Investment Securities Available for Sale (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	$ 387,640	$ 361,962	$ 424,900
Available-for-Sale	393,133	366,139	429,230
Gross Unrealized Gains	5,735	4,636	5,066
Gross Unrealized Losses	243	459	736
Available-For-Sale Securities, Pledged as Collateral	284,708	267,384	329,039
Maturities of Debt Securities, at Amortized Cost
Within One Year	34,985
From 1 - 5 Years	327,321
From 5 - 10 Years	22,573
Over 10 Years	1,640
Maturities of Debt Securities at Fair Value
Within One Year	35,057
From 1 - 5 Years	332,019
From 5 - 10 Years	23,372
Over 10 Years	1,440
Securities in a Continuous Loss Position, at Fair Value
Less than 12 Months	0	43,022	85,196
12 Months or Longer	26,242	54,339	17,232
Total	26,242	97,361	102,428
Number of Securities in a Continuous Loss Position, in number of securities	106	105	125
Unrealized Losses on Securities in a Continuous Loss Position
Less than 12 Months	0	48	425
12 Months or Longer	243	411	311
Total	243	459	736
U.S. Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Gains	1,049	208	3
Gross Unrealized Losses	22	145	260
Maturities of Debt Securities, at Amortized Cost
Within One Year	5,000
From 1 - 5 Years	145,500
From 5 - 10 Years	0
Over 10 Years	0
Maturities of Debt Securities at Fair Value
Within One Year	5,005
From 1 - 5 Years	146,522
From 5 - 10 Years	0
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value
Less than 12 Months	0	39,631	50,778
12 Months or Longer	13,937	28,020	6,124
Total	13,937	67,651	56,902
Number of Securities in a Continuous Loss Position, in number of securities	46	22	16
Unrealized Losses on Securities in a Continuous Loss Position
Less than 12 Months	0	48	222
12 Months or Longer	22	97	38
Total	22	145	260
U.S. Agency Obligations [Member] | U.S. Government Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	150,500	137,540	121,477
Available-for-Sale	151,527	137,603	121,220
State and Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	73,886	81,582	125,165
Available-for-Sale	74,095	81,730	125,410
Gross Unrealized Gains	217	187	333
Gross Unrealized Losses	9	39	88
Maturities of Debt Securities, at Amortized Cost
Within One Year	23,532
From 1 - 5 Years	48,471
From 5 - 10 Years	1,243
Over 10 Years	640
Maturities of Debt Securities at Fair Value
Within One Year	23,573
From 1 - 5 Years	48,638
From 5 - 10 Years	1,244
Over 10 Years	640
Securities in a Continuous Loss Position, at Fair Value
Less than 12 Months	0	3,309	17,937
12 Months or Longer	6,581	14,035	3,653
Total	6,581	17,344	21,590
Number of Securities in a Continuous Loss Position, in number of securities	7	65	87
Unrealized Losses on Securities in a Continuous Loss Position
Less than 12 Months	0	0	72
12 Months or Longer	9	39	16
Total	9	39	88
Mortgage-Backed Securities - Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	145,185	124,732	160,023
Available-for-Sale	149,510	128,827	164,541
Gross Unrealized Gains	4,325	4,100	4,616
Gross Unrealized Losses	0	5	98
Maturities of Debt Securities, at Amortized Cost
Within One Year	1,515
From 1 - 5 Years	122,340
From 5 - 10 Years	21,330
Over 10 Years	0
Maturities of Debt Securities at Fair Value
Within One Year	1,532
From 1 - 5 Years	125,850
From 5 - 10 Years	22,128
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value
Less than 12 Months	0	82	10,613
12 Months or Longer	22	1,546	4,063
Total	22	1,628	14,676
Number of Securities in a Continuous Loss Position, in number of securities	31	3	9
Unrealized Losses on Securities in a Continuous Loss Position
Less than 12 Months	0	0	81
12 Months or Longer	0	5	17
Total	0	5	98
Mortgage-Backed Securities - Residential [Member] | U.S. Government Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	34,100	23,000	30,600
Available-for-Sale	35,000	23,600	31,300
Mortgage-Backed Securities - Residential [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	111,100	101,700	129,400
Available-for-Sale	114,500	105,200	133,200
Corporate and Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	16,949	16,988	17,115
Available-for-Sale	16,756	16,725	16,839
Gross Unrealized Gains	19	7	14
Gross Unrealized Losses	212	270	290
Maturities of Debt Securities, at Amortized Cost
Within One Year	4,938
From 1 - 5 Years	11,010
From 5 - 10 Years	0
Over 10 Years	1,000
Maturities of Debt Securities at Fair Value
Within One Year	4,947
From 1 - 5 Years	11,009
From 5 - 10 Years	0
Over 10 Years	800
Securities in a Continuous Loss Position, at Fair Value
Less than 12 Months	0	0	5,868
12 Months or Longer	5,702	10,738	3,392
Total	5,702	10,738	9,260
Number of Securities in a Continuous Loss Position, in number of securities	22	15	13
Unrealized Losses on Securities in a Continuous Loss Position
Less than 12 Months	0	0	50
12 Months or Longer	212	270	240
Total	212	270	290
Mutual Funds and Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	1,120	1,120	1,120
Available-for-Sale	1,245	1,254	1,220
Gross Unrealized Gains	125	134	100
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, in number of securities	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