Fair Value Measurements (Schedule Of Estimates Of Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets:
Securities available-for-sale	$ 525,633	$ 450,083
Securities held-to-maturity	66,989	75,169
Other securities	15,988	14,352
Accrued interest receivable	9,236	8,408
Liabilities:
Deposits	3,256,534	3,231,653
Carrying Amount
Assets:
Cash and cash equivalents	83,165	88,139
Securities available-for-sale	525,633	450,083
Securities held-to-maturity	66,989	75,169
Other securities	15,988	14,352
Net loans	3,086,358	3,026,496
Accrued interest receivable	9,236	8,408
Derivative assets	14,473	15,463
Liabilities:
Deposits	3,256,534	3,231,653
Short-term debt	281,464	248,305
Long-term debt	16,495	16,495
Derivative liabilities	14,458	15,483
Fair Value
Assets:
Cash and cash equivalents	83,165	88,139
Securities available-for-sale	525,633	450,083
Securities held-to-maturity	68,478	76,445
Other securities	15,988	14,352
Net loans	3,076,108	3,014,425
Accrued interest receivable	9,236	8,408
Derivative assets	14,473	15,463
Liabilities:
Deposits	3,255,343	3,232,970
Short-term debt	281,464	248,305
Long-term debt	16,452	16,455
Derivative liabilities	14,458	15,483
Level 1
Assets:
Cash and cash equivalents	83,165	88,139
Securities available-for-sale	6,516	5,720
Securities held-to-maturity	0	0
Other securities	0	0
Net loans	0	0
Accrued interest receivable	9,236	8,408
Derivative assets	0	0
Liabilities:
Deposits	2,180,589	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	518,856	441,828
Securities held-to-maturity	68,478	76,445
Other securities	15,988	14,352
Net loans	0	0
Accrued interest receivable	0	0
Derivative assets	14,473	15,463
Liabilities:
Deposits	1,074,754	1,042,736
Short-term debt	281,464	248,305
Long-term debt	16,452	16,455
Derivative liabilities	14,458	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	3,076,108	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