Borrowings - Summary of Borrowings By Type (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Schedule of Borrowings [Line Items]
Balance at End of Year	$ 105,431	$ 196,171
Balance at End of Year	$ 155,828	$ 127,522
Federal Home Loan Bank Advances [Member]
Schedule of Borrowings [Line Items]
Weighted Average Interest Rate	1.73%	0.94%
Maximum Amount Outstanding at Month End During the Year	$ 190,689	$ 96,471
Average Amount Outstanding During the Year	$ 155,073	$ 45,179
Weighted Average Interest Rate During the Year	1.43%	0.89%
Balance at End of Year	$ 125,036	$ 96,248
Securities Sold under Agreements to Repurchase [Member]
Schedule of Borrowings [Line Items]
Weighted Average Interest Rate	1.52%	0.91%
Maximum Amount Outstanding at Month End During the Year	$ 31,234	$ 31,475
Average Amount Outstanding During the Year	$ 31,036	$ 15,786
Weighted Average Interest Rate During the Year	1.30%	0.93%
Balance at End of Year	$ 30,792	$ 31,274
Subordinated Debt [Member]
Schedule of Borrowings [Line Items]
Weighted Average Interest Rate	5.35%	5.36%
Maximum Amount Outstanding at Month End During the Year	$ 94,331	$ 94,087
Average Amount Outstanding During the Year	$ 94,208	$ 71,851
Weighted Average Interest Rate During the Year	5.35%	5.39%
Balance at End of Year	$ 94,331	$ 94,087
Federal Home Loan Bank Advances [Member]
Schedule of Borrowings [Line Items]
Balance at End of Year	$ 30,225	$ 91,300
Weighted Average Interest Rate	1.54%	0.74%
Maximum Amount Outstanding at Month End During the Year	$ 124,500	$ 206,000
Average Amount Outstanding During the Year	$ 50,063	$ 50,757
Weighted Average Interest Rate During the Year	1.10%	0.58%
Federal Funds Purchased [Member]
Schedule of Borrowings [Line Items]
Balance at End of Year	$ 55,000	$ 80,000
Weighted Average Interest Rate	1.56%	0.81%
Maximum Amount Outstanding at Month End During the Year	$ 95,000	$ 125,000
Average Amount Outstanding During the Year	$ 32,282	$ 24,783
Weighted Average Interest Rate During the Year	1.05%	0.61%
Securities Sold under Agreements to Repurchase [Member]
Schedule of Borrowings [Line Items]
Balance at End of Year	$ 20,206	$ 24,871
Weighted Average Interest Rate	0.05%	0.05%
Maximum Amount Outstanding at Month End During the Year	$ 26,376	$ 30,011
Average Amount Outstanding During the Year	$ 23,207	$ 26,173
Weighted Average Interest Rate During the Year	0.05%	0.05%
Short-term Debt [Member]
Schedule of Borrowings [Line Items]
Balance at End of Year		$ 0
Weighted Average Interest Rate		0.00%
Maximum Amount Outstanding at Month End During the Year		$ 79,960
Average Amount Outstanding During the Year		$ 1,525
Weighted Average Interest Rate During the Year		18.83%