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Investment Securities (Schedule Of Investment Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 1,800,956	$ 1,727,363
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	7,882	36,291
Securities Available-for-Sale, Gross Unrealized Holding Losses	51,691	9,514
Debt Securities, Available-for-sale	1,757,147	1,754,140
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	374,101	366,933
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	6,572	22,682
Securities Available-for-Sale, Gross Unrealized Holding Losses	9,032	24
Debt Securities, Available-for-sale	371,641	389,591
U.S. Government Sponsored Entities Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	870,576	849,114
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,185	13,437
Securities Available-for-Sale, Gross Unrealized Holding Losses	36,959	8,088
Debt Securities, Available-for-sale	834,802	854,463
Corporate Debt Securities
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	17,250	11,250
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	125	169
Securities Available-for-Sale, Gross Unrealized Holding Losses	150	7
Debt Securities, Available-for-sale	17,225	11,412
Collateralized Loan Obligations
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	500,029	500,066
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		3
Securities Available-for-Sale, Gross Unrealized Holding Losses	5,112	1,395
Debt Securities, Available-for-sale	494,917	$ 498,674
US Government Corporations and Agencies Securities
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	39,000
Securities Available-for-Sale, Gross Unrealized Holding Losses	438
Debt Securities, Available-for-sale	$ 38,562

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- Definition

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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