Investment Securities Schedule of Available for Sale Securities (Details)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	$ 301,876,000	$ 347,615,000
Available-for-Sale	300,200,000	346,996,000
Gross Unrealized Gains	935,000	1,576,000
Gross Unrealized Losses	2,611,000	2,195,000
Available-For-Sale Securities, Pledged as Collateral, at Fair Value	183,052,000	262,852,000
Maturities of Debt Securities, at Amortized Cost:
Within One Year	24,546,000	210,095,000
From 1 - 5 Years	151,060,000	10,186,000
From 5 - 10 Years	75,820,000	220,281,000
Over 10 Years	49,330,000	147
Maturities of Debt Securities, at Fair Value:
Within One Year	24,494,000	1,987,000
From 1 - 5 Years	149,747,000	208,000
From 5 - 10 Years	75,294,000	2,195,000
Over 10 Years	49,104,000
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	99,776,000
12 Months or Longer	121,105,000
Total	$ 220,881,000
Number of Securities in a Continuous Loss Position	106
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 546,000
12 Months or Longer	2,065,000
Total	2,611,000
US Government-sponsored Enterprises Debt Securities [Member] | Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale	186,764,000	163,515,000
U.S. Treasury and Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	60,328,000	147,110,000
Available-for-Sale	59,894,000	147,377,000
Gross Unrealized Gains	0	304,000
Gross Unrealized Losses	434,000	37,000
Maturities of Debt Securities, at Amortized Cost:
Within One Year	13,025,000	70,605,000
From 1 - 5 Years	47,303,000	0
From 5 - 10 Years	0	70,605,000
Over 10 Years	0	19
Maturities of Debt Securities, at Fair Value:
Within One Year	12,956,000	37,000
From 1 - 5 Years	46,938,000	0
From 5 - 10 Years	0	37,000
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	20,348,000
12 Months or Longer	39,546,000
Total	$ 59,894,000
Number of Securities in a Continuous Loss Position	14
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 172,000
12 Months or Longer	262,000
Total	434,000
U.S. Treasury and Agency Obligations [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	0	54,701,000
Available-for-Sale	0	54,706,000
U.S. Treasury and Agency Obligations [Member] | Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	60,328,000	92,409,000
Available-for-Sale	59,894,000	92,671,000
State and Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	10,351,000	27,684,000
Available-for-Sale	10,349,000	27,690,000
Gross Unrealized Gains	9,000	24,000
Gross Unrealized Losses	11,000	18,000
Maturities of Debt Securities, at Amortized Cost:
Within One Year	8,902,000	12,165,000
From 1 - 5 Years	679,000	7,377,000
From 5 - 10 Years	250,000	19,542,000
Over 10 Years	520,000	84
Maturities of Debt Securities, at Fair Value:
Within One Year	8,896,000	13,000
From 1 - 5 Years	683,000	5,000
From 5 - 10 Years	250,000	18,000
Over 10 Years	520,000
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	8,498,000
12 Months or Longer	0
Total	$ 8,498,000
Number of Securities in a Continuous Loss Position	36
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 11,000
12 Months or Longer	0
Total	11,000
Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	229,077,000	168,189,000
Available-for-Sale	227,596,000	167,239,000
Gross Unrealized Gains	485,000	986,000
Gross Unrealized Losses	1,966,000	1,936,000
Maturities of Debt Securities, at Amortized Cost:
Within One Year	2,619,000	126,825,000
From 1 - 5 Years	103,078,000	0
From 5 - 10 Years	75,570,000	126,825,000
Over 10 Years	47,810,000	40
Maturities of Debt Securities, at Fair Value:
Within One Year	2,642,000	1,936,000
From 1 - 5 Years	102,126,000	0
From 5 - 10 Years	75,044,000	1,936,000
Over 10 Years	47,784,000
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	70,930,000
12 Months or Longer	80,759,000
Total	$ 151,689,000
Number of Securities in a Continuous Loss Position	55
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 363,000
12 Months or Longer	1,603,000
Total	1,966,000
Collateralized Mortgage Backed Securities [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	188,245,000	164,495,000
Collateralized Mortgage Backed Securities [Member] | Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	40,832,000	3,694,000
Available-for-Sale	40,832,000	3,724,000
Corporate and Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	1,000,000	3,512,000
Available-for-Sale	800,000	3,308,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	200,000	204,000
Maturities of Debt Securities, at Amortized Cost:
Within One Year	0	500,000
From 1 - 5 Years	0	2,809,000
From 5 - 10 Years	0	3,309,000
Over 10 Years	1,000,000	4
Maturities of Debt Securities, at Fair Value:
Within One Year	0	1,000
From 1 - 5 Years	0	203,000
From 5 - 10 Years	0	204,000
Over 10 Years	800,000
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	0
12 Months or Longer	800,000
Total	$ 800,000
Number of Securities in a Continuous Loss Position	1
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0
12 Months or Longer	200,000
Total	200,000
Mututal Funds and Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	1,120,000	1,120,000
Available-for-Sale	1,561,000	1,382,000
Gross Unrealized Gains	441,000	262,000
Gross Unrealized Losses	0	0
Maturities of Debt Securities, at Amortized Cost:
Within One Year		0
From 1 - 5 Years		0
From 5 - 10 Years		0
Over 10 Years		0
Maturities of Debt Securities, at Fair Value:
Within One Year		0
From 1 - 5 Years		0
From 5 - 10 Years		$ 0
Over 10 Years
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	0
12 Months or Longer	0
Total	$ 0
Number of Securities in a Continuous Loss Position	0
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0
12 Months or Longer	0
Total	$ 0