Fair Value Measurements (Schedule Of Estimates Of Fair Value Of Financial Instruments) (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Assets:
Estimated Fair Value	$ 1,456,259,000	$ 1,505,520,000
Marketable equity securities	24,728,000	23,807,000
Net loans	3,871,962,000	3,629,150,000
Accrued interest receivable	18,395,000	18,287,000
Derivative assets	208,000
Liabilities:
Deposits	5,136,765,000	4,869,866,000
Carrying Amount
Assets:
Cash and cash equivalents	302,810,000	200,000,000
Estimated Fair Value	1,456,259,000	1,505,520,000
Marketable equity securities	7,930,000	7,569,000
Net loans	3,871,962,000	3,629,150,000
Accrued interest receivable	18,395,000	18,287,000
Derivative assets	66,820,000	81,838,000
Liabilities:
Deposits	5,136,765,000	4,869,866,000
Short-term debt	293,256,000	290,964,000
Accrued interest payable	1,585,000	953,000
Derivative liabilities	52,159,000	65,056,000
Fair Value
Assets:
Cash and cash equivalents	302,810,000	200,000,000
Estimated Fair Value	1,456,259,000	1,505,520,000
Marketable equity securities	7,930,000	7,569,000
Net loans	3,735,004,000	3,491,318,000
Accrued interest receivable	18,395,000	18,287,000
Derivative assets	66,820,000	81,838,000
Liabilities:
Deposits	5,113,715,000	4,867,883,000
Short-term debt	293,256,000	290,964,000
Accrued interest payable	1,585,000	953,000
Derivative liabilities	52,159,000	65,056,000
Level 1
Assets:
Cash and cash equivalents	302,810,000	200,000,000
Estimated Fair Value	0	0
Marketable equity securities	3,770,000	3,851,000
Net loans	0	0
Accrued interest receivable	18,395,000	18,287,000
Derivative assets	0	0
Liabilities:
Deposits	4,174,530,000	3,981,766,000
Short-term debt	0	0
Accrued interest payable	1,585,000	953,000
Derivative liabilities	0	0
Level 2
Assets:
Cash and cash equivalents	0	0
Estimated Fair Value	1,453,921,000	1,503,061,000
Marketable equity securities	4,160,000	3,718,000
Net loans	0	0
Accrued interest receivable	0	0
Derivative assets	66,820,000	81,838,000
Liabilities:
Deposits	939,185,000	886,117,000
Short-term debt	293,256,000	290,964,000
Accrued interest payable	0	0
Derivative liabilities	52,159,000	65,056,000
Level 3
Assets:
Cash and cash equivalents	0	0
Estimated Fair Value	2,338,000	2,459,000
Marketable equity securities	0	0
Net loans	3,735,004,000	3,491,318,000
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