Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Allowance for Loan Losses:
Beginning balance	$ 22,133		$ 20,092		$ 21,958		$ 19,241
Provision for loan losses	300	[1]	2,640	[2]	5,275	[3]	8,300	[4]
Loans charged off	(1,512)		(1,875)		(9,633)		(7,841)
Recoveries	1,083		600		4,404		1,757
Ending Balance	22,004		21,457		22,004		21,457
Commercial
Allowance for Loan Losses:
Beginning balance	14,531		13,190		10,987		12,119
Provision for loan losses	(486)	[1]	765	[2]	2,438	[3]	3,642	[4]
Loans charged off	(388)		(715)		(2,273)		(2,917)
Recoveries	361		167		2,866		563
Ending Balance	14,018		13,407		14,018		13,407
Residential
Allowance for Loan Losses:
Beginning balance	1,592		2,124		5,426		2,728
Provision for loan losses	(266)	[1]	1,594	[2]	234	[3]	2,859	[4]
Loans charged off	(284)		(381)		(4,683)		(2,289)
Recoveries	398		36		463		75
Ending Balance	1,440		3,373		1,440		3,373
Consumer
Allowance for Loan Losses:
Beginning balance	3,637		3,744		3,879		3,889
Provision for loan losses	504	[1]	196	[2]	1,348	[3]	1,185	[4]
Loans charged off	(840)		(779)		(2,677)		(2,635)
Recoveries	324		397		1,075		1,119
Ending Balance	3,625		3,558		3,625		3,558
Unallocated
Allowance for Loan Losses:
Beginning balance	2,373		1,034		1,666		505
Provision for loan losses	548	[1]	85	[2]	1,255	[3]	614	[4]
Loans charged off	0		0		0		0
Recoveries	0		0		0		0
Ending Balance	$ 2,921		$ 1,119		$ 2,921		$ 1,119

[1] Provision before increase of $195 thousand in 2013for decrease in FDIC indemnification asset

[2] Provision before decrease of $81 thousand in 2012 for increase in FDIC indemnification asset

[3] Provision before increase of $1.2 million in 2013 for decrease in FDIC indemnification asset

[4] Provision before decrease of $1.0 million in 2012 for increase in FDIC indemnification asset