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Investments (Investments Classified by Contractual Maturity Date) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Contractual Maturity [Line Items]
Maturing within one year, Amortized Cost	$ 6,164	$ 3,657
Maturing after one year through five years, Amortized Cost	250,424	242,719
Maturing after five years through ten years, Amortized Cost	47,068	50,144
Maturing after ten years, Amortized Cost	47,348	50,413
Amortized Cost, Total	519,744	503,152
Maturing within one year, Fair Value	6,370	3,706
Maturing after one year through five years, Fair Value	253,919	244,733
Maturing after five years through ten years, Fair Value	48,674	51,308
Maturing after ten years, Fair Value	49,287	51,671
Fair Value, Total	528,539	507,582
Other securities [Member]
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Contractual Maturity [Line Items]
Investment securities not due at a single maturity date, Amortized Cost	500	575
Investment securities not due at a single maturity date, Fair Value	1,127	1,296
U.S Government agencies collateralized by mortgage obligations [Member]
Amortized Cost And Estimated Fair Value Of Investment Securities Available For Sale By Contractual Maturity [Line Items]
Investment securities not due at a single maturity date, Amortized Cost	168,240	155,644
Investment securities not due at a single maturity date, Fair Value	$ 169,162	$ 154,868

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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 after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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