Investment Securities (Available-for-sale Securities by Maturities) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	$ 1,233
Debt securities, maturing 1 to 5 years, amortized cost	29,466
Debt securities, maturing 5 to 10 years, amortized cost	99,451
Available-for-sale securities, maturing over 10 years, amortized cost	653,588
Amortized Cost	785,544	$ 780,304
Debt securities, maturing within 1 year, fair value	1,246
Debt securities, maturing 1 to 5 years, fair value	29,965
Debt securities, maturing 5 to 10 years, fair value	101,865
Available-for-sale securities, maturing over 10 years, fair value	662,518
Fair Value	$ 802,194	784,701
Available-for-sale securities, maturing within 1 year, average yield	1.96%
Available-for-sale securities, maturing 1 to 5 years, average yield	3.12%
Available-for-sale securities, maturing 5 to 10 years, average yield	3.34%
Available-for-sale securities, maturing over 10 years, average yield	2.74%
Available-for-sale securities, total average yield	2.83%
U.S. government sponsored agencies
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	$ 993
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	951
Debt securities, total amortized cost	1,944
Amortized Cost	1,944	2,908
Debt securities, maturing within 1 year, fair value	1,000
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	1,004
Debt securities, total fair value	2,004
Fair Value	2,004	2,966
States and political subdivisions
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	239
Debt securities, maturing 1 to 5 years, amortized cost	12,322
Debt securities, maturing 5 to 10 years, amortized cost	30,930
Debt securities, maturing over 10 years, amortized cost	66,648
Debt securities, total amortized cost	110,139
Amortized Cost	110,139	111,283
Debt securities, maturing within 1 year, fair value	245
Debt securities, maturing 1 to 5 years, fair value	12,728
Debt securities, maturing 5 to 10 years, fair value	31,981
Debt securities, maturing over 10 years, fair value	69,374
Debt securities, total fair value	114,328
Fair Value	114,328	114,726
Residential mortgage-backed securities
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	1
Debt securities, maturing 1 to 5 years, amortized cost	13,866
Debt securities, maturing 5 to 10 years, amortized cost	51,865
Debt securities, maturing over 10 years, amortized cost	577,103
Debt securities, total amortized cost	642,835
Amortized Cost	642,835	635,504
Debt securities, maturing within 1 year, fair value	1
Debt securities, maturing 1 to 5 years, fair value	13,837
Debt securities, maturing 5 to 10 years, fair value	52,809
Debt securities, maturing over 10 years, fair value	584,027
Debt securities, total fair value	650,674
Fair Value	650,674	632,293
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	3,278
Debt securities, maturing 5 to 10 years, amortized cost	16,656
Debt securities, maturing over 10 years, amortized cost	3,734
Debt securities, total amortized cost	23,668
Amortized Cost	23,668	23,770
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	3,400
Debt securities, maturing 5 to 10 years, fair value	17,075
Debt securities, maturing over 10 years, fair value	3,783
Debt securities, total fair value	24,258
Fair Value	24,258	23,845
Bank-issued trust preferred securities
Schedule of Available-for-sale Securities
Other securities, maturing over 10 years, amortized cost	5,152
Other securities, total amortized cost	5,152
Amortized Cost	5,152	5,146
Other securities, maturing over 10 years, fair value	4,330
Other securities, total fair value	4,330
Fair Value	4,330	4,635
Equity securities
Schedule of Available-for-sale Securities
Other securities, total amortized cost	1,806
Amortized Cost	1,806	1,693
Other securities, total fair value	6,600
Fair Value	$ 6,600	$ 6,236

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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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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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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