Investment Securities (Amortized Cost And Fair Value Of Investment Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Investment [Line Items]
Securities available for sale, Amortized Cost	$ 543,508	$ 543,992
Securities available for sale, Unrealized Gains	2,908	2,928
Securities available for sale, Unrealized Losses	6,010	6,994
Securities available for sale	540,406	539,926
Securities held to maturity, Amortized Cost	545,381	543,338
Securities held to maturity, Unrealized Gains	3,853	2,287
Securities held to maturity, Unrealized Losses	4,796	5,634
Securities held to maturity, fair value	544,438	539,991
U.S. Government Agencies And Government Sponsored Enterprises [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	190,793	187,325
Securities available for sale, Unrealized Gains	595	512
Securities available for sale, Unrealized Losses	1,173	1,569
Securities available for sale	190,215	186,268
State And Political Subdivisions [Member]
Investment [Line Items]
Securities held to maturity, Amortized Cost	307,894	305,248
Securities held to maturity, Unrealized Gains	3,723	2,127
Securities held to maturity, Unrealized Losses	892	1,616
Securities held to maturity, fair value	310,725	305,759
Collateralized Mortgage Obligations [Member] \| Federal National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	308	16,921
Securities available for sale, Unrealized Gains		74
Securities available for sale, Unrealized Losses	2	125
Securities available for sale	306	16,870
Securities held to maturity, Amortized Cost	85,474	83,929
Securities held to maturity, Unrealized Gains	21	21
Securities held to maturity, Unrealized Losses	1,433	1,573
Securities held to maturity, fair value	84,062	82,377
Collateralized Mortgage Obligations [Member] \| Federal Home Loan Mortgage Corporation [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	59	5,142
Securities available for sale, Unrealized Losses	1	65
Securities available for sale	58	5,077
Securities held to maturity, Amortized Cost	98,029	101,025
Securities held to maturity, Unrealized Gains	75	80
Securities held to maturity, Unrealized Losses	1,791	1,827
Securities held to maturity, fair value	96,313	99,278
Collateralized Mortgage Obligations [Member] \| Government National Mortgage Association [Member]
Investment [Line Items]
Securities held to maturity, Amortized Cost	13,273	14,909
Securities held to maturity, Unrealized Gains	34	40
Securities held to maturity, Unrealized Losses	149	162
Securities held to maturity, fair value	13,158	14,787
Collateralized Mortgage Obligations [Member] \| Privately Issued [Member]
Investment [Line Items]
Securities available for sale, Unrealized Gains	819	824
Securities available for sale	819	824
Mortgage-Backed Securities [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	352,715	356,667
Securities available for sale, Unrealized Gains	2,080	2,225
Securities available for sale, Unrealized Losses	4,837	5,425
Securities available for sale	349,958	353,467
Securities held to maturity, Amortized Cost	237,487	238,090
Securities held to maturity, Unrealized Gains	130	160
Securities held to maturity, Unrealized Losses	3,904	4,018
Securities held to maturity, fair value	233,713	234,232
Mortgage-Backed Securities [Member] \| Federal National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	303,388	288,949
Securities available for sale, Unrealized Gains	842	897
Securities available for sale, Unrealized Losses	4,008	4,413
Securities available for sale	300,222	285,433
Securities held to maturity, Amortized Cost	10,290	10,362
Securities held to maturity, Unrealized Gains		1
Securities held to maturity, Unrealized Losses	121	124
Securities held to maturity, fair value	10,169	10,239
Mortgage-Backed Securities [Member] \| Federal Home Loan Mortgage Corporation [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	34,362	30,182
Securities available for sale, Unrealized Gains	106	114
Securities available for sale, Unrealized Losses	808	807
Securities available for sale	33,660	29,489
Securities held to maturity, Amortized Cost	3,270	3,290
Securities held to maturity, Unrealized Losses	154	150
Securities held to maturity, fair value	3,116	3,140
Mortgage-Backed Securities [Member] \| Government National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	14,598	15,473
Securities available for sale, Unrealized Gains	313	316
Securities available for sale, Unrealized Losses	18	15
Securities available for sale	14,893	15,774
Securities held to maturity, Amortized Cost	27,151	24,575
Securities held to maturity, Unrealized Gains		18
Securities held to maturity, Unrealized Losses	256	182
Securities held to maturity, fair value	26,895	24,411
Asset-Backed Securities [Member]
Investment [Line Items]
Securities available for sale, Unrealized Gains	233	191
Securities available for sale	$ 233	$ 191

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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-Publisher FASB
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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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Fair value of investments in debt securities classified as held-to-maturity.

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