Fair Value Measurements (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financial assets:    
Cash and due from banks $ 339,438 $ 231,603
Securities held to maturity 2,425 831
Loans, net 2,357,837 2,233,893
Financial liabilities:    
Junior subordinated debt owed to unconsolidated trusts 55,000 55,000
Carrying Amount | Level 2    
Financial assets:    
Cash and due from banks 339,438 231,603
Securities held to maturity 2,373 834
Loans held for sale 10,400 13,840
Accrued interest receivable 11,187 11,148
Financial liabilities:    
Deposits 2,900,848 2,869,138
Securities sold under agreements to repurchase 198,893 172,348
Long-term debt 50,000  
Junior subordinated debt owed to unconsolidated trusts 55,000 55,000
Accrued interest payable 507 673
Carrying Amount | Level 3    
Financial assets:    
Loans, net 2,357,837 2,233,893
Fair Value | Level 2    
Financial assets:    
Cash and due from banks 339,438 231,603
Securities held to maturity 2,425 831
Loans held for sale 10,634 14,103
Accrued interest receivable 11,187 11,148
Financial liabilities:    
Deposits 2,900,763 2,870,870
Securities sold under agreements to repurchase 198,893 172,348
Long-term debt 50,000  
Junior subordinated debt owed to unconsolidated trusts 55,000 55,000
Accrued interest payable 507 673
Fair Value | Level 3    
Financial assets:    
Loans, net $ 2,360,000 $ 2,236,841