Investment Securities (Summary Of Amortized Cost And Fair Value Of Investment Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Investment [Line Items]
Securities available for sale, Amortized Cost	$ 597,656	$ 543,621
Securities available for sale, Unrealized Gains	12,457	4,599
Securities available for sale, Unrealized Losses	100	3,825
Securities available for sale	610,013	544,395
Securities held to maturity, Amortized Cost	476,283	485,717
Securities held to maturity, Unrealized Gains	9,651	6,628
Securities held to maturity, Unrealized Losses	71	2,281
Securities held to maturity, fair value	485,863	490,064
U.S. Government Agencies And Government Sponsored Enterprises [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	235,964	260,748
Securities available for sale, Unrealized Gains	5,506	1,164
Securities available for sale, Unrealized Losses	7	1,049
Securities available for sale	241,463	260,863
State And Political Subdivisions [Member]
Investment [Line Items]
Securities held to maturity, Amortized Cost	291,934	294,423
Securities held to maturity, Unrealized Gains	8,544	6,562
Securities held to maturity, Unrealized Losses	1	4
Securities held to maturity, fair value	300,477	300,981
Collateralized Mortgage Obligations [Member] \| Federal National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	16,986	16,998
Securities available for sale, Unrealized Gains	394	90
Securities available for sale, Unrealized Losses		154
Securities available for sale	17,380	16,934
Securities held to maturity, Amortized Cost	54,281	56,791
Securities held to maturity, Unrealized Gains	227
Securities held to maturity, Unrealized Losses	15	818
Securities held to maturity, fair value	54,493	55,973
Collateralized Mortgage Obligations [Member] \| Federal Home Loan Mortgage Corporation [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	5,165	5,175
Securities available for sale, Unrealized Gains	90	1
Securities available for sale, Unrealized Losses		91
Securities available for sale	5,255	5,085
Securities held to maturity, Amortized Cost	77,407	80,570
Securities held to maturity, Unrealized Gains	467
Securities held to maturity, Unrealized Losses	5	1,120
Securities held to maturity, fair value	77,869	79,450
Collateralized Mortgage Obligations [Member] \| Government National Mortgage Association [Member]
Investment [Line Items]
Securities held to maturity, Amortized Cost	17,106	19,084
Securities held to maturity, Unrealized Gains	57	19
Securities held to maturity, Unrealized Losses	7	101
Securities held to maturity, fair value	17,156	19,002
Collateralized Mortgage Obligations [Member] \| Privately Issued [Member]
Investment [Line Items]
Securities available for sale, Unrealized Gains	777	809
Securities available for sale	777	809
Mortgage-Backed Securities [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	361,692	282,873
Securities available for sale, Unrealized Gains	6,772	3,217
Securities available for sale, Unrealized Losses	93	2,776
Securities available for sale	368,371	283,314
Securities held to maturity, Amortized Cost	184,349	191,294
Securities held to maturity, Unrealized Gains	1,107	66
Securities held to maturity, Unrealized Losses	70	2,277
Securities held to maturity, fair value	185,386	189,083
Mortgage-Backed Securities [Member] \| Federal National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	293,220	209,671
Securities available for sale, Unrealized Gains	4,312	1,092
Securities available for sale, Unrealized Losses	53	2,333
Securities available for sale	297,479	208,430
Securities held to maturity, Amortized Cost	9,190	9,242
Securities held to maturity, Unrealized Gains	152	14
Securities held to maturity, Unrealized Losses	2	79
Securities held to maturity, fair value	9,340	9,177
Mortgage-Backed Securities [Member] \| Federal Home Loan Mortgage Corporation [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	28,019	24,564
Securities available for sale, Unrealized Gains	535	282
Securities available for sale, Unrealized Losses	28	194
Securities available for sale	28,526	24,652
Mortgage-Backed Securities [Member] \| Government National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	18,302	26,465
Securities available for sale, Unrealized Gains	664	943
Securities available for sale, Unrealized Losses	12	4
Securities available for sale	18,954	27,404
Securities held to maturity, Amortized Cost	26,365	25,607
Securities held to maturity, Unrealized Gains	204	33
Securities held to maturity, Unrealized Losses	41	159
Securities held to maturity, fair value	26,528	25,481
Asset-Backed Securities [Member]
Investment [Line Items]
Securities available for sale, Unrealized Gains	179	218
Securities available for sale	$ 179	$ 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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