Fair Value Measurements (Schedule Of Estimates Of Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets:
Securities available-for-sale	$ 1,340,681	$ 1,178,789
Marketable equity securities	24,548	27,372
Net loans	3,509,400	3,597,570
Accrued interest receivable	15,967	15,793
Liabilities:
Deposits	4,804,546	4,652,216
Carrying Amount
Assets:
Cash and cash equivalents	609,890	528,659
Securities available-for-sale	1,340,681	1,178,789
Marketable equity securities	9,134	11,839
Net loans	3,509,400	3,597,570
Accrued interest receivable	15,967	15,793
Derivative assets	37,138	53,166
Liabilities:
Deposits	4,804,546	4,652,216
Short-term debt	311,316	295,956
Accrued interest payable	815	1,586
Derivative liabilities	34,297	53,288
Fair Value
Assets:
Cash and cash equivalents	609,890	528,659
Securities available-for-sale	1,340,681	1,178,789
Marketable equity securities	9,134	11,839
Net loans	3,447,763	3,578,013
Accrued interest receivable	15,967	15,793
Derivative assets	37,138	53,166
Liabilities:
Deposits	4,809,759	4,665,905
Short-term debt	311,316	295,956
Accrued interest payable	815	1,586
Derivative liabilities	34,297	53,288
Level 1
Assets:
Cash and cash equivalents	609,890	528,659
Securities available-for-sale	0	0
Marketable equity securities	4,019	6,800
Net loans	0	0
Accrued interest receivable	15,967	15,793
Derivative assets	0	0
Liabilities:
Deposits	3,651,155	3,392,194
Short-term debt	0	0
Accrued interest payable	815	1,586
Derivative liabilities	0	0
Level 2
Assets:
Cash and cash equivalents	0	0
Securities available-for-sale	1,332,453	1,169,954
Marketable equity securities	5,115	5,039
Net loans	0	0
Accrued interest receivable	0	0
Derivative assets	37,138	53,166
Liabilities:
Deposits	1,158,604	1,273,711
Short-term debt	311,316	295,956
Accrued interest payable	0	0
Derivative liabilities	34,297	53,288
Level 3
Assets:
Cash and cash equivalents	0	0
Securities available-for-sale	8,228	8,835
Marketable equity securities	0	0
Net loans	3,447,763	3,578,013
Accrued interest receivable	0	0
Derivative assets	0	0
Liabilities:
Deposits	0	0
Short-term debt	0	0
Accrued interest payable	0	0
Derivative liabilities	$ 0	$ 0