Securities - Amortized cost and approximate fair values, together with gross unrealized gains and losses (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Available-for-sale Securities:
Amortized Cost	$ 50,767	$ 27,468
Gross Unrealized Gains	315	563
Gross Unrealized Losses	(745)	(27)
Totals Available-for-sale securities	50,337	28,004
U.S. Government sponsored agencies
Available-for-sale Securities:
Amortized Cost	23,544	10,639
Gross Unrealized Gains	33	83
Gross Unrealized Losses	(359)	(13)
Totals Available-for-sale securities	23,218	10,709
Mortgage-backed securities - government sponsored entities
Available-for-sale Securities:
Amortized Cost	10,872	6,989
Gross Unrealized Gains	122	209
Gross Unrealized Losses	(185)
Totals Available-for-sale securities	10,809	7,198
State and political subdivisions
Available-for-sale Securities:
Amortized Cost	16,351	9,840
Gross Unrealized Gains	160	271
Gross Unrealized Losses	(201)	(14)
Totals Available-for-sale securities	$ 16,310	$ 10,097