Investment Securities (Summary Of Amortized Cost And Fair Value Of Investment Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Investment [Line Items]
Securities available for sale, Amortized Cost	$ 601,939	$ 543,621
Securities available for sale, Unrealized Gains	17,803	4,599
Securities available for sale, Unrealized Losses	23	3,825
Securities available for sale	619,719	544,395
Securities held to maturity, Amortized Cost	478,549	485,717
Securities held to maturity, Unrealized Gains	12,306	6,628
Securities held to maturity, Unrealized Losses	22	2,281
Securities held to maturity, fair value	490,833	490,064
U.S. Government Agencies And Government Sponsored Enterprises [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	241,583	260,748
Securities available for sale, Unrealized Gains	6,550	1,164
Securities available for sale, Unrealized Losses	7	1,049
Securities available for sale	248,126	260,863
State And Political Subdivisions [Member]
Investment [Line Items]
Securities held to maturity, Amortized Cost	294,507	294,423
Securities held to maturity, Unrealized Gains	10,061	6,562
Securities held to maturity, Unrealized Losses	1	4
Securities held to maturity, fair value	304,567	300,981
Collateralized Mortgage Obligations [Member] \| Federal National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	363	16,998
Securities available for sale, Unrealized Gains		90
Securities available for sale, Unrealized Losses	1	154
Securities available for sale	362	16,934
Securities held to maturity, Amortized Cost	54,246	56,791
Securities held to maturity, Unrealized Gains	525
Securities held to maturity, Unrealized Losses	11	818
Securities held to maturity, fair value	54,760	55,973
Collateralized Mortgage Obligations [Member] \| Federal Home Loan Mortgage Corporation [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	77	5,175
Securities available for sale, Unrealized Gains		1
Securities available for sale, Unrealized Losses	1	91
Securities available for sale	76	5,085
Securities held to maturity, Amortized Cost	76,655	80,570
Securities held to maturity, Unrealized Gains	1,038
Securities held to maturity, Unrealized Losses	2	1,120
Securities held to maturity, fair value	77,691	79,450
Collateralized Mortgage Obligations [Member] \| Government National Mortgage Association [Member]
Investment [Line Items]
Securities held to maturity, Amortized Cost	15,116	19,084
Securities held to maturity, Unrealized Gains	85	19
Securities held to maturity, Unrealized Losses	4	101
Securities held to maturity, fair value	15,197	19,002
Collateralized Mortgage Obligations [Member] \| Privately Issued [Member]
Investment [Line Items]
Securities available for sale, Unrealized Gains	784	809
Securities available for sale	784	809
Mortgage-Backed Securities [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	360,356	282,873
Securities available for sale, Unrealized Gains	11,069	3,217
Securities available for sale, Unrealized Losses	16	2,776
Securities available for sale	371,409	283,314
Securities held to maturity, Amortized Cost	184,042	191,294
Securities held to maturity, Unrealized Gains	2,245	66
Securities held to maturity, Unrealized Losses	21	2,277
Securities held to maturity, fair value	186,266	189,083
Mortgage-Backed Securities [Member] \| Federal National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	311,783	209,671
Securities available for sale, Unrealized Gains	8,776	1,092
Securities available for sale, Unrealized Losses		2,333
Securities available for sale	320,559	208,430
Securities held to maturity, Amortized Cost	12,047	9,242
Securities held to maturity, Unrealized Gains	290	14
Securities held to maturity, Unrealized Losses		79
Securities held to maturity, fair value	12,337	9,177
Mortgage-Backed Securities [Member] \| Federal Home Loan Mortgage Corporation [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	30,743	24,564
Securities available for sale, Unrealized Gains	772	282
Securities available for sale, Unrealized Losses		194
Securities available for sale	31,515	24,652
Mortgage-Backed Securities [Member] \| Government National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	17,390	26,465
Securities available for sale, Unrealized Gains	737	943
Securities available for sale, Unrealized Losses	14	4
Securities available for sale	18,113	27,404
Securities held to maturity, Amortized Cost	25,978	25,607
Securities held to maturity, Unrealized Gains	307	33
Securities held to maturity, Unrealized Losses	4	159
Securities held to maturity, fair value	26,281	25,481
Asset-Backed Securities [Member]
Investment [Line Items]
Securities available for sale, Unrealized Gains	184	218
Securities available for sale	$ 184	$ 218

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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

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

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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