Securities (Details 6) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Proceeds from sales of securities and the resulting gains and losses
Proceeds	$ 58,592	$ 108,603	$ 26,944
Gross gains	288	1,008	310
Gross losses	(241)	(911)	(272)
Available-for-sale, Amortized Cost
Due after one through five years	6,315	6,315
Due after five through ten years	29,648	29,648
Due after ten years	15,000	15,000
Asset -backed securities and agency mortgage-backed securities	137,450	137,450
Total	188,413	188,413
Available-for-sale, Estimated Fair Value
Due after one through five years	6,685	6,685
Due after five through ten years	29,731	29,731
Due after ten years	15,487	15,487
Asset -backed securities and agency mortgage-backed securities	139,777	139,777
Estimated Fair Value	191,680	191,680		280,100
Held-to-maturity, Amortized Cost
Due after five through ten years	5,721	5,721
Due after ten years	74,187	74,187
Agency mortgage-backed securities	14,851	14,851
Total	94,759	94,759		95,921
Held-to-maturity, Estimated Fair Value
Due after five through ten years	5,875	5,875
Due after ten years	72,651	72,651
Agency mortgage-backed securities	14,635	14,635
Estimated Fair Value	$ 93,161	$ 93,161		$ 86,032