Fair Value Measurements (Schedule Of Estimates Of Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Available-for-sale Securities	$ 1,178,789	$ 810,106
Debt Securities, Held-to-maturity, Fair Value		50,598
Marketable Securities	1,206,161	887,632
Carrying Amount
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	528,659	140,144
Available-for-sale Securities	1,178,789	810,106
Debt Securities, Held-to-maturity, Fair Value		49,036
Marketable Securities	11,839	12,634
Loans Receivable, Fair Value Disclosure	3,597,570	3,604,510
Accrued Interest Receivable Fair Value Disclosure	15,793	11,569
Derivative Asset	53,166	19,310
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Deposits, Fair Value Disclosure	4,652,216	4,075,894
Short-term Debt, Fair Value	295,956	211,255
Long-term Debt, Fair Value		4,056
Accrued Interest Payable Fair Value Disclosure	1,586	2,849
Derivative Liability	53,288	19,380
Fair Value
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	528,659	140,144
Available-for-sale Securities	1,178,789	810,106
Debt Securities, Held-to-maturity, Fair Value		50,598
Marketable Securities	11,839	12,634
Loans Receivable, Fair Value Disclosure	3,578,013	3,574,435
Accrued Interest Receivable Fair Value Disclosure	15,793	11,569
Derivative Asset	53,166	19,310
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Deposits, Fair Value Disclosure	4,665,905	4,094,493
Short-term Debt, Fair Value	295,956	211,255
Long-term Debt, Fair Value		4,124
Accrued Interest Payable Fair Value Disclosure	1,586	2,849
Derivative Liability	53,288	19,380
Level 1
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	528,659	140,144
Available-for-sale Securities	0	0
Debt Securities, Held-to-maturity, Fair Value		0
Marketable Securities	6,800	7,787
Loans Receivable, Fair Value Disclosure	0	0
Accrued Interest Receivable Fair Value Disclosure	15,793	11,569
Derivative Asset	0	0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Deposits, Fair Value Disclosure	3,392,194	2,711,323
Short-term Debt, Fair Value	0	0
Long-term Debt, Fair Value		0
Accrued Interest Payable Fair Value Disclosure	1,586	2,849
Derivative Liability	0	0
Level 2
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Available-for-sale Securities	1,169,954	810,106
Debt Securities, Held-to-maturity, Fair Value		50,598
Marketable Securities	5,039	4,847
Loans Receivable, Fair Value Disclosure	0	0
Accrued Interest Receivable Fair Value Disclosure	0	0
Derivative Asset	53,166	19,310
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Deposits, Fair Value Disclosure	1,273,711	1,383,170
Short-term Debt, Fair Value	295,956	211,255
Long-term Debt, Fair Value		4,124
Accrued Interest Payable Fair Value Disclosure	0	0
Derivative Liability	53,288	19,380
Level 3
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Available-for-sale Securities	8,835	0
Debt Securities, Held-to-maturity, Fair Value		0
Marketable Securities	0	0
Loans Receivable, Fair Value Disclosure	3,578,013	3,574,435
Accrued Interest Receivable Fair Value Disclosure	0	0
Derivative Asset	0	0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Deposits, Fair Value Disclosure	0	0
Short-term Debt, Fair Value	0	0
Long-term Debt, Fair Value		0
Accrued Interest Payable Fair Value Disclosure	0	0
Derivative Liability	$ 0	$ 0