Securities (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Held-to-maturity Securities, Amortized Cost Basis [Abstract]
Due within one year	$ 11,153
Due after one year through five years	52,708
Due after five years through ten years	194,469
Due after ten years	153,745
Held-to-maturity Securities, Fair Value [Abstract]
Due within one year	11,295
Due after one year through five years	54,286
Due after five years through ten years	187,937
Due after ten years	155,058
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Due within one year	0
Due after one year through five years	1,079
Due after five years through ten years	5,065
Due after ten years	27,531
Available-for-sale Securities, Fair Value [Abstract]
Due within one year	0
Due after one year through five years	1,147
Due after five years through ten years	4,921
Due after ten years	17,671
Amortized Cost	412,075	317,766
Fair Value, Held to Maturity	408,576	334,475
Amortized Cost	513,594
Fair Value	501,254	356,311
Other debt securities
Available-for-sale Securities, Fair Value [Abstract]
Amortized Cost	0
Fair Value, Held to Maturity	0
Amortized Cost	19,544
Fair Value	19,554	22,930
Other equity securities
Available-for-sale Securities, Fair Value [Abstract]
Amortized Cost	0
Fair Value, Held to Maturity	0
Amortized Cost	2,775
Fair Value	4,317	3,068
Government agency mortgage backed securities | Residential mortgage backed securities:
Available-for-sale Securities, Fair Value [Abstract]
Amortized Cost	0
Fair Value, Held to Maturity	0
Amortized Cost	261,659
Fair Value	259,992	144,817
Government agency mortgage backed securities | Commercial mortgage backed securities:
Available-for-sale Securities, Fair Value [Abstract]
Amortized Cost	0
Fair Value, Held to Maturity	0
Amortized Cost	41,252
Fair Value	42,041	45,058
Government agency collateralized mortgage obligations | Residential mortgage backed securities:
Available-for-sale Securities, Fair Value [Abstract]
Amortized Cost	0
Fair Value, Held to Maturity	0
Amortized Cost	149,682
Fair Value	146,545	117,521
Government agency collateralized mortgage obligations | Commercial mortgage backed securities:
Available-for-sale Securities, Fair Value [Abstract]
Amortized Cost	0
Fair Value, Held to Maturity	0
Amortized Cost	5,007
Fair Value	$ 5,066	$ 5,407