Fair Value Measurements (Schedule Of Estimates Of Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets:
Securities available-for-sale	$ 552,603	$ 550,389
Securities held-to-maturity	60,030	64,449
Other securities	28,920	14,147
Accrued interest receivable	9,348	9,223
Liabilities:
Deposits	3,421,778	3,315,634
Carrying Amount
Assets:
Cash and cash equivalents	265,524	82,508
Securities available-for-sale	552,603	550,389
Securities held-to-maturity	60,030	64,449
Other securities	28,920	14,147
Net loans	3,138,592	3,108,574
Accrued interest receivable	9,348	9,223
Derivative assets	25,248	14,502
Liabilities:
Deposits	3,421,778	3,315,634
Short-term debt	378,010	252,219
Long-term debt	16,495	16,495
Derivative liabilities	24,933	14,390
Fair Value
Assets:
Cash and cash equivalents	265,524	82,508
Securities available-for-sale	552,603	550,389
Securities held-to-maturity	59,628	65,646
Other securities	28,920	14,147
Net loans	3,091,568	3,014,425
Accrued interest receivable	9,348	9,223
Derivative assets	25,248	14,502
Liabilities:
Deposits	3,426,574	3,309,910
Short-term debt	378,027	252,219
Long-term debt	16,439	16,444
Derivative liabilities	24,933	14,390
Level 1
Assets:
Cash and cash equivalents	265,524	82,508
Securities available-for-sale	1,455	7,188
Securities held-to-maturity	0	0
Other securities	11,175	0
Net loans	0	0
Accrued interest receivable	9,348	9,223
Derivative assets	0	0
Liabilities:
Deposits	2,288,094	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	550,888	542,940
Securities held-to-maturity	59,628	65,646
Other securities	17,745	14,147
Net loans	0	0
Accrued interest receivable	0	0
Derivative assets	25,248	14,502
Liabilities:
Deposits	1,138,480	1,077,751
Short-term debt	378,027	252,219
Long-term debt	16,439	16,444
Derivative liabilities	24,933	14,390
Level 3
Assets:
Cash and cash equivalents	0	0
Securities available-for-sale	260	261
Securities held-to-maturity	0	0
Other securities	0	0
Net loans	3,091,568	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