Fair Value of Financial Instruments and Fair Value Measurements - Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets
Cash and short-term investments	$ 95,827	$ 104,092
Investment securities available for sale, at fair value	333,085	347,332
Other investments, at cost	3,891
Other investments, at cost		4,288
Loans held for sale	11,022	10,076
Loans, net	1,003,928	938,475
Liabilities
Deposits	1,293,076	1,294,506
Subordinated debentures	24,229	24,229
Other borrowings	48,465	60,585
Level 1
Assets
Cash and short-term investments	95,827	104,192
Investment securities available for sale, at fair value	0	0
Other investments, at cost	3,162
Other investments, at cost		3,559
Loans held for sale	0	0
Loans, net	0	0
Liabilities
Deposits	0	0
Subordinated debentures	0	0
Other borrowings	0	0
Level 2
Assets
Cash and short-term investments	0	0
Investment securities available for sale, at fair value	331,068	345,310
Other investments, at cost	729
Other investments, at cost		729
Loans held for sale	11,022	10,076
Loans, net	0	0
Liabilities
Deposits	1,293,076	1,294,506
Subordinated debentures	24,229	24,229
Other borrowings	48,465	60,585
Level 3
Assets
Cash and short-term investments	0	0
Investment securities available for sale, at fair value	2,017	2,022
Other investments, at cost	0
Other investments, at cost		0
Loans held for sale	0	0
Loans, net	1,003,928	938,475
Liabilities
Deposits	0	0
Subordinated debentures	0	0
Other borrowings		0
Carrying Value
Assets
Cash and short-term investments	95,827	104,092
Investment securities available for sale, at fair value	333,085	347,332
Other investments, at cost	3,891
Other investments, at cost		4,288
Loans held for sale	11,022	10,076
Loans, net	980,642	961,696
Liabilities
Deposits	1,293,076	1,293,742
Subordinated debentures	24,229	24,229
Other borrowings	$ 51,063	$ 61,563