Fair Value Measurements (Details 3) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Financial assets:
Cash and due from banks	$ 198,668	$ 351,255
Securities held to maturity	844
Loans, net	2,185,141	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	198,668	351,255
Securities held to maturity	838
Loans held for sale	17,500	40,003
Accrued interest receivable	12,371	12,275
Financial liabilities:
Deposits	2,879,852	2,980,292
Securities sold under agreements to repurchase	156,510	139,024
Long-term debt		7,000
Junior subordinated debt owed to unconsolidated trusts	55,000	55,000
Accrued interest payable	742	1,128
Carrying Amount | Level 3 Inputs
Financial assets:
Loans, net	2,185,141	1,985,095
Fair Value | Level 2 Inputs
Financial assets:
Cash and due from banks	198,668	351,255
Securities held to maturity	844
Loans held for sale	17,828	40,971
Accrued interest receivable	12,371	12,275
Financial liabilities:
Deposits	2,882,254	2,987,524
Securities sold under agreements to repurchase	156,510	139,024
Long-term debt		7,120
Junior subordinated debt owed to unconsolidated trusts	55,000	55,000
Accrued interest payable	742	1,128
Fair Value | Level 3 Inputs
Financial assets:
Loans, net	$ 2,189,051	$ 2,006,588