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Investment Securities (Schedule Of Investment Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Investments [Line Items]
Securities available-for-sale, amortized cost	$ 1,079,745	$ 1,097,645
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	880	4,645
Securities Available-for-Sale, Gross Unrealized Holding Losses	33,715	10,409
Securities Available-for-Sale, Total Fair value	1,046,910	1,091,881
Securities Held-to-Maturity, Amortized Cost	347,622	357,197
Securities Held-to-Maturity, Gross Unrecognized Holding Gains	3,109	7,333
Securities Held-to-Maturity, Gross Unrecognized Holding Losses	4,532	751
Securities Held-to-Maturity, Estimated Fair Value	346,199	363,779
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member]
Schedule of Investments [Line Items]
Securities available-for-sale, amortized cost		245,000
Securities Available-for-Sale, Gross Unrealized Holding Losses		2,280
Securities Available-for-Sale, Total Fair value		242,720
U.S. Government Sponsored Entities Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Securities available-for-sale, amortized cost	1,079,745	852,645
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	880	4,645
Securities Available-for-Sale, Gross Unrealized Holding Losses	33,715	8,129
Securities Available-for-Sale, Total Fair value	1,046,910	849,161
Securities Held-to-Maturity, Amortized Cost	47,767	56,785
Securities Held-to-Maturity, Gross Unrecognized Holding Gains	18	758
Securities Held-to-Maturity, Gross Unrecognized Holding Losses	1,246	38
Securities Held-to-Maturity, Estimated Fair Value	46,539	57,505
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Securities Held-to-Maturity, Amortized Cost	299,855	300,412
Securities Held-to-Maturity, Gross Unrecognized Holding Gains	3,091	6,575
Securities Held-to-Maturity, Gross Unrecognized Holding Losses	3,286	713
Securities Held-to-Maturity, Estimated Fair Value	$ 299,660	$ 306,274

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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