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Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions - Commitments (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Company's contractual commitments due to letters of credit    
Total letters of credit $ 13,311 $ 11,670
Fixed    
Company's contractual commitments due to letters of credit    
Total letters of credit 305 126
Variable    
Company's contractual commitments due to letters of credit    
Total letters of credit 13,006 11,544
Borrower    
Company's contractual commitments due to letters of credit    
Total letters of credit 12,682 11,095
Borrower | Fixed    
Company's contractual commitments due to letters of credit    
Total letters of credit 210 126
Borrower | Variable    
Company's contractual commitments due to letters of credit    
Total letters of credit 12,472 10,969
Borrower | Financial standby    
Company's contractual commitments due to letters of credit    
Total letters of credit 3,794 3,632
Borrower | Financial standby | Fixed    
Company's contractual commitments due to letters of credit    
Total letters of credit 127 60
Borrower | Financial standby | Variable    
Company's contractual commitments due to letters of credit    
Total letters of credit 3,667 3,572
Borrower | Commercial standby    
Company's contractual commitments due to letters of credit    
Total letters of credit 126 47
Borrower | Commercial standby | Variable    
Company's contractual commitments due to letters of credit    
Total letters of credit 126 47
Borrower | Performance standby    
Company's contractual commitments due to letters of credit    
Total letters of credit 8,762 7,416
Borrower | Performance standby | Fixed    
Company's contractual commitments due to letters of credit    
Total letters of credit 83 66
Borrower | Performance standby | Variable    
Company's contractual commitments due to letters of credit    
Total letters of credit 8,679 7,350
Nonborrower    
Company's contractual commitments due to letters of credit    
Total letters of credit 629 575
Nonborrower | Fixed    
Company's contractual commitments due to letters of credit    
Total letters of credit 95  
Nonborrower | Variable    
Company's contractual commitments due to letters of credit    
Total letters of credit 534 575
Nonborrower | Performance standby    
Company's contractual commitments due to letters of credit    
Total letters of credit 629 575
Nonborrower | Performance standby | Fixed    
Company's contractual commitments due to letters of credit    
Total letters of credit 95  
Nonborrower | Performance standby | Variable    
Company's contractual commitments due to letters of credit    
Total letters of credit $ 534 $ 575