Investment Securities (Schedule Of Investment Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 973,923	$ 1,028,883
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	11,005	453
Securities Available-for-Sale, Gross Unrealized Holding Losses	6,103	25,915
Debt Securities, Available-for-sale	978,825	1,003,421
Securities Held-to-Maturity, Amortized Cost	350,375	351,808
Securities Held-to-Maturity, Gross Unrecognized Holding Gains	14,214	3,289
Securities Held-to-Maturity, Gross Unrecognized Holding Losses	29	3,675
Securities held-to-maturity, fair value	364,560	351,422
US Treasury and Government [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,445
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	35
Debt Securities, Available-for-sale	3,480
U.S. Government Sponsored Entities Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	948,287	1,028,883
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	10,597	453
Securities Available-for-Sale, Gross Unrealized Holding Losses	6,100	25,915
Debt Securities, Available-for-sale	952,784	1,003,421
Securities Held-to-Maturity, Amortized Cost	46,264	46,530
Securities Held-to-Maturity, Gross Unrecognized Holding Gains	407	87
Securities Held-to-Maturity, Gross Unrecognized Holding Losses	29	1,003
Securities held-to-maturity, fair value	46,642	45,614
Other Equity Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	6,151
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	160
Debt Securities, Available-for-sale	6,311
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	16,040
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	213
Securities Available-for-Sale, Gross Unrealized Holding Losses	3
Debt Securities, Available-for-sale	16,250
Securities Held-to-Maturity, Amortized Cost	304,111	305,278
Securities Held-to-Maturity, Gross Unrecognized Holding Gains	13,807	3,202
Securities Held-to-Maturity, Gross Unrecognized Holding Losses	0	2,672
Securities held-to-maturity, fair value	$ 317,918	$ 305,808

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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