Fair Value of Assets and Liabilities - Off-Balance Sheet Credit-Related Commitments (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Carrying amount
Financial Assets
Cash and cash equivalents	$ 198,489	$ 144,006
Loans	1,731,258	1,697,355
Accrued interest receivable	7,425	7,551
Bank-owned life insurance	31,763	31,566
Financial Liabilities
Noninterest-bearing deposits	608,559	577,704
Interest-bearing deposits	1,311,585	1,197,530
Time deposits	201,370	196,082
Long-term debt	58,762	58,769
Accrued interest payable	1,760	1,038
Estimated fair value
Financial Assets
Cash and cash equivalents	198,489	144,006
Loans	1,761,783	1,693,824
Accrued interest receivable	7,425	7,551
Bank-owned life insurance	31,763	31,566
Financial Liabilities
Noninterest-bearing deposits	608,559	577,704
Interest-bearing deposits	1,311,585	1,197,530
Time deposits	202,892	196,182
Long-term debt	57,941	58,239
Accrued interest payable	1,760	1,038
Level 1 | Estimated fair value
Financial Assets
Cash and cash equivalents	198,489	144,006
Accrued interest receivable	7,425	7,551
Financial Liabilities
Accrued interest payable	1,760	1,038
Level 2 | Estimated fair value
Financial Assets
Bank-owned life insurance	31,763	31,566
Financial Liabilities
Noninterest-bearing deposits	608,559	577,704
Interest-bearing deposits	1,311,585	1,197,530
Long-term debt	57,941	58,239
Level 3 | Estimated fair value
Financial Assets
Loans	1,761,783	1,693,824
Financial Liabilities
Time deposits	$ 202,892	$ 196,182