Fair Value of Assets and Liabilities - Off-Balance Sheet Credit-Related Commitments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Carrying amount
Financial Assets
Cash and cash equivalents	$ 144,006	$ 40,651
Loans	1,697,355	1,679,676
Accrued interest receivable	7,551	7,645
Bank-owned life insurance	31,566	30,763
Financial Liabilities
Noninterest-bearing transaction	577,704	550,640
Interest-bearing transaction	1,197,530	1,053,869
Time deposits	196,082	170,587
Deposits held for sale		24,197
Short-term borrowings		93,460
Long-term debt	58,769	58,824
Accrued interest payable	1,038	1,879
Estimated fair value
Financial Assets
Cash and cash equivalents	144,006	40,651
Loans	1,693,824	1,663,401
Accrued interest receivable	7,551	7,645
Bank-owned life insurance	31,566	30,763
Financial Liabilities
Noninterest-bearing transaction	577,704	550,640
Interest-bearing transaction	1,197,530	1,053,869
Time deposits	196,182	172,616
Deposits held for sale		22,019
Short-term borrowings		93,460
Long-term debt	58,239	59,988
Accrued interest payable	1,038	1,879
Level 1 | Estimated fair value
Financial Assets
Cash and cash equivalents	144,006	40,651
Accrued interest receivable	7,551	7,645
Financial Liabilities
Short-term borrowings		93,460
Accrued interest payable	1,038	1,879
Level 2 | Estimated fair value
Financial Assets
Bank-owned life insurance	31,566	30,763
Financial Liabilities
Noninterest-bearing transaction	577,704	550,640
Interest-bearing transaction	1,197,530	1,053,869
Long-term debt	58,239	59,988
Level 3 | Estimated fair value
Financial Assets
Loans	1,693,824	1,663,401
Financial Liabilities
Time deposits	$ 196,182	172,616
Deposits held for sale		$ 22,019