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Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions - Balance Sheet Risk - Commitments (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Company's contractual commitments due to letters of credit    
Total letters of credit $ 14,403 $ 14,862
Fixed [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 851 859
Variable [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 13,552 14,003
Commitments to Extend Credit to Borrowers [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 14,336 14,795
Commitments to Extend Credit to Borrowers [Member] | Fixed [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 851 859
Commitments to Extend Credit to Borrowers [Member] | Variable [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 13,485 13,936
Commitments to Extend Credit to Borrowers [Member] | Financial Standby Letter of Credit [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 7,156 7,485
Commitments to Extend Credit to Borrowers [Member] | Financial Standby Letter of Credit [Member] | Fixed [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 319 327
Commitments to Extend Credit to Borrowers [Member] | Financial Standby Letter of Credit [Member] | Variable [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 6,837 7,158
Commitments to Extend Credit to Borrowers [Member] | Standby Letters of Credit [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 410 397
Commitments to Extend Credit to Borrowers [Member] | Standby Letters of Credit [Member] | Variable [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 410 397
Commitments to Extend Credit to Borrowers [Member] | Performance Guarantee [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 6,770 6,913
Commitments to Extend Credit to Borrowers [Member] | Performance Guarantee [Member] | Fixed [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 532 532
Commitments to Extend Credit to Borrowers [Member] | Performance Guarantee [Member] | Variable [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 6,238 6,381
Commitments to Extend Credit Nonborrowers [Member] | Performance Guarantee [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 67 67
Commitments to Extend Credit Nonborrowers [Member] | Performance Guarantee [Member] | Variable [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit $ 67 $ 67