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Deposits (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Deposits [Line Items]    
Deposits $ 1,269,200 $ 1,129,855
Deposits, weighted average balance 1,147,342 1,106,058
Deposits, weighted average interest rate during the period 0.80% 0.88%
Non-interest-bearing transaction accounts
    
Deposits [Line Items]    
Deposits 165,980 151,275
Deposits, weighted average balance 142,302 138,920
Deposits, weighted average interest rate during the period 0.00% 0.00%
Interest-bearing transaction accounts
    
Deposits [Line Items]    
Deposits 88,478 77,004
Deposits, weighted average balance 81,039 62,578
Deposits, weighted average interest rate during the period 0.23% 0.20%
Money market accounts
    
Deposits [Line Items]    
Deposits 560,965 456,065
Deposits, weighted average balance 465,708 450,558
Deposits, weighted average interest rate during the period 0.51% 0.53%
Certificates of deposit
    
Deposits [Line Items]    
Deposits 43,691 51,979
Deposits, weighted average balance 47,536 60,276
Deposits, weighted average interest rate during the period 0.98% 1.01%
Brokered certificates of deposit
    
Deposits [Line Items]    
Deposits 410,086 393,532
Deposits, weighted average balance $ 410,757 $ 393,726
Deposits, weighted average interest rate during the period 1.51% 1.68%