Investment Securities (Available-for-sale Securities by Maturities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	$ 275
Debt securities, maturing 1 to 5 years, amortized cost	19,623
Debt securities, maturing 5 to 10 years, amortized cost	89,994
Available-for-sale securities, maturing over 10 years, amortized cost	637,182
Available-for-sale securities, total amortized cost	748,622	632,967
Debt securities, maturing within 1 year, fair value	280
Debt securities, maturing 1 to 5 years, fair value	20,023
Debt securities, maturing 5 to 10 years, fair value	91,801
Available-for-sale securities, maturing over 10 years, fair value	642,953
Fair Value	760,822us-gaap_AvailableForSaleSecurities	636,880us-gaap_AvailableForSaleSecurities
Available-for-sale securities, maturing within 1 year, average yield	4.61%
Available-for-sale securities, maturing 1 to 5 years, average yield	3.29%
Available-for-sale securities, maturing 5 to 10 years, average yield	2.88%
Available-for-sale securities, maturing over 10 years, average yield	2.74%
Available-for-sale securities, total average yield	2.79%
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	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	0
Available-for-sale securities, total amortized cost	0	1
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	0
Debt securities, maturing over 10 years, fair value	0
Debt securities, total fair value	0
Fair Value	0	1
U.S. government sponsored 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	985
Debt securities, maturing 5 to 10 years, amortized cost	0
Debt securities, maturing over 10 years, amortized cost	4,366
Debt securities, total amortized cost	5,351
Available-for-sale securities, total amortized cost	5,351	5,836
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	999
Debt securities, maturing 5 to 10 years, fair value	0
Debt securities, maturing over 10 years, fair value	4,489
Debt securities, total fair value	5,488
Fair Value	5,488	5,950
States and political subdivisions
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	275
Debt securities, maturing 1 to 5 years, amortized cost	6,432
Debt securities, maturing 5 to 10 years, amortized cost	31,498
Debt securities, maturing over 10 years, amortized cost	76,570
Debt securities, total amortized cost	114,775
Available-for-sale securities, total amortized cost	114,775	62,292
Debt securities, maturing within 1 year, fair value	280
Debt securities, maturing 1 to 5 years, fair value	6,718
Debt securities, maturing 5 to 10 years, fair value	32,558
Debt securities, maturing over 10 years, fair value	78,891
Debt securities, total fair value	118,447
Fair Value	118,447	64,743
Residential 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	12,206
Debt securities, maturing 5 to 10 years, amortized cost	35,513
Debt securities, maturing over 10 years, amortized cost	545,185
Debt securities, total amortized cost	592,904
Available-for-sale securities, total amortized cost	592,904	529,245
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	12,306
Debt securities, maturing 5 to 10 years, fair value	36,046
Debt securities, maturing over 10 years, fair value	548,880
Debt securities, total fair value	597,232
Fair Value	597,232	527,291
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	22,983
Debt securities, maturing over 10 years, amortized cost	4,924
Debt securities, total amortized cost	27,907
Available-for-sale securities, total amortized cost	27,907	28,021
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	23,197
Debt securities, maturing over 10 years, fair value	5,044
Debt securities, total fair value	28,241
Fair Value	28,241	27,847
Bank-issued trust preferred securities
Schedule of Available-for-sale Securities
Other securities, maturing over 10 years, amortized cost	6,137
Other securities, total amortized cost	6,137
Available-for-sale securities, total amortized cost	6,137	6,132
Other securities, maturing over 10 years, fair value	5,649
Other securities, total fair value	5,649
Fair Value	5,649	5,645
Equity securities
Schedule of Available-for-sale Securities
Other securities, total amortized cost	1,548
Available-for-sale securities, total amortized cost	1,548	1,440
Other securities, total fair value	5,765
Fair Value	$ 5,765	$ 5,403

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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Available-for-sale Securities, Other Maturities, Amortized Cost Basis

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

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This item represents the cost of debt 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 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 after the tenth rolling twelve months following the latest balance sheet. 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. For 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 after the tenth rolling twelve months following the latest balance sheet. For 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 sixth through tenth rolling twelve months following the latest balance sheet. 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. For 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 through tenth rolling twelve months following the latest balance sheet. For 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 through fifth rolling twelve months following the latest balance sheet. 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. For 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 through fifth rolling twelve months following the latest balance sheet. For 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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Fair value of available-for-sale debt securities maturing in the next 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 of debt securities categorized neither as held-to-maturity nor trading.

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