Investment Securities - Held-to-Maturity and Available-for-Sale, Scheduled Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Held-to-maturity Securities [Abstract]
Securities Held-to-Maturity, Amortized Cost	$ 43,717	$ 24,881
Securities Held-to-Maturity, Gross Unrealized Gains	51	2
Securities Held-to-Maturity, Gross Unrealized Losses	(31)	(12)
Securities Held-to-Maturity, Fair Value	43,737	24,871
Available-for-sale Securities [Abstract]
Securities Available-for-Sale, Amortized Cost	430,248	451,311
Securities Available-for-Sale, Gross Unrealized Gain	2,117	1,777
Securities Available-for-Sale, Gross Unrealized Loss	(6,775)	(9,451)
Securities Available-for-Sale, Fair Value	425,590	443,637
U.S. Government Corporations and Agencies [Member]
Available-for-sale Securities [Abstract]
Securities Available-for-Sale, Amortized Cost, Within 1 year	11,498	15,000
Securities Available-for-Sale, Gross Unrealized Gains, Within 1 year	1	20
Securities Available-for-Sale, Gross Unrealized Losses, Within 1 year	(4)	0
Securities Available-for-Sale, Fair Value, Within 1 year	11,495	15,020
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	15,679	17,265
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	(27)	(19)
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	15,652	17,246
Securities Available-for-Sale, Amortized Cost	27,177	32,265
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	1	20
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(31)	(19)
Securities Available-for-Sale, Debt Securities, Fair Value	27,147	32,266
State and Political Subdivisions [Member]
Available-for-sale Securities [Abstract]
Securities Available-for-Sale, Amortized Cost, Within 1 year	1,560	964
Securities Available-for-Sale, Gross Unrealized Gains, Within 1 year	0	0
Securities Available-for-Sale, Gross Unrealized Losses, Within 1 year	0	(1)
Securities Available-for-Sale, Fair Value, Within 1 year	1,560	963
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	18,115	18,705
Securities Available-for-Sale, Gross Unrealized Gains, After 1 year to 5 years	63	38
Securities Available-for-Sale, Gross Unrealized Losses, After 1 year to 5 years	(23)	(75)
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	18,155	18,668
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	52,312	55,541
Securities Available-for-Sale, Gross Unrealized Gains, After 5 years to 10 years	1,076	829
Securities Available-for-Sale, Gross Unrealized Losses, After 5 years to 10 years	(39)	(426)
Securities Available-for-Sale, Fair Value, After 5 years to 10 years	53,349	55,944
Securities Available-for-Sale, Amortized Cost, Over 10 years	8,533	12,663
Securities Available-for-Sale, Gross Unrealized Gains, Over 10 years	201	226
Securities Available-for-Sale, Gross Unrealized Losses, Over 10 years	(20)	(114)
Securities Available-for-Sale, Fair Value, Over 10 years	8,714	12,775
Securities Available-for-Sale, Amortized Cost	80,520	87,873
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	1,340	1,093
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(82)	(616)
Securities Available-for-Sale, Debt Securities, Fair Value	81,778	88,350
Residential Mortgage Backed Securities [Member]
Available-for-sale Securities [Abstract]
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	5,214	6,086
Securities Available-for-Sale, Gross Unrealized Gains, After 1 year to 5 years	14	0
Securities Available-for-Sale, Gross Unrealized Losses, After 1 year to 5 years	(15)	(66)
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	5,213	6,020
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	51,520	23,479
Securities Available-for-Sale, Gross Unrealized Gains, After 5 years to 10 years	6	0
Securities Available-for-Sale, Gross Unrealized Losses, After 5 years to 10 years	(774)	(622)
Securities Available-for-Sale, Fair Value, After 5 years to 10 years	50,752	22,857
Securities Available-for-Sale, Amortized Cost, Over 10 years	129,141	174,388
Securities Available-for-Sale, Gross Unrealized Gains, Over 10 years	108	99
Securities Available-for-Sale, Gross Unrealized Losses, Over 10 years	(2,253)	(4,794)
Securities Available-for-Sale, Fair Value, Over 10 years	126,996	169,693
Securities Available-for-Sale, Amortized Cost	185,875	203,953
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	128	99
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(3,042)	(5,482)
Securities Available-for-Sale, Debt Securities, Fair Value	182,961	198,570
Collateralized Mortgage Obligations [Member]
Available-for-sale Securities [Abstract]
Securities Available-for-Sale, Amortized Cost, Over 10 years	4,123	4,659
Securities Available-for-Sale, Gross Unrealized Gains, Over 10 years	0	0
Securities Available-for-Sale, Gross Unrealized Losses, Over 10 years	(62)	(105)
Securities Available-for-Sale, Fair Value, Over 10 years	4,061	4,554
Securities Available-for-Sale, Amortized Cost	4,123	4,659
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	0	0
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(62)	(105)
Securities Available-for-Sale, Debt Securities, Fair Value	4,061	4,554
Corporate Bonds [Member]
Available-for-sale Securities [Abstract]
Securities Available-for-Sale, Amortized Cost, Within 1 year	9,027	250
Securities Available-for-Sale, Gross Unrealized Gains, Within 1 year	0	0
Securities Available-for-Sale, Gross Unrealized Losses, Within 1 year	(14)	0
Securities Available-for-Sale, Fair Value, Within 1 year	9,013	250
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	32,402	35,923
Securities Available-for-Sale, Gross Unrealized Gains, After 1 year to 5 years	79	34
Securities Available-for-Sale, Gross Unrealized Losses, After 1 year to 5 years	(94)	(241)
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	32,387	35,716
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	15,182	15,193
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	(223)	(516)
Securities Available-for-Sale, Fair Value, After 5 years to 10 years	14,959	14,677
Securities Available-for-Sale, Amortized Cost, Over 10 years	60,000	60,000
Securities Available-for-Sale, Gross Unrealized Gains, Over 10 years	0	27
Securities Available-for-Sale, Gross Unrealized Losses, Over 10 years	(3,226)	(2,472)
Securities Available-for-Sale, Fair Value, Over 10 years	56,774	57,555
Securities Available-for-Sale, Amortized Cost	116,611	111,366
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	79	61
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(3,557)	(3,229)
Securities Available-for-Sale, Debt Securities, Fair Value	113,133	108,198
Money Market Mutual Funds [Member]
Available-for-sale Securities [Abstract]
Securities Available-for-Sale, Amortized Cost	15,532	10,784
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	15,532	10,784
Equity Securities [Member]
Available-for-sale Securities [Abstract]
Equity Securities Available-for-Sale, Amortized Cost	410	411
Equity Securities Available-for-Sale, Gross Unrealized Gains	569	504
Equity Securities Available-for-Sale, Gross Unrealized Loss	(1)	0
Equity Securities Available-for-Sale, Fair Value	978	915
U.S. Government Corporations and Agencies [Member]
Held-to-maturity Securities [Abstract]
Securities Held-to-Maturity, Amortized Cost, After 1 year to 5 years	5,000	0
Securities Held-to-Maturity, Gross Unrealized Gains, After 1 year to 5 years	1	0
Securities Held-to-Maturity, Gross Unrealized Losses, After 1 year to 5 years	0	0
Securities Held-to-Maturity, Fair Value, After 1 year to 5 years	5,001	0
Securities Held-to-Maturity, Amortized Cost	5,000	0
Securities Held-to-Maturity, Gross Unrealized Gains	1	0
Securities Held-to-Maturity, Gross Unrealized Losses	0	0
Securities Held-to-Maturity, Fair Value	5,001	0
Residential Mortgage Backed Securities [Member]
Held-to-maturity Securities [Abstract]
Securities Held-to-Maturity, Amortized Cost, After 5 years to 10 years	9,849	0
Securities Held-to-Maturity, Gross Unrealized Gains, After 5 years to 10 years	0	0
Securities Held-to-Maturity, Gross Unrecognized Losses, After 5 years to 10 years	(10)	0
Securities Held-to-Maturity, Fair Value, After 5 years to 10 years	9,839	0
Securities Held-to-Maturity, Amortized Cost, Over 10 years	18,868	5,071
Securities Held-to-Maturity, Gross Unrealized Gain, Over 10 years	50	0
Securities Held-to-Maturity, Gross Unrealized Losses, Over 10 years	(19)	(3)
Securities Held-to-Maturity, Fair Value, After 10 Years	18,899	5,068
Securities Held-to-Maturity, Amortized Cost	28,717	5,071
Securities Held-to-Maturity, Gross Unrealized Gains	50	0
Securities Held-to-Maturity, Gross Unrealized Losses	(29)	(3)
Securities Held-to-Maturity, Fair Value	28,738	5,068
Corporate Bonds [Member]
Held-to-maturity Securities [Abstract]
Securities Held-to-Maturity, Amortized Cost, Within 1 year	10,000	19,810
Securities Held-to-Maturity, Gross Unrealized Gains, Within 1 year	0	2
Securities Held-to-Maturity, Gross Unrealized Losses, Within 1 year	(2)	(9)
Securities Held-to-Maturity, Fair Value, Within 1 year	9,998	19,803
Securities Held-to-Maturity, Amortized Cost	10,000	19,810
Securities Held-to-Maturity, Gross Unrealized Gains	0	2
Securities Held-to-Maturity, Gross Unrealized Losses	(2)	(9)
Securities Held-to-Maturity, Fair Value	$ 9,998	$ 19,803