Fair Value of Financial Instruments - Carrying and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Financial Assets:
Equity securities, at fair value		$ 2,320	$ 0	[1]
Securities available for sale, at fair value		310,348
Securities available for sale, at fair value	[1]		321,337
Financial Liabilities:
Other short-term borrowings		0	24,000	[1]
Level 1
Financial Assets:
Cash and cash equivalents		76,653	52,477
Securities available for sale, at fair value		0
Securities available for sale, at fair value			0
Restricted stock		0	0
Loans held for sale		0	0
Loans, net of allowance		0	0
Bank owned life insurance		0	0
Accrued interest receivable		0	0
Financial Liabilities:
Deposits		0	0
Repurchase agreements		0	0
Junior subordinated debt		0	0
Accrued interest payable		0	0
Level 1 | Other short-term borrowings
Financial Liabilities:
Other short-term borrowings			0
Level 2
Financial Assets:
Cash and cash equivalents		0	0
Equity securities, at fair value		2,320
Securities available for sale, at fair value		310,348
Securities available for sale, at fair value			321,337
Restricted stock		5,221	6,110
Loans held for sale		1,792	1,639
Loans, net of allowance		0	0
Bank owned life insurance		18,566	18,460
Accrued interest receivable		4,945	5,231
Financial Liabilities:
Deposits		1,566,012	1,527,956
Repurchase agreements		10,466	10,726
Junior subordinated debt		0	0
Accrued interest payable		698	674
Level 2 | Other short-term borrowings
Financial Liabilities:
Other short-term borrowings			24,000
Level 3
Financial Assets:
Cash and cash equivalents		0	0
Securities available for sale, at fair value		0
Securities available for sale, at fair value			0
Restricted stock		0	0
Loans held for sale		0	0
Loans, net of allowance		1,305,037	1,317,737
Bank owned life insurance		0	0
Accrued interest receivable		0	0
Financial Liabilities:
Deposits		0	0
Repurchase agreements		0	0
Junior subordinated debt		21,801	28,358
Accrued interest payable		0	0
Level 3 | Other short-term borrowings
Financial Liabilities:
Other short-term borrowings			0
Carrying Value
Financial Assets:
Cash and cash equivalents		76,653	52,477
Equity securities, at fair value		2,320
Securities available for sale, at fair value		310,348
Securities available for sale, at fair value			321,337
Restricted stock		5,221	6,110
Loans held for sale		1,792	1,639
Loans, net of allowance		1,307,646	1,322,522
Bank owned life insurance		18,566	18,460
Accrued interest receivable		4,945	5,231
Financial Liabilities:
Deposits		1,559,251	1,534,726
Repurchase agreements		10,466	10,726
Junior subordinated debt		27,851	27,826
Accrued interest payable		698	674
Carrying Value | Other short-term borrowings
Financial Liabilities:
Other short-term borrowings			24,000
Fair Value
Financial Assets:
Cash and cash equivalents		76,653	52,477
Equity securities, at fair value		2,320
Securities available for sale, at fair value		310,348
Securities available for sale, at fair value			321,337
Restricted stock		5,221	6,110
Loans held for sale		1,792	1,639
Loans, net of allowance		1,305,037	1,317,737
Bank owned life insurance		18,566	18,460
Accrued interest receivable		4,945	5,231
Financial Liabilities:
Deposits		1,566,012	1,527,956
Repurchase agreements		10,466	10,726
Junior subordinated debt		21,801	28,358
Accrued interest payable		$ 698	674
Fair Value | Other short-term borrowings
Financial Liabilities:
Other short-term borrowings			$ 24,000

[1] Derived from audited consolidated financial statements.