Investment Securities (Available-for-sale Securities by Maturities) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Dec. 31, 2013
Investments [Abstract]
Federal income tax rate	35.00%
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	$ 655
Debt securities, maturing 1 to 5 years, amortized cost	11,635
Debt securities, maturing 5 to 10 years, amortized cost	79,033
Available-for-sale securities, maturing over 10 years, amortized cost	505,818
Available-for-sale securities, total amortized cost	598,445	621,126
Debt securities, maturing within 1 year, fair value	668
Debt securities, maturing 1 to 5 years, fair value	12,076
Debt securities, maturing 5 to 10 years, fair value	77,663
Available-for-sale securities, maturing over 10 years, fair value	496,836
Fair Value	592,097	606,108
Available-for-sale securities, maturing within 1 year, average yield	4.14%
Available-for-sale securities, maturing 1 to 5 years, average yield	4.78%
Available-for-sale securities, maturing 5 to 10 years, average yield	2.86%
Available-for-sale securities, maturing over 10 years, average yield	2.74%
Available-for-sale securities, total average yield	2.81%
U.S. Treasury and government agencies
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	0
Debt securities, maturing 1 to 5 years, amortized cost	19
Debt securities, maturing 5 to 10 years, amortized cost	0
Debt securities, maturing over 10 years, amortized cost	0
Debt securities, total amortized cost	19
Available-for-sale securities, total amortized cost	19	20
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	19
Debt securities, maturing 5 to 10 years, fair value	0
Debt securities, maturing over 10 years, fair value	0
Debt securities, total fair value	19
Fair Value	19	20
U.S. government sponsored agencies
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	287
Debt securities, maturing 1 to 5 years, amortized cost	0
Debt securities, maturing 5 to 10 years, amortized cost	0
Debt securities, maturing over 10 years, amortized cost	0
Debt securities, total amortized cost	287
Available-for-sale securities, total amortized cost	287	308
Debt securities, maturing within 1 year, fair value	295
Debt securities, maturing 1 to 5 years, fair value	0
Debt securities, maturing 5 to 10 years, fair value	0
Debt securities, maturing over 10 years, fair value	0
Debt securities, total fair value	295
Fair Value	295	319
States and political subdivisions
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	350
Debt securities, maturing 1 to 5 years, amortized cost	4,232
Debt securities, maturing 5 to 10 years, amortized cost	20,099
Debt securities, maturing over 10 years, amortized cost	25,684
Debt securities, total amortized cost	50,365
Available-for-sale securities, total amortized cost	50,365	50,509
Debt securities, maturing within 1 year, fair value	355
Debt securities, maturing 1 to 5 years, fair value	4,483
Debt securities, maturing 5 to 10 years, fair value	20,703
Debt securities, maturing over 10 years, fair value	26,127
Debt securities, total fair value	51,668
Fair Value	51,668	50,962
Residential mortgage-backed securities
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	18
Debt securities, maturing 1 to 5 years, amortized cost	7,384
Debt securities, maturing 5 to 10 years, amortized cost	35,814
Debt securities, maturing over 10 years, amortized cost	466,856
Debt securities, total amortized cost	510,072
Available-for-sale securities, total amortized cost	510,072	527,283
Debt securities, maturing within 1 year, fair value	18
Debt securities, maturing 1 to 5 years, fair value	7,574
Debt securities, maturing 5 to 10 years, fair value	34,897
Debt securities, maturing over 10 years, fair value	458,027
Debt securities, total fair value	500,516
Fair Value	500,516	510,097
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	0
Debt securities, maturing 1 to 5 years, amortized cost	0
Debt securities, maturing 5 to 10 years, amortized cost	23,120
Debt securities, maturing over 10 years, amortized cost	4,765
Debt securities, total amortized cost	27,885
Available-for-sale securities, total amortized cost	27,885	33,256
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	0
Debt securities, maturing 5 to 10 years, fair value	22,063
Debt securities, maturing over 10 years, fair value	4,687
Debt securities, total fair value	26,750
Fair Value	26,750	32,304
Bank-issued trust preferred securities
Schedule of Available-for-sale Securities
Other securities, maturing over 10 years, amortized cost	8,513
Other securities, total amortized cost	8,513
Available-for-sale securities, total amortized cost	8,513	8,508
Other securities, maturing over 10 years, fair value	7,995
Other securities, total fair value	7,995
Fair Value	7,995	7,829
Equity securities
Schedule of Available-for-sale Securities
Other securities, total amortized cost	1,304
Available-for-sale securities, total amortized cost	1,304	1,242
Other securities, total fair value	4,854
Fair Value	$ 4,854	$ 4,577

Available-for-sale Securities, Average Yield

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Available-for-sale Securities, Maturities, Next Rolling Twelve Months, Average Yield

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Available-for-sale Securities, Maturities, Rolling after Year Ten, Amortized Cost Basis

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Available-for-sale Securities, Maturities, Rolling Year Six Through Ten, Average Yield

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Available-for-sale Securities, Maturities, Rolling Year Two Through Five, Average Yield

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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 of available-for-sale debt securities at cost, net of adjustments, which include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing after the tenth rolling twelve months following the latest balance sheet presented. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at fair value maturing after the tenth rolling twelve months following the latest balance sheet presented.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth rolling twelve months through the tenth rolling twelve months following the latest balance sheet presented. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at fair value maturing in the sixth rolling twelve months through the tenth rolling twelve months following the latest balance sheet presented.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second rolling twelve months through the fifth rolling twelve months following the latest balance sheet presented. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at cost, net of adjustments, 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 any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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