Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2014
ScheduleOfAvailableForSaleSecuritiesLineItems
Available-for-sale securities, Amortized Cost	$ 238,354	$ 235,579
Available-for-sale securities, Gross Unrealized Gains	2,245	1,328
Available-for-sale securities, Gross Unrealized Losses	488	799
Available-for-sale securities, Estimated Fair Value	240,111us-gaap_AvailableForSaleSecurities	236,108us-gaap_AvailableForSaleSecurities
Held-to-maturity securities, Amortized Cost	4,515us-gaap_HeldToMaturitySecurities	4,630us-gaap_HeldToMaturitySecurities
Held-to-maturity securities, Gross Unrealized Gains	154	147
Held-to-maturity securities, Gross Unrealized Losses	53	83
Held-to-maturity securities, Estimated Fair Value	4,616	4,694
US Treasury Securities [Member]
ScheduleOfAvailableForSaleSecuritiesLineItems
Available-for-sale securities, Amortized Cost	5,178	5,210
Available-for-sale securities, Gross Unrealized Gains	14	5
Available-for-sale securities, Gross Unrealized Losses	0	0
Available-for-sale securities, Estimated Fair Value	5,192	5,215
US Government Corporations and Agencies Securities [Member]
ScheduleOfAvailableForSaleSecuritiesLineItems
Available-for-sale securities, Amortized Cost	76,019	75,220
Available-for-sale securities, Gross Unrealized Gains	219	87
Available-for-sale securities, Gross Unrealized Losses	211	347
Available-for-sale securities, Estimated Fair Value	76,027	74,960
Held-to-maturity securities, Amortized Cost	2,677	2,791
Held-to-maturity securities, Gross Unrealized Gains	0	0
Held-to-maturity securities, Gross Unrealized Losses	53	83
Held-to-maturity securities, Estimated Fair Value	2,624	2,708
US States and Political Subdivisions Debt Securities [Member]
ScheduleOfAvailableForSaleSecuritiesLineItems
Held-to-maturity securities, Amortized Cost	1,838	1,839
Held-to-maturity securities, Gross Unrealized Gains	154	147
Held-to-maturity securities, Gross Unrealized Losses	0	0
Held-to-maturity securities, Estimated Fair Value	1,992	1,986
Collateralized Mortgage Backed Securities [Member]
ScheduleOfAvailableForSaleSecuritiesLineItems
Available-for-sale securities, Amortized Cost	156,530	154,525
Available-for-sale securities, Gross Unrealized Gains	2,000	1,230
Available-for-sale securities, Gross Unrealized Losses	277	452
Available-for-sale securities, Estimated Fair Value	158,253	155,303
Equity Securities [Member]
ScheduleOfAvailableForSaleSecuritiesLineItems
Available-for-sale securities, Amortized Cost	627	624
Available-for-sale securities, Gross Unrealized Gains	12	6
Available-for-sale securities, Gross Unrealized Losses	0	0
Available-for-sale securities, Estimated Fair Value	639	630
Held-to-maturity securities, Amortized Cost	0
Held-to-maturity securities, Estimated Fair Value	$ 0

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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