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Investment Securities (Amortized Cost And Fair Value Of Investment Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Investment [Line Items]
Securities available for sale, Amortized Cost	$ 430,214	$ 455,582
Securities available for sale, Unrealized Gains	1,146	845
Securities available for sale, Unrealized Losses	3,815	10,750
Securities available for sale	427,545	445,677
Securities held to maturity, Amortized Cost	438,984	446,581
Securities held to maturity, Unrealized Gains	2,419	899
Securities held to maturity, Unrealized Losses	4,429	7,899
Securities held to maturity, fair value	436,974	439,581
U.S. Government Agency And Government Sponsored Enterprises [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	145,072	155,102
Securities available for sale, Unrealized Gains	113
Securities available for sale, Unrealized Losses	809	3,074
Securities available for sale	144,376	152,028
State And Political Subdivisions [Member]
Investment [Line Items]
Securities held to maturity, Amortized Cost	232,160	234,845
Securities held to maturity, Unrealized Gains	2,236	876
Securities held to maturity, Unrealized Losses	225	1,211
Securities held to maturity, fair value	234,171	234,510
Collateralized Mortgage Obligations [Member] | Federal National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	127	133
Securities available for sale, Unrealized Losses	1
Securities available for sale	126	133
Securities held to maturity, Amortized Cost	59,584	62,103
Securities held to maturity, Unrealized Gains	31	1
Securities held to maturity, Unrealized Losses	1,474	2,179
Securities held to maturity, fair value	58,141	59,925
Collateralized Mortgage Obligations [Member] | Federal Home Loan Mortgage Corporation [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	36	37
Securities available for sale	36	37
Securities held to maturity, Amortized Cost	75,029	78,200
Securities held to maturity, Unrealized Gains	6
Securities held to maturity, Unrealized Losses	1,624	2,597
Securities held to maturity, fair value	73,411	75,603
Collateralized Mortgage Obligations [Member] | Government National Mortgage Association [Member]
Investment [Line Items]
Securities held to maturity, Amortized Cost	16,924	17,798
Securities held to maturity, Unrealized Losses	363	535
Securities held to maturity, fair value	16,561	17,263
Collateralized Mortgage Obligations [Member] | Privately Issued [Member]
Investment [Line Items]
Securities available for sale, Unrealized Gains	723	767
Securities available for sale	723	767
Mortgage-Backed Securities [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	285,142	300,480
Securities available for sale, Unrealized Gains	1,033	845
Securities available for sale, Unrealized Losses	3,006	7,676
Securities available for sale	283,169	293,649
Securities held to maturity, Amortized Cost	206,824	211,736
Securities held to maturity, Unrealized Gains	183	23
Securities held to maturity, Unrealized Losses	4,204	6,688
Securities held to maturity, fair value	202,803	205,071
Mortgage-Backed Securities [Member] | Federal National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	240,973	258,984
Securities available for sale, Unrealized Gains	202	44
Securities available for sale, Unrealized Losses	2,366	6,325
Securities available for sale	238,809	252,703
Securities held to maturity, Amortized Cost	11,276	11,602
Securities held to maturity, Unrealized Gains	69	8
Securities held to maturity, Unrealized Losses	114	261
Securities held to maturity, fair value	11,231	11,349
Mortgage-Backed Securities [Member] | Federal Home Loan Mortgage Corporation [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	38,903	35,962
Securities available for sale, Unrealized Gains	86	13
Securities available for sale, Unrealized Losses	634	1,275
Securities available for sale	38,355	34,700
Securities held to maturity, Amortized Cost	4,167	4,583
Securities held to maturity, Unrealized Gains	27
Securities held to maturity, Unrealized Losses	109	193
Securities held to maturity, fair value	4,085	4,390
Mortgage-Backed Securities [Member] | Government National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	5,103	5,364
Securities available for sale, Unrealized Gains	22	21
Securities available for sale, Unrealized Losses	5	76
Securities available for sale	5,120	5,309
Securities held to maturity, Amortized Cost	39,844	37,450
Securities held to maturity, Unrealized Gains	50	14
Securities held to maturity, Unrealized Losses	520	923
Securities held to maturity, fair value	$ 39,374	$ 36,541

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