2. Investment securities, Continuous Unrealized Loss Position (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Investment securities with continuous unrealized loss position
Less than 12 Months, Fair Value	$ 9,004	$ 3,999
Less than 12 Months, Unrealized Losses	51	6
12 Months or More, Fair Value	19,910	28,336
12 Months or More, Unrealized Losses	241	426
Total, Fair Value	28,914	32,335
Total, Unrealized Losses	292	432
Mortgage-backed securities
Investment securities with continuous unrealized loss position
Less than 12 Months, Fair Value	127	436
Less than 12 Months, Unrealized Losses	0	1
12 Months or More, Fair Value	2,954	2,963
12 Months or More, Unrealized Losses	7	51
Total, Fair Value	3,081	3,399
Total, Unrealized Losses	7	52
U.S. Government sponsored enterprises
Investment securities with continuous unrealized loss position
Less than 12 Months, Fair Value	2,549	2,996
Less than 12 Months, Unrealized Losses	21	4
12 Months or More, Fair Value	9,639	9,850
12 Months or More, Unrealized Losses	120	132
Total, Fair Value	12,188	12,846
Total, Unrealized Losses	141	136
State and political subdivisions
Investment securities with continuous unrealized loss position
Less than 12 Months, Fair Value	6,328	567
Less than 12 Months, Unrealized Losses	30	1
12 Months or More, Fair Value	6,784	14,998
12 Months or More, Unrealized Losses	108	225
Total, Fair Value	13,112	15,565
Total, Unrealized Losses	138	226
Corporate bonds
Investment securities with continuous unrealized loss position
Less than 12 Months, Fair Value	0	0
Less than 12 Months, Unrealized Losses	0	0
12 Months or More, Fair Value	533	525
12 Months or More, Unrealized Losses	6	18
Total, Fair Value	533	525
Total, Unrealized Losses	$ 6	$ 18