Investment Securities (Available-for-sale Securities by Maturities) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	$ 1,008
Debt securities, maturing 1 to 5 years, amortized cost	32,093
Debt securities, maturing 5 to 10 years, amortized cost	67,696
Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Amortized Cost Basis	690,487
Amortized Cost	792,810	$ 777,017
Debt securities, maturing within 1 year, fair value	1,015
Debt securities, maturing 1 to 5 years, fair value	32,211
Debt securities, maturing 5 to 10 years, fair value	68,354
Debt securities, maturing over 10 years, fair value	687,368
Fair Value	$ 797,021	777,940
Available-for-sale securities, maturing within 1 year, average yield	3.48%
Available-for-sale securities, maturing 1 to 5 years, average yield	3.61%
Available-for-sale securities, maturing 5 to 10 years, average yield	3.55%
Available-for-sale securities, maturing over 10 years, average yield	3.36%
Available-for-sale securities, total average yield	3.39%
U.S. government sponsored agencies
Schedule of Available-for-sale Securities
Amortized Cost		1,000
Fair Value		1,000
States and political subdivisions
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	$ 995
Debt securities, maturing 1 to 5 years, amortized cost	11,339
Debt securities, maturing 5 to 10 years, amortized cost	28,293
Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Amortized Cost Basis	61,788
Debt securities, total amortized cost	102,415
Amortized Cost	102,415	115,657
Debt securities, maturing within 1 year, fair value	1,002
Debt securities, maturing 1 to 5 years, fair value	11,451
Debt securities, maturing 5 to 10 years, fair value	28,743
Debt securities, maturing over 10 years, fair value	63,364
Debt securities, total fair value	104,560
Fair Value	104,560	117,230
Residential mortgage-backed securities
Schedule of Available-for-sale Securities
Debt securities, maturing within 1 year, amortized cost	13
Debt securities, maturing 1 to 5 years, amortized cost	15,029
Debt securities, maturing 5 to 10 years, amortized cost	37,213
Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Amortized Cost Basis	624,321
Debt securities, total amortized cost	676,576
Amortized Cost	676,576	633,802
Debt securities, maturing within 1 year, fair value	13
Debt securities, maturing 1 to 5 years, fair value	14,998
Debt securities, maturing 5 to 10 years, fair value	37,274
Debt securities, maturing over 10 years, fair value	619,821
Debt securities, total fair value	672,106
Fair Value	672,106	626,567
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	5,725
Debt securities, maturing 5 to 10 years, amortized cost	0
Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Amortized Cost Basis	1,380
Debt securities, total amortized cost	7,105
Amortized Cost	7,105	19,337
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	5,762
Debt securities, maturing 5 to 10 years, fair value	0
Debt securities, maturing over 10 years, fair value	1,366
Debt securities, total fair value	7,128
Fair Value	7,128	19,291
Bank-issued trust preferred securities
Schedule of Available-for-sale Securities
Debt securities, maturing 5 to 10 years, amortized cost	2,190
Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Amortized Cost Basis	2,998
Amortized Cost	5,188	5,169
Debt securities, maturing 5 to 10 years, fair value	2,337
Debt securities, maturing over 10 years, fair value	2,817
Debt securities, total fair value	5,154
Fair Value	5,154	4,899
Equity securities
Schedule of Available-for-sale Securities
Amortized Cost	1,526	2,052
Debt securities, total fair value	8,073
Fair Value	$ 8,073	$ 8,953

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, Average Yield

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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 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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