Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financial assets:
Fair Value	$ 381,540	$ 463,931
Derivative instruments	6,222
Financial liabilities:
Derivative instruments	7,393
Mortage loans held for sale [Member]
Financial assets:
Derivative instruments	39,131
Trust preferred securities [Member]
Financial assets:
Fair Value	15,342	12,785
Other debt securities [Member]
Financial assets:
Fair Value	23,664	21,875
Other equity securities [Member]
Financial assets:
Fair Value	3,033	2,237
Obligations of other U.S. Government agencies and corporations [Member]
Financial assets:
Fair Value	2,447	17,395
Government agency mortgage backed securities [Member] | Residential mortgage backed securities [Member]
Financial assets:
Fair Value	174,582	230,667
Government agency mortgage backed securities [Member] | Commercial mortgage backed securities [Member]
Financial assets:
Fair Value	40,095	36,669
Government agency collateralized mortgage obligations [Member] | Residential mortgage backed securities [Member]
Financial assets:
Fair Value	116,926	136,987
Government agency collateralized mortgage obligations [Member] | Commercial mortgage backed securities [Member]
Financial assets:
Fair Value	5,451	5,316
Level 1 [Member] | Mortage loans held for sale [Member]
Financial assets:
Derivative instruments
Level 2 [Member] | Mortage loans held for sale [Member]
Financial assets:
Derivative instruments	39,131
Level 3 [Member] | Mortage loans held for sale [Member]
Financial assets:
Derivative instruments
Recurring [Member]
Financial assets:
Fair Value	381,540	463,931
Derivative instruments	6,222	3,329
Total financial assets	426,893	467,260
Financial liabilities:
Derivative instruments	7,393	2,490
Total financial liabilities	7,393	2,490
Recurring [Member] | Interest rate contracts [Member]
Financial assets:
Derivative instruments	3,360	2,132
Financial liabilities:
Derivative instruments	3,340	2,063
Recurring [Member] | Interest rate lock commitments [Member]
Financial assets:
Derivative instruments	2,862	1,197
Recurring [Member] | Interest rate swap [Member]
Financial liabilities:
Derivative instruments	2,234
Recurring [Member] | Forward commitments [Member]
Financial liabilities:
Derivative instruments	1,819	427
Recurring [Member] | Trust preferred securities [Member]
Financial assets:
Fair Value	15,342	12,785
Recurring [Member] | Other debt securities [Member]
Financial assets:
Fair Value	23,664	21,875
Recurring [Member] | Other equity securities [Member]
Financial assets:
Fair Value	3,033	2,237
Recurring [Member] | Obligations of other U.S. Government agencies and corporations [Member]
Financial assets:
Fair Value	2,447	17,395
Recurring [Member] | Government agency mortgage backed securities [Member] | Residential mortgage backed securities [Member]
Financial assets:
Fair Value	174,582	230,667
Recurring [Member] | Government agency mortgage backed securities [Member] | Commercial mortgage backed securities [Member]
Financial assets:
Fair Value	40,095	36,669
Recurring [Member] | Government agency collateralized mortgage obligations [Member] | Residential mortgage backed securities [Member]
Financial assets:
Fair Value	116,926	136,987
Recurring [Member] | Government agency collateralized mortgage obligations [Member] | Commercial mortgage backed securities [Member]
Financial assets:
Fair Value	5,451	5,316
Recurring [Member] | Level 1 [Member]
Financial assets:
Fair Value
Derivative instruments
Total financial assets
Financial liabilities:
Derivative instruments
Total financial liabilities
Recurring [Member] | Level 1 [Member] | Interest rate contracts [Member]
Financial assets:
Derivative instruments
Financial liabilities:
Derivative instruments
Recurring [Member] | Level 1 [Member] | Interest rate lock commitments [Member]
Financial assets:
Derivative instruments
Recurring [Member] | Level 1 [Member] | Interest rate swap [Member]
Financial liabilities:
Derivative instruments
Recurring [Member] | Level 1 [Member] | Forward commitments [Member]
Financial liabilities:
Derivative instruments
Recurring [Member] | Level 1 [Member] | Trust preferred securities [Member]
Financial assets:
Fair Value
Recurring [Member] | Level 1 [Member] | Other debt securities [Member]
Financial assets:
Fair Value
Recurring [Member] | Level 1 [Member] | Other equity securities [Member]
Financial assets:
Fair Value
Recurring [Member] | Level 1 [Member] | Obligations of other U.S. Government agencies and corporations [Member]
Financial assets:
Fair Value
Recurring [Member] | Level 1 [Member] | Government agency mortgage backed securities [Member] | Residential mortgage backed securities [Member]
Financial assets:
Fair Value
Recurring [Member] | Level 1 [Member] | Government agency mortgage backed securities [Member] | Commercial mortgage backed securities [Member]
Financial assets:
Fair Value
Recurring [Member] | Level 1 [Member] | Government agency collateralized mortgage obligations [Member] | Residential mortgage backed securities [Member]
Financial assets:
Fair Value
Recurring [Member] | Level 1 [Member] | Government agency collateralized mortgage obligations [Member] | Commercial mortgage backed securities [Member]
Financial assets:
Fair Value
Recurring [Member] | Level 2 [Member]
Financial assets:
Fair Value	366,198	448,909
Derivative instruments	6,222	3,329
Total financial assets	411,551	452,238
Financial liabilities:
Derivative instruments	7,393	2,490
Total financial liabilities	7,393	2,490
Recurring [Member] | Level 2 [Member] | Interest rate contracts [Member]
Financial assets:
Derivative instruments	3,360	2,132
Financial liabilities:
Derivative instruments	3,340	2,063
Recurring [Member] | Level 2 [Member] | Interest rate lock commitments [Member]
Financial assets:
Derivative instruments	2,862	1,197
Recurring [Member] | Level 2 [Member] | Interest rate swap [Member]
Financial liabilities:
Derivative instruments	2,234
Recurring [Member] | Level 2 [Member] | Forward commitments [Member]
Financial liabilities:
Derivative instruments	1,819	427
Recurring [Member] | Level 2 [Member] | Trust preferred securities [Member]
Financial assets:
Fair Value
Recurring [Member] | Level 2 [Member] | Other debt securities [Member]
Financial assets:
Fair Value	23,664	21,875
Recurring [Member] | Level 2 [Member] | Other equity securities [Member]
Financial assets:
Fair Value	3,033
Recurring [Member] | Level 2 [Member] | Obligations of other U.S. Government agencies and corporations [Member]
Financial assets:
Fair Value	2,447	17,395
Recurring [Member] | Level 2 [Member] | Government agency mortgage backed securities [Member] | Residential mortgage backed securities [Member]
Financial assets:
Fair Value	174,582	230,667
Recurring [Member] | Level 2 [Member] | Government agency mortgage backed securities [Member] | Commercial mortgage backed securities [Member]
Financial assets:
Fair Value	40,095	36,669
Recurring [Member] | Level 2 [Member] | Government agency collateralized mortgage obligations [Member] | Residential mortgage backed securities [Member]
Financial assets:
Fair Value	116,926	136,987
Recurring [Member] | Level 2 [Member] | Government agency collateralized mortgage obligations [Member] | Commercial mortgage backed securities [Member]
Financial assets:
Fair Value	5,451	5,316
Recurring [Member] | Level 3 [Member]
Financial assets:
Fair Value	15,342	15,022
Derivative instruments
Total financial assets	15,342	15,022
Financial liabilities:
Derivative instruments
Total financial liabilities
Recurring [Member] | Level 3 [Member] | Interest rate contracts [Member]
Financial assets:
Derivative instruments
Financial liabilities:
Derivative instruments
Recurring [Member] | Level 3 [Member] | Interest rate lock commitments [Member]
Financial assets:
Derivative instruments
Recurring [Member] | Level 3 [Member] | Interest rate swap [Member]
Financial liabilities:
Derivative instruments
Recurring [Member] | Level 3 [Member] | Forward commitments [Member]
Financial liabilities:
Derivative instruments
Recurring [Member] | Level 3 [Member] | Trust preferred securities [Member]
Financial assets:
Fair Value	15,342	12,785
Recurring [Member] | Level 3 [Member] | Other debt securities [Member]
Financial assets:
Fair Value
Recurring [Member] | Level 3 [Member] | Other equity securities [Member]
Financial assets:
Fair Value		2,237
Recurring [Member] | Level 3 [Member] | Obligations of other U.S. Government agencies and corporations [Member]
Financial assets:
Fair Value
Recurring [Member] | Level 3 [Member] | Government agency mortgage backed securities [Member] | Residential mortgage backed securities [Member]
Financial assets:
Fair Value
Recurring [Member] | Level 3 [Member] | Government agency mortgage backed securities [Member] | Commercial mortgage backed securities [Member]
Financial assets:
Fair Value
Recurring [Member] | Level 3 [Member] | Government agency collateralized mortgage obligations [Member] | Residential mortgage backed securities [Member]
Financial assets:
Fair Value
Recurring [Member] | Level 3 [Member] | Government agency collateralized mortgage obligations [Member] | Commercial mortgage backed securities [Member]
Financial assets:
Fair Value