Fair Value Measurements (Details 3) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financial assets:
Cash and due from banks	$ 251,204	$ 351,255
Loans, net	2,069,733	1,985,095
Financial liabilities:
Junior subordinated debt owed to unconsolidated trusts	55,000	55,000
Carrying Amount | Level 2 Inputs
Financial assets:
Cash and due from banks	251,204	351,255
Loans held for sale	40,874	40,003
Accrued interest receivable	12,029	12,275
Financial liabilities:
Deposits	2,870,936	2,980,292
Securities sold under agreements to repurchase	148,238	139,024
Long-term debt		7,000
Junior subordinated debt owed to unconsolidated trusts	55,000	55,000
Accrued interest payable	819	1,128
Carrying Amount | Level 3 Inputs
Financial assets:
Loans, net	2,069,733	1,985,095
Fair Value | Level 2 Inputs
Financial assets:
Cash and due from banks	251,204	351,255
Loans held for sale	41,674	40,971
Accrued interest receivable	12,029	12,275
Financial liabilities:
Deposits	2,874,156	2,987,524
Securities sold under agreements to repurchase	148,238	139,024
Long-term debt		7,120
Junior subordinated debt owed to unconsolidated trusts	55,000	55,000
Accrued interest payable	819	1,128
Fair Value | Level 3 Inputs
Financial assets:
Loans, net	$ 2,071,329	$ 2,006,588