Fair Value Measurements (Schedule Of Estimates Of Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets:
Securities available-for-sale	$ 755,081	$ 723,254
Securities held-to-maturity	55,326	60,827
Other securities	26,182	28,810
Accrued interest receivable	13,657	12,424
Liabilities:
Deposits	4,043,007	3,975,559
Carrying Amount
Assets:
Cash and cash equivalents	143,850	122,991
Securities available-for-sale	755,081	723,254
Securities held-to-maturity	55,326	60,827
Other securities	26,182	28,810
Net loans	3,544,676	3,571,642
Accrued interest receivable	13,657	12,424
Derivative assets	13,582	17,100
Liabilities:
Deposits	4,043,007	3,975,559
Short-term debt	194,683	261,911
Long-term debt	4,053	4,053
Derivative liabilities	13,482	16,905
Fair Value
Assets:
Cash and cash equivalents	143,850	122,991
Securities available-for-sale	755,081	723,254
Securities held-to-maturity	56,085	60,706
Other securities	26,182	28,810
Net loans	3,513,838	3,516,557
Accrued interest receivable	13,657	12,424
Derivative assets	13,582	17,100
Liabilities:
Deposits	4,057,776	3,985,534
Short-term debt	194,683	261,911
Long-term debt	4,115	4,115
Derivative liabilities	13,482	16,905
Level 1
Assets:
Cash and cash equivalents	143,850	122,991
Securities available-for-sale	1,476	1,458
Securities held-to-maturity	0	0
Other securities	6,050	5,907
Net loans	0	0
Accrued interest receivable	13,657	12,424
Derivative assets	0	0
Liabilities:
Deposits	2,661,094	2,622,905
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	753,344	721,535
Securities held-to-maturity	56,085	60,706
Other securities	20,132	22,903
Net loans	0	0
Accrued interest receivable	0	0
Derivative assets	13,582	17,100
Liabilities:
Deposits	1,396,682	1,362,629
Short-term debt	194,683	261,911
Long-term debt	4,115	4,115
Derivative liabilities	13,482	16,905
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	3,513,838	3,516,557
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