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Investment Securities (Amortized Cost And Fair Value Of Investment Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investment [Line Items]
Securities available for sale, Amortized Cost	$ 455,582	$ 528,458
Securities available for sale, Unrealized Gains	845	1,681
Securities available for sale, Unrealized Losses	10,750	5,166
Securities available for sale	445,677	524,973
Securities held to maturity, Amortized Cost	446,581	516,466
Securities held to maturity, Unrealized Gains	899	2,341
Securities held to maturity, Unrealized Losses	7,899	5,824
Securities held to maturity, fair value	439,581	512,983
U.S. Government Agencies And Government Sponsored Enterprises [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	155,102	163,025
Securities available for sale, Unrealized Gains		122
Securities available for sale, Unrealized Losses	3,074	1,258
Securities available for sale	152,028	161,889
State And Political Subdivisions [Member]
Investment [Line Items]
Securities held to maturity, Amortized Cost	234,845	283,557
Securities held to maturity, Unrealized Gains	876	2,317
Securities held to maturity, Unrealized Losses	1,211	662
Securities held to maturity, fair value	234,510	285,212
Collateralized Mortgage Obligations [Member] | Federal National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	133	217
Securities available for sale, Unrealized Gains		1
Securities available for sale, Unrealized Losses		1
Securities available for sale	133	217
Securities held to maturity, Amortized Cost	62,103	76,432
Securities held to maturity, Unrealized Gains	1
Securities held to maturity, Unrealized Losses	2,179	1,958
Securities held to maturity, fair value	59,925	74,474
Collateralized Mortgage Obligations [Member] | Federal Home Loan Mortgage Corporation [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	37	45
Securities available for sale	37	45
Securities held to maturity, Amortized Cost	78,200	93,810
Securities held to maturity, Unrealized Gains		3
Securities held to maturity, Unrealized Losses	2,597	2,165
Securities held to maturity, fair value	75,603	91,648
Collateralized Mortgage Obligations [Member] | Government National Mortgage Association [Member]
Investment [Line Items]
Securities held to maturity, Amortized Cost	17,798	22,881
Securities held to maturity, Unrealized Gains		5
Securities held to maturity, Unrealized Losses	535	502
Securities held to maturity, fair value	17,263	22,384
Collateralized Mortgage Obligations [Member] | Privately Issued [Member]
Investment [Line Items]
Securities available for sale, Unrealized Gains	767	976
Securities available for sale	767	976
Mortgage-Backed Securities [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	300,480	365,433
Securities available for sale, Unrealized Gains	845	1,559
Securities available for sale, Unrealized Losses	7,676	3,908
Securities available for sale	293,649	363,084
Securities held to maturity, Amortized Cost	211,736	232,909
Securities held to maturity, Unrealized Gains	23	24
Securities held to maturity, Unrealized Losses	6,688	5,162
Securities held to maturity, fair value	205,071	227,771
Mortgage-Backed Securities [Member] | Federal National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	258,984	311,830
Securities available for sale, Unrealized Gains	44	313
Securities available for sale, Unrealized Losses	6,325	3,220
Securities available for sale	252,703	308,923
Securities held to maturity, Amortized Cost	11,602	9,732
Securities held to maturity, Unrealized Gains	8	16
Securities held to maturity, Unrealized Losses	261	88
Securities held to maturity, fair value	11,349	9,660
Mortgage-Backed Securities [Member] | Federal Home Loan Mortgage Corporation [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	35,962	41,290
Securities available for sale, Unrealized Gains	13	76
Securities available for sale, Unrealized Losses	1,275	675
Securities available for sale	34,700	40,691
Securities held to maturity, Amortized Cost	4,583	3,213
Securities held to maturity, Unrealized Losses	193	119
Securities held to maturity, fair value	4,390	3,094
Mortgage-Backed Securities [Member] | Government National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	5,364	12,051
Securities available for sale, Unrealized Gains	21	193
Securities available for sale, Unrealized Losses	76	12
Securities available for sale	5,309	12,232
Securities held to maturity, Amortized Cost	37,450	26,841
Securities held to maturity, Unrealized Gains	14
Securities held to maturity, Unrealized Losses	923	330
Securities held to maturity, fair value	$ 36,541	$ 26,511

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