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Fair Value - Financial Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Financial Assets and Liabilities Measured on a Recurring Basis    
Securities available-for-sale $ 306,589 $ 385,079
Agency mortgage-backed securities    
Financial Assets and Liabilities Measured on a Recurring Basis    
Securities available-for-sale 290,989 324,230
U.S. Treasury    
Financial Assets and Liabilities Measured on a Recurring Basis    
Securities available-for-sale   30,003
Trust preferred securities    
Financial Assets and Liabilities Measured on a Recurring Basis    
Securities available-for-sale 15,600 15,132
U.S. Government sponsored entities    
Financial Assets and Liabilities Measured on a Recurring Basis    
Securities available-for-sale   9,041
Corporate bonds    
Financial Assets and Liabilities Measured on a Recurring Basis    
Securities available-for-sale   6,673
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial Assets and Liabilities Measured on a Recurring Basis    
Securities available-for-sale   30,003
Significant Other Observable Inputs (Level 2)    
Financial Assets and Liabilities Measured on a Recurring Basis    
Securities available-for-sale 306,589 355,076
I/O strip receivables 1,067 1,367
Recurring basis    
Financial Assets and Liabilities Measured on a Recurring Basis    
I/O strip receivables 1,067 1,367
Transfers between Level 1 and Level 2    
Transfers between Level 1 and Level 2 0 0
Transfers between Level 2 and Level 1 0 0
Recurring basis | Agency mortgage-backed securities    
Financial Assets and Liabilities Measured on a Recurring Basis    
Securities available-for-sale 290,989 324,230
Recurring basis | U.S. Treasury    
Financial Assets and Liabilities Measured on a Recurring Basis    
Securities available-for-sale   30,003
Recurring basis | Trust preferred securities    
Financial Assets and Liabilities Measured on a Recurring Basis    
Securities available-for-sale 15,600 15,132
Recurring basis | U.S. Government sponsored entities    
Financial Assets and Liabilities Measured on a Recurring Basis    
Securities available-for-sale   9,041
Recurring basis | Corporate bonds    
Financial Assets and Liabilities Measured on a Recurring Basis    
Securities available-for-sale   6,673
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury    
Financial Assets and Liabilities Measured on a Recurring Basis    
Securities available-for-sale   30,003
Recurring basis | Significant Other Observable Inputs (Level 2)    
Financial Assets and Liabilities Measured on a Recurring Basis    
I/O strip receivables 1,067 1,367
Recurring basis | Significant Other Observable Inputs (Level 2) | Agency mortgage-backed securities    
Financial Assets and Liabilities Measured on a Recurring Basis    
Securities available-for-sale 290,989 324,230
Recurring basis | Significant Other Observable Inputs (Level 2) | Trust preferred securities    
Financial Assets and Liabilities Measured on a Recurring Basis    
Securities available-for-sale $ 15,600 15,132
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Government sponsored entities    
Financial Assets and Liabilities Measured on a Recurring Basis    
Securities available-for-sale   9,041
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate bonds    
Financial Assets and Liabilities Measured on a Recurring Basis    
Securities available-for-sale   $ 6,673