Investment Securities (Schedule Of Investment Securities Classified As Available-for-sale And Held-to-maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Available-for-sale [Abstract]
Total	$ 920,521	$ 945,212
Gross unrealized gains	1,506	14,081
Gross unrealized losses	(14,689)	(5,584)
Investment securities available-for-sale	907,338	953,709
U.S. Government Agency Securities [Member]
Available-for-sale [Abstract]
Total	30,583	36,182
Gross unrealized gains	30	1,167
Gross unrealized losses	(407)	(47)
Investment securities available-for-sale	30,206	37,302
Asset-backed Securities [Member]
Available-for-sale [Abstract]
Total	358,550	360,332
Gross unrealized gains	12	327
Gross unrealized losses	(2,223)	(241)
Investment securities available-for-sale	356,339	360,418
Federally insured student loan securities [Member]
Available-for-sale [Abstract]
Total	21,351	22,518
Gross unrealized gains	3	13
Gross unrealized losses	(92)	(73)
Investment securities available-for-sale	21,262	22,458
Collateralized Loan Obligations Securities [Member]
Available-for-sale [Abstract]
Total	337,199	337,814
Gross unrealized gains	9	314
Gross unrealized losses	(2,131)	(168)
Investment securities available-for-sale	335,077	337,960
Tax-exempt Obligations Of States And Political Subdivisions [Member]
Available-for-sale [Abstract]
Total	3,559	3,559
Gross unrealized gains	28	172
Gross unrealized losses	(4)
Investment securities available-for-sale	3,583	3,731
Taxable Obligations Of States And Political Subdivisions [Member]
Available-for-sale [Abstract]
Total	45,750	45,984
Gross unrealized gains	453	2,422
Investment securities available-for-sale	46,203	48,406
Residential Mortgage-backed Securities [Member]
Available-for-sale [Abstract]
Total	169,062	179,778
Gross unrealized gains	761	4,804
Gross unrealized losses	(2,724)	(281)
Investment securities available-for-sale	167,099	184,301
Collateralized Mortgage Obligation Securities [Member]
Available-for-sale [Abstract]
Total	54,252	60,778
Gross unrealized gains	60	1,083
Gross unrealized losses	(486)
Investment securities available-for-sale	53,826	61,861
Commercial Mortgage-backed Securities [Member]
Available-for-sale [Abstract]
Total	248,765	248,599
Gross unrealized gains	162	4,106
Gross unrealized losses	(5,535)	(1,629)
Investment securities available-for-sale	243,392	251,076
Corporate Debt Securities [Member]
Available-for-sale [Abstract]
Total	10,000	10,000
Gross unrealized losses	(3,310)	(3,386)
Investment securities available-for-sale	$ 6,690	$ 6,614

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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