Fair Value Measurements (Schedule Of Estimates Of Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets:
Securities available-for-sale	$ 504,660	$ 450,083
Securities held-to-maturity	69,798	75,169
Other securities	16,039	14,352
Accrued interest receivable	8,122	8,408
Liabilities:
Deposits	3,278,147	3,231,653
Carrying Amount [Member]
Assets:
Cash and cash equivalents	82,360	88,139
Securities available-for-sale	504,660	450,083
Securities held-to-maturity	69,798	75,169
Other securities	16,039	14,352
Net loans	3,064,704	3,026,496
Accrued interest receivable	8,122	8,408
Derivative assets	14,816	15,463
Liabilities:
Deposits	3,278,147	3,231,653
Short-term debt	224,304	248,305
Long-term debt	16,495	16,495
Derivative liabilities	14,807	15,483
Fair Value [Member]
Assets:
Cash and cash equivalents	82,360	88,139
Securities available-for-sale	504,660	450,083
Securities held-to-maturity	71,207	76,445
Other securities	16,039	14,352
Net loans	3,007,916	3,014,425
Accrued interest receivable	8,122	8,408
Derivative assets	14,816	15,463
Liabilities:
Deposits	3,278,306	3,232,970
Short-term debt	221,473	248,305
Long-term debt	16,453	16,455
Derivative liabilities	14,807	15,483
Level 1 [Member]
Assets:
Cash and cash equivalents	82,360	88,139
Securities available-for-sale	6,397	5,720
Securities held-to-maturity	0	0
Other securities	0	0
Net loans	0	0
Accrued interest receivable	8,122	8,408
Derivative assets	0	0
Liabilities:
Deposits	2,208,215	2,190,234
Short-term debt	0	0
Long-term debt	0	0
Derivative liabilities	0	0
Level 2 [Member]
Assets:
Cash and cash equivalents	0	0
Securities available-for-sale	498,003	441,828
Securities held-to-maturity	71,207	76,445
Other securities	16,039	14,352
Net loans	0	0
Accrued interest receivable	0	0
Derivative assets	14,816	15,463
Liabilities:
Deposits	1,070,091	1,042,736
Short-term debt	221,473	248,305
Long-term debt	16,453	16,455
Derivative liabilities	14,807	15,483
Level 3 [Member]
Assets:
Cash and cash equivalents	0	0
Securities available-for-sale	260	2,535
Securities held-to-maturity	0	0
Other securities	0	0
Net loans	3,007,916	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