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Investment Securities (Summary Of Amortized Cost And Fair Value Of Investment Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Investment [Line Items]
Securities available for sale, Amortized Cost	$ 568,873	$ 619,293
Securities available for sale, Unrealized Gains	9,542	9,016
Securities available for sale, Unrealized Losses	906	5,815
Securities available for sale	577,509	622,494
Securities held to maturity, Amortized Cost	490,638	294,438
Securities held to maturity, Unrealized Gains	6,303	4,377
Securities held to maturity, Unrealized Losses	190	120
Securities held to maturity, fair value	496,751	298,695
U.S. Government Agencies And Government Sponsored Enterprises [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	261,364	160,334
Securities available for sale, Unrealized Gains	2,539	1,116
Securities available for sale, Unrealized Losses	351	975
Securities available for sale	263,552	160,475
State And Political Subdivisions [Member]
Investment [Line Items]
Securities held to maturity, Amortized Cost	289,986	277,273
Securities held to maturity, Unrealized Gains	6,110	4,231
Securities held to maturity, Unrealized Losses	70	120
Securities held to maturity, fair value	296,026	281,384
Mortgage-Backed Securities [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	307,509	458,959
Securities available for sale, Unrealized Gains	6,792	7,669
Securities available for sale, Unrealized Losses	555	4,840
Securities available for sale	313,746	461,788
Securities held to maturity, Amortized Cost	200,652	17,165
Securities held to maturity, Unrealized Gains	193	146
Securities held to maturity, Unrealized Losses	120
Securities held to maturity, fair value	200,725	17,311
Mortgage-Backed Securities [Member] | Federal National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	220,626	184,857
Securities available for sale, Unrealized Gains	3,482	2,344
Securities available for sale, Unrealized Losses	468	1,264
Securities available for sale	223,640	185,937
Securities held to maturity, Amortized Cost	9,293	3,279
Securities held to maturity, Unrealized Gains	81	24
Securities held to maturity, Unrealized Losses	11
Securities held to maturity, fair value	9,363	3,303
Mortgage-Backed Securities [Member] | Federal Home Loan Mortgage Corporation [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	27,371	29,478
Securities available for sale, Unrealized Gains	582	799
Securities available for sale, Unrealized Losses	73	7
Securities available for sale	27,880	30,270
Mortgage-Backed Securities [Member] | Government National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	33,533	48,800
Securities available for sale, Unrealized Gains	1,399	2,022
Securities available for sale, Unrealized Losses	3
Securities available for sale	34,929	50,822
Securities held to maturity, Amortized Cost	26,121	13,886
Securities held to maturity, Unrealized Gains	112	122
Securities held to maturity, Unrealized Losses	109
Securities held to maturity, fair value	26,124	14,008
Collateralized Mortgage Obligations [Member] | Federal National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	20,798	76,247
Securities available for sale, Unrealized Gains	408	489
Securities available for sale, Unrealized Losses	5	944
Securities available for sale	21,201	75,792
Securities held to maturity, Amortized Cost	59,490
Securities held to maturity, fair value	59,490
Collateralized Mortgage Obligations [Member] | Federal Home Loan Mortgage Corporation [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	5,181	89,623
Securities available for sale, Unrealized Gains	1	199
Securities available for sale, Unrealized Losses	6	2,585
Securities available for sale	5,176	87,237
Securities held to maturity, Amortized Cost	84,350
Securities held to maturity, fair value	84,350
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	21,398
Securities held to maturity, fair value	21,398
Collateralized Mortgage Obligations [Member] | Privately Issued [Member]
Investment [Line Items]
Securities available for sale, Unrealized Gains	920	1,218
Securities available for sale	920	1,218
Asset-Backed Securities [Member]
Investment [Line Items]
Securities available for sale, Unrealized Gains	211	231
Securities available for sale	$ 211	$ 231

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