Securities (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Amortized cost and fair value of securities available for sale
Amortized Cost	$ 572,100	$ 513,594
Gross Unrealized Gains	8,670	7,701
Gross Unrealized Losses	(16,492)	(20,041)
Fair Value	564,278	501,254
Trust preferred securities
Amortized cost and fair value of securities available for sale
Amortized Cost	27,514	27,531
Gross Unrealized Gains	290	73
Gross Unrealized Losses	(8,426)	(9,933)
Fair Value	19,378	17,671
Other debt securities
Amortized cost and fair value of securities available for sale
Amortized Cost	18,918	19,544
Gross Unrealized Gains	357	240
Gross Unrealized Losses	(177)	(230)
Fair Value	19,098	19,554
Other equity securities
Amortized cost and fair value of securities available for sale
Amortized Cost	2,775	2,775
Gross Unrealized Gains	1,695	1,542
Gross Unrealized Losses	0	0
Fair Value	4,470	4,317
Obligations of other U.S. Government agencies and corporations
Amortized cost and fair value of securities available for sale
Amortized Cost	6,138	6,144
Gross Unrealized Gains	136	125
Gross Unrealized Losses	(159)	(201)
Fair Value	6,115	6,068
Government agency mortgage backed securities | Residential mortgage backed securities:
Amortized cost and fair value of securities available for sale
Amortized Cost	303,024	261,659
Gross Unrealized Gains	3,254	2,747
Gross Unrealized Losses	(3,296)	(4,414)
Fair Value	302,982	259,992
Government agency mortgage backed securities | Commercial mortgage backed securities:
Amortized cost and fair value of securities available for sale
Amortized Cost	41,063	41,252
Gross Unrealized Gains	1,402	1,373
Gross Unrealized Losses	(406)	(584)
Fair Value	42,059	42,041
Government agency collateralized mortgage obligations | Residential mortgage backed securities:
Amortized cost and fair value of securities available for sale
Amortized Cost	168,484	149,682
Gross Unrealized Gains	1,464	1,542
Gross Unrealized Losses	(4,028)	(4,679)
Fair Value	165,920	146,545
Government agency collateralized mortgage obligations | Commercial mortgage backed securities:
Amortized cost and fair value of securities available for sale
Amortized Cost	4,184	5,007
Gross Unrealized Gains	72	59
Gross Unrealized Losses	0	0
Fair Value	$ 4,256	$ 5,066