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Investment Securities (Summary Of Amortized Cost And Fair Value Of Investment Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Investment [Line Items]
Securities available for sale, Amortized Cost	$ 543,621	$ 619,293
Securities available for sale, Unrealized Gains	4,599	9,016
Securities available for sale, Unrealized Losses	3,825	5,815
Securities available for sale	544,395	622,494
Securities held to maturity, Amortized Cost	485,717	294,438
Securities held to maturity, Unrealized Gains	6,628	4,377
Securities held to maturity, Unrealized Losses	2,281	120
Securities held to maturity, fair value	490,064	298,695
U.S. Government Agencies And Government Sponsored Enterprises [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	260,748	160,334
Securities available for sale, Unrealized Gains	1,164	1,116
Securities available for sale, Unrealized Losses	1,049	975
Securities available for sale	260,863	160,475
State And Political Subdivisions [Member]
Investment [Line Items]
Securities held to maturity, Amortized Cost	294,423	277,273
Securities held to maturity, Unrealized Gains	6,562	4,231
Securities held to maturity, Unrealized Losses	4	120
Securities held to maturity, fair value	300,981	281,384
Collateralized Mortgage Obligations [Member] | Federal National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	16,998	76,247
Securities available for sale, Unrealized Gains	90	489
Securities available for sale, Unrealized Losses	154	944
Securities available for sale	16,934	75,792
Securities held to maturity, Amortized Cost	56,791
Securities held to maturity, Unrealized Losses	818
Securities held to maturity, fair value	55,973
Collateralized Mortgage Obligations [Member] | Federal Home Loan Mortgage Corporation [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	5,175	89,623
Securities available for sale, Unrealized Gains	1	199
Securities available for sale, Unrealized Losses	91	2,585
Securities available for sale	5,085	87,237
Securities held to maturity, Amortized Cost	80,570
Securities held to maturity, Unrealized Losses	1,120
Securities held to maturity, fair value	79,450
Collateralized Mortgage Obligations [Member] | Government National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost		29,954
Securities available for sale, Unrealized Gains		598
Securities available for sale, Unrealized Losses		40
Securities available for sale		30,512
Securities held to maturity, Amortized Cost	19,084
Securities held to maturity, Unrealized Gains	19
Securities held to maturity, Unrealized Losses	101
Securities held to maturity, fair value	19,002
Collateralized Mortgage Obligations [Member] | Privately Issued [Member]
Investment [Line Items]
Securities available for sale, Unrealized Gains	809	1,218
Securities available for sale	809	1,218
Mortgage-Backed Securities [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	282,873	458,959
Securities available for sale, Unrealized Gains	3,217	7,669
Securities available for sale, Unrealized Losses	2,776	4,840
Securities available for sale	283,314	461,788
Securities held to maturity, Amortized Cost	191,294	17,165
Securities held to maturity, Unrealized Gains	66	146
Securities held to maturity, Unrealized Losses	2,277
Securities held to maturity, fair value	189,083	17,311
Mortgage-Backed Securities [Member] | Federal National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	209,671	184,857
Securities available for sale, Unrealized Gains	1,092	2,344
Securities available for sale, Unrealized Losses	2,333	1,264
Securities available for sale	208,430	185,937
Securities held to maturity, Amortized Cost	9,242	3,279
Securities held to maturity, Unrealized Gains	14	24
Securities held to maturity, Unrealized Losses	79
Securities held to maturity, fair value	9,177	3,303
Mortgage-Backed Securities [Member] | Federal Home Loan Mortgage Corporation [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	24,564	29,478
Securities available for sale, Unrealized Gains	282	799
Securities available for sale, Unrealized Losses	194	7
Securities available for sale	24,652	30,270
Mortgage-Backed Securities [Member] | Government National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	26,465	48,800
Securities available for sale, Unrealized Gains	943	2,022
Securities available for sale, Unrealized Losses	4
Securities available for sale	27,404	50,822
Securities held to maturity, Amortized Cost	25,607	13,886
Securities held to maturity, Unrealized Gains	33	122
Securities held to maturity, Unrealized Losses	159
Securities held to maturity, fair value	25,481	14,008
Asset-Backed Securities [Member]
Investment [Line Items]
Securities available for sale, Unrealized Gains	218	231
Securities available for sale	$ 218	$ 231

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

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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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