Investment Securities Available for Sale (Details) $ in Thousands	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2016 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	$ 347,701	$ 347,615	$ 383,206
Available-for-Sale	347,159	346,996	388,247
Gross Unrealized Gains	1,519	1,576	5,263
Gross Unrealized Losses	2,061	2,195	222
Available-For-Sale Securities, Pledged as Collateral	295,797	262,852	328,123
Maturities of Debt Securities, at Amortized Cost:
Within One Year	22,122
From 1 - 5 Years	268,795
From 5 - 10 Years	54,104
Over 10 Years	1,560
Maturities of Debt Securities, at Fair Value:
Within One Year	22,183
From 1 - 5 Years	268,635
From 5 - 10 Years	53,586
Over 10 Years	1,360
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	174,194	210,095	12,369
12 Months or Longer	800	10,186	1,797
Total	$ 174,994	$ 220,281	$ 14,166
Number of Securities in a Continuous Loss Position	61	147	12
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 1,861	$ 1,987	$ 19
12 Months or Longer	200	208	203
Total	2,061	2,195	222
U.S. Agency Obligations
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	147,012	147,110	155,896
Gross Unrealized Gains	270	304	1,750
Gross Unrealized Losses	52	37	0
Maturities of Debt Securities, at Amortized Cost:
Within One Year	0
From 1 - 5 Years	147,012
From 5 - 10 Years	0
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	0
From 1 - 5 Years	147,231
From 5 - 10 Years	0
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	42,937	70,605	0
12 Months or Longer	0	0	0
Total	$ 42,937	$ 70,605	$ 0
Number of Securities in a Continuous Loss Position	11	19	0
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 52	$ 37	$ 0
12 Months or Longer	0	0	0
Total	52	37	0
State and Municipal Obligations
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	25,467	27,684	49,382
Gross Unrealized Gains	40	24	161
Gross Unrealized Losses	0	18	0
Maturities of Debt Securities, at Amortized Cost:
Within One Year	15,395
From 1 - 5 Years	9,071
From 5 - 10 Years	442
Over 10 Years	560
Maturities of Debt Securities, at Fair Value:
Within One Year	15,398
From 1 - 5 Years	9,108
From 5 - 10 Years	441
Over 10 Years	560
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	828	12,165	1,766
12 Months or Longer	0	7,377	0
Total	$ 828	$ 19,542	$ 1,766
Number of Securities in a Continuous Loss Position	5	84	2
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0	$ 13	$ 0
12 Months or Longer	0	5	0
Total	0	18	0
Mortgage-Backed Securities - Residential
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	170,601	168,189	164,905
Gross Unrealized Gains	934	986	3,224
Gross Unrealized Losses	1,806	1,936	19
Maturities of Debt Securities, at Amortized Cost:
Within One Year	4,226
From 1 - 5 Years	112,712
From 5 - 10 Years	53,662
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	4,287
From 1 - 5 Years	112,296
From 5 - 10 Years	53,145
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	127,931	126,825	10,603
12 Months or Longer	0	0	0
Total	$ 127,931	$ 126,825	$ 10,603
Number of Securities in a Continuous Loss Position	41	40	9
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 1,806	$ 1,936	$ 19
12 Months or Longer	0	0	0
Total	1,806	1,936	19
Corporate and Other Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	3,501	3,512	11,903
Gross Unrealized Gains	0	0	15
Gross Unrealized Losses	203	204	203
Maturities of Debt Securities, at Amortized Cost:
Within One Year	2,501
From 1 - 5 Years	0
From 5 - 10 Years	0
Over 10 Years	1,000
Maturities of Debt Securities, at Fair Value:
Within One Year	2,498
From 1 - 5 Years	0
From 5 - 10 Years	0
Over 10 Years	800
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	2,498	500	0
12 Months or Longer	800	2,809	1,797
Total	$ 3,298	$ 3,309	$ 1,797
Number of Securities in a Continuous Loss Position	4	4	1
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 3	$ 1	$ 0
12 Months or Longer	200	203	203
Total	203	204	203
Mutual Funds and Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	1,120	1,120	1,120
Gross Unrealized Gains	275	262	113
Gross Unrealized Losses	0	0	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	0	0	0
12 Months or Longer	0	0	0
Total	$ 0	$ 0	$ 0
Number of Securities in a Continuous Loss Position	0	0	0
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0	$ 0	$ 0
12 Months or Longer	0	0	0
Total	0	0	0
Fair Value, Measurements, Recurring
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale	347,159	346,996	388,247
Fair Value, Measurements, Recurring | U.S. Agency Obligations
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale	147,231	147,377	157,646
Fair Value, Measurements, Recurring | State and Municipal Obligations
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale	25,507	27,690	49,543
Fair Value, Measurements, Recurring | Mortgage-Backed Securities - Residential
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale	169,728	167,239	168,110
Fair Value, Measurements, Recurring | Corporate and Other Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale	3,298	3,308	11,715
Fair Value, Measurements, Recurring | Mutual Funds and Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale	1,395	1,382	1,233
US Treasury Securities | U.S. Agency Obligations
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	54,649	54,701
Available-for-Sale	54,695	54,706
Agency Securities | U.S. Agency Obligations
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	92,363	92,409	155,896
Available-for-Sale	92,536	92,671	157,646
Agency Securities | Mortgage-Backed Securities - Residential
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	1,616	3,694	13,148
Available-for-Sale	1,625	3,724	13,274
US Government-sponsored Enterprises Debt Securities | Mortgage-Backed Securities - Residential
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale	168,103	163,515	154,836
US Government-sponsored Enterprises Debt Securities | Mortgage-Backed Securities - Residential | US Government-sponsored Enterprises Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	$ 168,985	$ 164,495	$ 151,757