Investment Securities - Held-to-Maturity and Available-for-Sale, Scheduled Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Held-to-maturity Securities [Abstract]
Securities Held-to-Maturity, Amortized Cost	$ 43,135	$ 54,347
Securities Held-to-Maturity, Gross Unrealized Gains	315	470
Securities Held-to-Maturity, Gross Unrealized Losses	(19)	(52)
Securities Held-to-Maturity, Fair Value	43,431	54,765
Available-for-sale Securities [Abstract]
Securities Available-for-Sale, Amortized Cost	330,613	311,651
Securities Available-for-Sale, Gross Unrealized Gain	3,646	4,160
Securities Available-for-Sale, Gross Unrealized Loss	(2,683)	(1,528)
Securities Available-for-Sale, Fair Value	331,576	314,283
U.S. Treasuries [Member]
Available-for-sale Securities [Abstract]
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	4,975	4,972
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	(79)	(127)
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	4,896	4,845
Securities Available-for-Sale, Amortized Cost	4,975	4,972
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	0	0
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(79)	(127)
Securities Available-for-Sale, Debt Securities, Fair Value	4,896	4,845
U.S. Government Corporations and Agencies [Member]
Available-for-sale Securities [Abstract]
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	115,037	122,328
Securities Available-for-Sale, Gross Unrealized Gains, After 1 year to 5 years	216	48
Securities Available-for-Sale, Gross Unrealized Losses, After 1 year to 5 years	(157)	(532)
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	115,096	121,844
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	4,881	0
Securities Available-for-Sale, Gross Unrealized Gains, After 5 years to 10 years	46	0
Securities Available-for-Sale, Gross Unrealized Losses, After 5 years to 10 years	0	0
Securities Available-for-Sale, Fair Value, After 5 years to 10 years	4,927	0
Securities Available-for-Sale, Amortized Cost	119,918	122,328
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	262	48
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(157)	(532)
Securities Available-for-Sale, Debt Securities, Fair Value	120,023	121,844
State and Political Subdivisions [Member]
Available-for-sale Securities [Abstract]
Securities Available-for-Sale, Amortized Cost, Within 1 year	0	600
Securities Available-for-Sale, Gross Unrealized Gains, Within 1 year	0	2
Securities Available-for-Sale, Gross Unrealized Losses, Within 1 year	0	0
Securities Available-for-Sale, Fair Value, Within 1 year	0	602
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	13,233	12,326
Securities Available-for-Sale, Gross Unrealized Gains, After 1 year to 5 years	62	17
Securities Available-for-Sale, Gross Unrealized Losses, After 1 year to 5 years	(41)	(59)
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	13,254	12,284
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	54,220	49,554
Securities Available-for-Sale, Gross Unrealized Gains, After 5 years to 10 years	1,375	1,616
Securities Available-for-Sale, Gross Unrealized Losses, After 5 years to 10 years	(210)	(77)
Securities Available-for-Sale, Fair Value, After 5 years to 10 years	55,385	51,093
Securities Available-for-Sale, Amortized Cost, Over 10 years	39,984	37,004
Securities Available-for-Sale, Gross Unrealized Gains, Over 10 years	1,264	1,792
Securities Available-for-Sale, Gross Unrealized Losses, Over 10 years	(242)	(1)
Securities Available-for-Sale, Fair Value, Over 10 years	41,006	38,795
Securities Available-for-Sale, Amortized Cost	107,437	99,484
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	2,701	3,427
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(493)	(137)
Securities Available-for-Sale, Debt Securities, Fair Value	109,645	102,774
Residential Mortgage Backed Securities [Member]
Available-for-sale Securities [Abstract]
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	9,820	5,066
Securities Available-for-Sale, Gross Unrealized Gains, After 1 year to 5 years	41	17
Securities Available-for-Sale, Gross Unrealized Losses, After 1 year to 5 years	(4)	0
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	9,857	5,083
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	0	4,856
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	(32)
Securities Available-for-Sale, Fair Value, After 5 years to 10 years	0	4,824
Securities Available-for-Sale, Amortized Cost, Over 10 years	3,619	3,661
Securities Available-for-Sale, Gross Unrealized Gains, Over 10 years	57	75
Securities Available-for-Sale, Gross Unrealized Losses, Over 10 years	0	0
Securities Available-for-Sale, Fair Value, Over 10 years	3,676	3,736
Securities Available-for-Sale, Amortized Cost	13,439	13,583
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	98	92
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(4)	(32)
Securities Available-for-Sale, Debt Securities, Fair Value	13,533	13,643
Collateralized Mortgage Obligations [Member]
Available-for-sale Securities [Abstract]
Securities Available-for-Sale, Amortized Cost, Over 10 years	3,501	3,810
Securities Available-for-Sale, Gross Unrealized Gains, Over 10 years	0	0
Securities Available-for-Sale, Gross Unrealized Losses, Over 10 years	(91)	(85)
Securities Available-for-Sale, Fair Value, Over 10 years	3,410	3,725
Securities Available-for-Sale, Amortized Cost	3,501	3,810
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	0	0
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(91)	(85)
Securities Available-for-Sale, Debt Securities, Fair Value	3,410	3,725
Corporate Bonds [Member]
Available-for-sale Securities [Abstract]
Securities Available-for-Sale, Amortized Cost, Within 1 year	5,000	4,998
Securities Available-for-Sale, Gross Unrealized Gains, Within 1 year	0	22
Securities Available-for-Sale, Gross Unrealized Losses, Within 1 year	0	0
Securities Available-for-Sale, Fair Value, Within 1 year	5,000	5,020
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	19,845	29,505
Securities Available-for-Sale, Gross Unrealized Gains, After 1 year to 5 years	55	88
Securities Available-for-Sale, Gross Unrealized Losses, After 1 year to 5 years	(114)	(244)
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	19,786	29,349
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	10,157	20,442
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	(296)	(371)
Securities Available-for-Sale, Fair Value, After 5 years to 10 years	9,861	20,071
Securities Available-for-Sale, Amortized Cost, Over 10 years	40,000	0
Securities Available-for-Sale, Gross Unrealized Gains, Over 10 years	0	0
Securities Available-for-Sale, Gross Unrealized Losses, Over 10 years	(1,446)	0
Securities Available-for-Sale, Fair Value, Over 10 years	38,554	0
Securities Available-for-Sale, Amortized Cost	75,002	54,945
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	55	110
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(1,856)	(615)
Securities Available-for-Sale, Debt Securities, Fair Value	73,201	54,440
Money Market Mutual Funds [Member]
Available-for-sale Securities [Abstract]
Securities Available-for-Sale, Amortized Cost	5,668	11,675
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	0	0
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	0	0
Securities Available-for-Sale, Debt Securities, Fair Value	5,668	11,675
Equity Securities [Member]
Available-for-sale Securities [Abstract]
Equity Securities Available-for-Sale, Amortized Cost	673	854
Equity Securities Available-for-Sale, Gross Unrealized Gains	530	483
Equity Securities Available-for-Sale, Gross Unrealized Loss	(3)	0
Equity Securities Available-for-Sale, Fair Value	1,200	1,337
Corporate Bonds [Member]
Held-to-maturity Securities [Abstract]
Securities Held-to-Maturity, Amortized Cost, Within 1 year	10,082	13,088
Securities Held-to-Maturity, Gross Unrealized Gains, Within 1 year	79	82
Securities Held-to-Maturity, Gross Unrealized Losses, Within 1 year	0	0
Securities Held-to-Maturity, Fair Value, Within 1 year	10,161	13,170
Securities Held-to-Maturity, Amortized Cost, After 1 year to 5 years	33,053	41,259
Securities Held-to-Maturity, Gross Unrealized Gains, After 1 year to 5 years	236	388
Securities Held-to-Maturity, Gross Unrealized Losses, After 1 year to 5 years	(19)	(52)
Securities Held-to-Maturity, Fair Value, After 1 year to 5 years	33,270	41,595
Securities Held-to-Maturity, Amortized Cost	43,135	54,347
Securities Held-to-Maturity, Gross Unrealized Gains	315	470
Securities Held-to-Maturity, Gross Unrealized Losses	(19)	(52)
Securities Held-to-Maturity, Fair Value	$ 43,431	$ 54,765