Investment Securities - Held-to-Maturity and Available-for-Sale, Scheduled Maturities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Held-to-maturity Securities [Abstract]
Securities Held-to-Maturity, Amortized Cost	$ 54,347us-gaap_HeldToMaturitySecurities	$ 66,003us-gaap_HeldToMaturitySecurities
Securities Held-to-Maturity, Gross Unrealized Gains	470	1,114
Securities Held-to-Maturity, Gross Unrealized Losses	(52)	(264)
Securities Held-to-Maturity, Fair Value	54,765	66,853
Available-for-sale Securities [Abstract]
Securities Available-for-Sale, Amortized Cost	311,651	338,546
Securities Available-for-Sale, Gross Unrealized Gains	4,160	2,883
Securities Available-for-Sale, Gross Unrealized Losses	(1,528)	(5,148)
Securities Available-for-Sale, Fair Value	314,283us-gaap_AvailableForSaleSecurities	336,281us-gaap_AvailableForSaleSecurities
U.S. Treasuries [Member]
Available-for-sale Securities [Abstract]
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	4,972	0
Securities Available-for-Sale, Gross Unrealized Gains, After 1 year to 5 years	0	0
Securities Available-for-Sale, Gross Unrealized Losses, After 1 year to 5 years	(127)	0
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	4,845	0
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	0	4,966
Securities Available-for-Sale, Gross Unrealized Gains, After 5 years to 10 years	0	0
Securities Available-for-Sale, Gross Unrealized Losses, After 5 years to 10 years	0	(258)
Securities Available-for-Sale, Fair Value, After 5 years to 10 years	0	4,708
Securities Available-for-Sale, Amortized Cost	4,972	4,966
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Securities Available-for-Sale, Gross Unrealized Losses	(127)	(258)
Securities Available-for-Sale, Fair Value	4,845	4,708
U.S. Government Corporations and Agencies [Member]
Available-for-sale Securities [Abstract]
Securities Available-for-Sale, Amortized Cost, Within 1 year	0	5,999
Securities Available-for-Sale, Gross Unrealized Gains, Within 1 year	0	16
Securities Available-for-Sale, Gross Unrealized Losses, Within 1 year	0	0
Securities Available-for-Sale, Fair Value, Within 1 year	0	6,015
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	122,328	112,989
Securities Available-for-Sale, Gross Unrealized Gains, After 1 year to 5 years	48	114
Securities Available-for-Sale, Gross Unrealized Losses, After 1 year to 5 years	(532)	(1,226)
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	121,844	111,877
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	0	10,816
Securities Available-for-Sale, Gross Unrealized Gains, After 5 years to 10 years	0	0
Securities Available-for-Sale, Gross Unrealized Losses, After 5 years to 10 years	0	(560)
Securities Available-for-Sale, Fair Value, After 5 years to 10 years	0	10,256
Securities Available-for-Sale, Amortized Cost	122,328	129,804
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	48	130
Securities Available-for-Sale, Gross Unrealized Losses	(532)	(1,786)
Securities Available-for-Sale, Fair Value	121,844	128,148
State and Political Subdivisions [Member]
Available-for-sale Securities [Abstract]
Securities Available-for-Sale, Amortized Cost, Within 1 year	600	1,564
Securities Available-for-Sale, Gross Unrealized Gains, Within 1 year	2	13
Securities Available-for-Sale, Gross Unrealized Losses, Within 1 year	0	0
Securities Available-for-Sale, Fair Value, Within 1 year	602	1,577
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	12,326	5,305
Securities Available-for-Sale, Gross Unrealized Gains, After 1 year to 5 years	17	14
Securities Available-for-Sale, Gross Unrealized Losses, After 1 year to 5 years	(59)	(29)
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	12,284	5,290
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	49,554	41,974
Securities Available-for-Sale, Gross Unrealized Gains, After 5 years to 10 years	1,616	710
Securities Available-for-Sale, Gross Unrealized Losses, After 5 years to 10 years	(77)	(698)
Securities Available-for-Sale, Fair Value, After 5 years to 10 years	51,093	41,986
Securities Available-for-Sale, Amortized Cost, Over 10 years	37,004	57,899
Securities Available-for-Sale, Gross Unrealized Gains, Over 10 years	1,792	1,227
Securities Available-for-Sale, Gross Unrealized Losses, Over 10 years	(1)	(322)
Securities Available-for-Sale, Fair Value, Over 10 years	38,795	58,804
Securities Available-for-Sale, Amortized Cost	99,484	106,742
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	3,427	1,964
Securities Available-for-Sale, Gross Unrealized Losses	(137)	(1,049)
Securities Available-for-Sale, Fair Value	102,774	107,657
Residential Mortgage Backed Securities [Member]
Available-for-sale Securities [Abstract]
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	5,066	0
Securities Available-for-Sale, Gross Unrealized Gains, After 1 year to 5 years	17	0
Securities Available-for-Sale, Gross Unrealized Losses, After 1 year to 5 years	0	0
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	5,083	0
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	4,856	10,008
Securities Available-for-Sale, Gross Unrealized Gains, After 5 years to 10 years	0	5
Securities Available-for-Sale, Gross Unrealized Losses, After 5 years to 10 years	(32)	(53)
Securities Available-for-Sale, Fair Value, After 5 years to 10 years	4,824	9,960
Securities Available-for-Sale, Amortized Cost, Over 10 years	3,661	25,721
Securities Available-for-Sale, Gross Unrealized Gains, Over 10 years	75	20
Securities Available-for-Sale, Gross Unrealized Losses, Over 10 years	0	(221)
Securities Available-for-Sale, Fair Value, Over 10 years	3,736	25,520
Securities Available-for-Sale, Amortized Cost	13,583	35,729
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	92	25
Securities Available-for-Sale, Gross Unrealized Losses	(32)	(274)
Securities Available-for-Sale, Fair Value	13,643	35,480
Collateralized Mortgage Obligations [Member]
Available-for-sale Securities [Abstract]
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	0	73
Securities Available-for-Sale, Gross Unrealized Gains, After 1 year to 5 years	0	0
Securities Available-for-Sale, Gross Unrealized Losses, After 1 year to 5 years	0	0
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	0	73
Securities Available-for-Sale, Amortized Cost, Over 10 years	3,810	7,341
Securities Available-for-Sale, Gross Unrealized Gains, Over 10 years	0	40
Securities Available-for-Sale, Gross Unrealized Losses, Over 10 years	(85)	(253)
Securities Available-for-Sale, Fair Value, Over 10 years	3,725	7,128
Securities Available-for-Sale, Amortized Cost	3,810	7,414
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0	40
Securities Available-for-Sale, Gross Unrealized Losses	(85)	(253)
Securities Available-for-Sale, Fair Value	3,725	7,201
Corporate Bonds [Member]
Available-for-sale Securities [Abstract]
Securities Available-for-Sale, Amortized Cost, Within 1 year	4,998	0
Securities Available-for-Sale, Gross Unrealized Gains, Within 1 year	22	0
Securities Available-for-Sale, Gross Unrealized Losses, Within 1 year	0	0
Securities Available-for-Sale, Fair Value, Within 1 year	5,020	0
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	29,505	18,838
Securities Available-for-Sale, Gross Unrealized Gains, After 1 year to 5 years	88	52
Securities Available-for-Sale, Gross Unrealized Losses, After 1 year to 5 years	(244)	(411)
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	29,349	18,479
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	20,442	16,474
Securities Available-for-Sale, Gross Unrealized Gains, After 5 years to 10 years	0	4
Securities Available-for-Sale, Gross Unrealized Losses, After 5 years to 10 years	(371)	(1,117)
Securities Available-for-Sale, Fair Value, After 5 years to 10 years	20,071	15,361
Securities Available-for-Sale, Amortized Cost	54,945	35,312
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	110	56
Securities Available-for-Sale, Gross Unrealized Losses	(615)	(1,528)
Securities Available-for-Sale, Fair Value	54,440	33,840
Money Market Mutual Funds [Member]
Available-for-sale Securities [Abstract]
Securities Available-for-Sale, Amortized Cost	11,675	16,900
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Securities Available-for-Sale, Gross Unrealized Losses	0	0
Securities Available-for-Sale, Fair Value	11,675	16,900
Equity Securities [Member]
Available-for-sale Securities [Abstract]
Equity Securities Available-for-Sale, Amortized Cost, No stated maturity	854	1,679
Equity Securities Available-for-Sale, Gross Unrealized Gains, No stated maturity	483	668
Equity Securities Available-for-Sale, Gross Unrealized Loss, No stated maturity	0	0
Equity Securities Available-for-Sale, Fair Value, No stated maturity	1,337	2,347
Equity Securities Available-for-Sale, Amortized Cost	854	1,679
Equity Securities Available-for-Sale, Gross Unrealized Gains	483	668
Equity Securities Available-for-Sale, Gross Unrealized Loss	0	0
Equity Securities Available-for-Sale, Fair Value	1,337	2,347
Corporate Bonds [Member]
Held-to-maturity Securities [Abstract]
Securities Held-to-Maturity, Amortized Cost, Within 1 year	13,088	11,148
Securities Held-to-Maturity, Gross Unrealized Gains, Within 1 year	82	122
Securities Held-to-Maturity, Gross Unrealized Losses, Within 1 year	0	0
Securities Held-to-Maturity, Fair Value, Within 1 year	13,170	11,270
Securities Held-to-Maturity, Amortized Cost, After 1 year to 5 years	41,259	54,855
Securities Held-to-Maturity, Gross Unrealized Gains, After 1 year to 5 years	388	992
Securities Held-to-Maturity, Gross Unrealized Losses, After 1 year to 5 years	(52)	(264)
Securities Held-to-Maturity, Fair Value, After 1 year to 5 years	41,595	55,583
Securities Held-to-Maturity, Amortized Cost	54,347	66,003
Securities Held-to-Maturity, Gross Unrealized Gains	470	1,114
Securities Held-to-Maturity, Gross Unrealized Losses	(52)	(264)
Securities Held-to-Maturity, Fair Value	$ 54,765	$ 66,853

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

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This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for 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 before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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This item represents the cost of debt and equity 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 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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Fair value of available-for-sale debt securities maturing after 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 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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