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Loans (Narrative) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
contract
loan
Jun. 30, 2015
USD ($)
contract
borrower
loan
Dec. 31, 2014
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held-for-sale $ 325 $ 325 $ 0
Purchased credit-impaired (PCI) loans held-for-investment 37,778 37,778 44,816
Investment in non accrual loans 13,800 $ 13,800 13,900
Document Period End Date   Jun. 30, 2015  
Criteria days for delinquent status   90 days  
Impairment of loans 10,300 $ 10,300 10,100
Principal balance of loans on non accrual status 500 500  
Loans on non accrual status with principal balances below threshold definition of an impaired loan 3,900 3,900 3,800
90 Days or More Past Due and Accruing 967 967 708
Loans with carrying balances not written down 12,200 12,200 13,100
Pre-Modification Outstanding Recorded Investment $ 2,764 $ 9,081  
Number of Relationships (contract) | contract 5 8  
Troubled debt restructurings $ 31,800 $ 31,800 $ 33,800
Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of Purchase Credit Impaired Loans   34.00%  
Loan to value ratio (percent) 35.00% 35.00%  
One-to-four family residential mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loan to value ratio (percent) 60.00% 60.00%  
Commercial and industrial loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of Purchase Credit Impaired Loans   49.60%  
Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Pre-Modification Outstanding Recorded Investment   $ 6,300  
Financing Receivable, Pre-Modifications, Number of Contracts | loan 5 5  
Number of Relationships (contract) | loan   1  
Number of Borrowers | borrower   1  
Proceeds from Loans   $ 500