Fair Value Measurements (Schedule Of Estimates Of Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets:
Securities available-for-sale	$ 545,628	$ 550,389
Securities held-to-maturity	62,277	64,449
Other securities	22,165	14,147
Accrued interest receivable	9,528	9,223
Liabilities:
Deposits	3,446,962	3,315,634
Carrying Amount
Assets:
Cash and cash equivalents	123,778	82,508
Securities available-for-sale	545,628	550,389
Securities held-to-maturity	62,277	64,449
Other securities	22,165	14,147
Net loans	3,119,300	3,108,574
Accrued interest receivable	9,528	9,223
Derivative assets	21,752	14,502
Liabilities:
Deposits	3,446,962	3,315,634
Short-term debt	195,375	252,219
Long-term debt	16,495	16,495
Derivative liabilities	21,491	14,390
Fair Value
Assets:
Cash and cash equivalents	123,778	82,508
Securities available-for-sale	545,628	550,389
Securities held-to-maturity	62,146	65,646
Other securities	22,165	14,147
Net loans	3,076,380	3,014,425
Accrued interest receivable	9,528	9,223
Derivative assets	21,752	14,502
Liabilities:
Deposits	3,437,168	3,309,910
Short-term debt	195,375	252,219
Long-term debt	16,432	16,444
Derivative liabilities	21,491	14,390
Level 1
Assets:
Cash and cash equivalents	123,778	82,508
Securities available-for-sale	1,465	7,188
Securities held-to-maturity	0	0
Other securities	10,584	0
Net loans	0	0
Accrued interest receivable	9,528	9,223
Derivative assets	0	0
Liabilities:
Deposits	2,336,430	2,232,159
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	543,902	542,940
Securities held-to-maturity	62,146	65,646
Other securities	11,581	14,147
Net loans	0	0
Accrued interest receivable	0	0
Derivative assets	21,752	14,502
Liabilities:
Deposits	1,100,738	1,077,751
Short-term debt	195,375	252,219
Long-term debt	16,432	16,444
Derivative liabilities	21,491	14,390
Level 3
Assets:
Cash and cash equivalents	0	0
Securities available-for-sale	261	261
Securities held-to-maturity	0	0
Other securities	0	0
Net loans	3,076,380	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