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Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk - Commitments (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Company's contractual commitments due to letters of credit    
Total letters of credit $ 16,418 $ 16,801
Fixed [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 900 910
Variable [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 15,518 15,891
Commitments to Extend Credit to Borrowers [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 16,351 16,734
Commitments to Extend Credit to Borrowers [Member] | Fixed [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 900 910
Commitments to Extend Credit to Borrowers [Member] | Variable [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 15,451 15,824
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 9,710 9,951
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 329 339
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 9,381 9,612
Commitments to Extend Credit to Borrowers [Member] | Performance Guarantee [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 6,641 6,783
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 571 571
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 6,070 6,212
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
Letter of Credit [Member] | Unused lines of Credit [Member]    
Company's contractual commitments due to letters of credit    
Loan commitments 439,482 431,468
Letter of Credit [Member] | Unused lines of Credit [Member] | Fixed [Member]    
Company's contractual commitments due to letters of credit    
Loan commitments 112,537 111,348
Letter of Credit [Member] | Unused lines of Credit [Member] | Variable [Member]    
Company's contractual commitments due to letters of credit    
Loan commitments $ 326,945 $ 320,120