Securities (Details 6) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Proceeds from sales of securities and the resulting gains and losses
Proceeds	$ 23,414	$ 50,011	$ 26,944
Gross gains	279	720	310
Gross losses	(272)	(670)	(272)
Available-for-sale, Amortized Cost
Due after one through five years		6,296
Due after five through ten years		46,608
Due after ten years		20,889
Asset -backed securities and agency mortgage-backed securities		183,244
Total		257,037
Available-for-sale, Estimated Fair Value
Due after one through five years		6,677
Due after five through ten years		47,191
Due after ten years		21,312
Asset -backed securities and agency mortgage-backed securities		186,309
Estimated Fair Value		261,489		280,100
Held-to-maturity, Amortized Cost
Due after five through ten years		4,398
Due after ten years		75,537
Agency mortgage-backed securities		16,037
Total		95,972		95,921
Held-to-maturity, Estimated Fair Value
Due after five through ten years		4,462
Due after ten years		72,456
Agency mortgage-backed securities		15,923
Estimated Fair Value		$ 92,841		$ 86,032