574	3,026,496
Accrued interest receivable	9,223	8,408
Derivative assets	14,502	15,463
Liabilities:
Deposits	3,315,634	3,231,653
Short-term debt	252,219	248,305
Long-term debt	16,495	16,495
Derivative liabilities	14,390	15,483
Fair Value
Assets:
Cash and cash equivalents	82,508	88,139
Securities available-for-sale	550,389	450,083
Securities held-to-maturity	65,646	76,445
Other securities	14,147	14,352
Net loans	3,014,425	3,014,425
Accrued interest receivable	9,223	8,408
Derivative assets	14,502	15,463
Liabilities:
Deposits	3,309,910	3,232,970
Short-term debt	252,219	248,305
Long-term debt	16,444	16,455
Derivative liabilities	14,390	15,483
Level 1
Assets:
Cash and cash equivalents	82,508	88,139
Securities available-for-sale	7,188	5,720
Securities held-to-maturity	0	0
Other securities	0	0
Net loans	0	0
Accrued interest receivable	9,223	8,408
Derivative assets	0	0
Liabilities:
Deposits	2,232,159	2,190,234
Short-term debt	0	0
Long-term debt	0	0
Derivative liabilities	0	0
Level 2
Assets:
Cash and cash equivalents	0	0
Securities available-for-sale	542,940	441,828
Securities held-to-maturity	65,646	76,445
Other securities	14,147	14,352
Net loans	0	0
Accrued interest receivable	0	0
Derivative assets	14,502	15,463
Liabilities:
Deposits	1,077,751	1,042,736
Short-term debt	252,219	248,305
Long-term debt	16,444	16,455
Derivative liabilities	14,390	15,483
Level 3
Assets:
Cash and cash equivalents	0	0
Securities available-for-sale	261	2,535
Securities held-to-maturity	0	0
Other securities	0	0
Net loans	3,090,471	3,014,425
Accrued interest receivable	0	0
Derivative assets	0	0
Liabilities:
Deposits	0	0
Short-term debt	0	0
Long-term debt	0	0
Derivative liabilities	$ 0	$ 0